[Botany • 2026] Thismia daemona (Thismiaceae) • A New Species of Thismia sect. Geomitra from Thailand supported by morphological and molecular evidence

 

Thismia daemona Seelanan & Chantanaorr.,

in Seelanan, Chantapram, Taosiri, Chuchuea et Chantanaorrapint, 2026.

 DOI: doi.org/10.3897/phytokeys.278.202868

Abstract

A new species of Thismia from Thailand, Thismia daemona is described based on morphological characters and molecular phylogenetic analyses. Morphological characters were examined from fresh and spirit materials using a stereo microscope. Phylogenetic analyses were conducted based on three nuclear (SSU, ITS, LSU) and two mitochondrial (atpA, matR) markers. The new species is characterized by coralliform roots, blackish flowers, reddish orange and fleshy outer tepals, inner tepals forming a mitre with three slender claviform appendages, inner surface of floral tube possessing irregular transverse bars in lower half and finely reticulations in upper half, epidermis of transverse bars and reticulations covered with white translucent trichomes, and translucent blue stamens with recurved apex. Phylogenetic analyses support its placement within Thismia sect. Geomitra, with a sister relationship to T. betung-kerihunensis. In addition, the new species is assessed as Critically Endangered according to the IUCN Red List categories and criteria.

Key words: Achlorophyllous plants, conservation status, coralliform root, endemic species

Thismia daemona Seelanan & Chantanaorr.
A. Underground part showing hairy roots; B. Above-ground shoots with flowers; C. Top view of mitre showing irregular papillose surface; D. Side view of flower showing outer lobe; E. Longitudinal section of floral tube showing inner surface, three stamens, stylar column and styles; F. Epidermal cells of transversal bar; G. Stamens outer view. H. Stylar column and styles.

Photographed by N. Taosiri (B, C, E, G, H) and C. Chuchuea (A, D, F).

Locality and habitats of Thismia daemona Seelanan & Chantanaorr.
A. Distribution map; B–D. Habitats; arrowheads indicate plants of T. daemona; E. Plants in natural habitat. Photographed by C. Chuchuea (B–D) and N. Taosiri (E).

Thismia daemona Seelanan & Chantanaorr., sp. nov.

Diagnosis. Thismia daemona is somewhat similar morphologically to T. limkokthayi, but differs in having reddish orange and fleshy outer tepals, outer surface of mitre covered with irregular papillae, inner surface of floral tube possessing irregular transverse bars in lower half and finely reticulations in upper half, epidermis of transverse bars and reticulations covered with translucent white trichomes, translucent blue stamens, and absence of mitre foveae.

Habitat and ecology. Thismia daemona was found growing amongst leaf litter, under shade of lower montane forest with small bamboo, at elevations 950–970 m.

 Tosak Seelanan, Isareyakorn Chantapram, Neeranuch Taosiri, Chanachon Chuchuea and Sahut Chantanaorrapint. 2026. Thismia daemona (Thismiaceae), A New Species from Thailand supported by morphological and molecular evidence. PhytoKeys. 278: 177-189. DOI: doi.org/10.3897/phytokeys.278.202868 [17-08-2026]

[Diplopoda • 2026] Enghoffosoma chiangmaiense, E. minutum, E. chanabunae • Integrative Taxonomy of the Millipede Genus Enghoffosoma Golovatch, 1993 (Polydesmida: Paradoxosomatidae) in Thailand and Myanmar, with Descriptions of Three New Species

Enghoffosoma chiangmaiense Srisonchai & Likhitrakarn; 
E. minutum Srisonchai & Likhitrakarn; 
 E. chanabunae Srisonchai & Likhitrakarn, 
 

 in Srisonchai, Benchapong, Golovatch, Sutcharit, Panha et Likhitrakarn, 2026. 

DOI: doi.org/10.37828/em.2026.99.4 

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Abstract

Although comprehensive studies on the Southeast Asian flat-backed millipede genus Enghoffosoma Golovatch, 1993 in Thailand have begun quite recently, in 2014, continuous field surveys have since revealed a steadily increasing species diversity. Based on extensive new material collected from Thailand and Myanmar, three new species are described using an integrative taxonomic approach that combines morphological characters and mitochondrial COI DNA barcoding: Enghoffosoma chiangmaiense Srisonchai & Likhitrakarn sp. n. from northern Thailand, Enghoffosoma minutum Srisonchai & Likhitrakarn sp. n. from northeastern Thailand, and Enghoffosoma chanabunae Srisonchai & Likhitrakarn sp. n. from the Tanintharyi Region, southern Myanmar. COI sequence comparisons, available for E. chanabunae Srisonchai & Likhitrakarn sp. n. and E. chiangmaiense Srisonchai & Likhitrakarn sp. n., reveal significant interspecific genetic divergences (K2P distances) from their congeners, ranging from 13.53–16.75% and 13.53–18.14%, respectively. While DNA data were unavailable for E. minutum Srisonchai & Likhitrakarn sp. n., its distinctive morphological characters, particularly the gonopod structure, clearly support its status as a new species. To provide a clear morphological baseline for comparison, the type species, Enghoffosoma spinipleurum (Carl, 1941), from Myanmar, originally described as Sundanina spinipleura Carl, 1941, is redescribed and illustrated in detail based on the lectotype. With these additions, the genus Enghoffosoma now comprises 21 valid species, confirming its status as a highly diverse and widespread diplopod lineage in the Indochinese region. An updated identification key to all known species and a distribution map are provided.

Enghoffosoma chiangmaiense Srisonchai & Likhitrakarn sp. n. 

 Enghoffosoma minutum Srisonchai & Likhitrakarn sp. n. 

 Enghoffosoma chanabunae Srisonchai & Likhitrakarn sp. n. 

Ruttapon Srisonchai, Theemaporn Benchapong, Sergei I. Golovatch, Chirasak Sutcharit, Somsak Panha, Natdanai Likhitrakarn. 2026. Integrative Taxonomy of the Millipede Genus Enghoffosoma Golovatch, 1993 (Diplopoda, Polydesmida, Paradoxosomatidae) in Thailand and Myanmar, with Descriptions of Three New Species. Ecologica Montenegrina. 99; 40-71. DOI: doi.org/10.37828/em.2026.99.4 [2026-06-24] 

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[Botany • 2026] Asplenium paucipinnatum (Aspleniaceae) • A New fern Species from southern Thailand, based on morphological and molecular data

Asplenium paucipinnatum  K.W.Xu, Li Bing Zhang & Pollawatn, 

in Xu, Pollawatn, L. Zhang, Zhou et L.-B. Zhang, 2026.   

DOI: doi.org/10.3897/phytokeys.272.173645

Abstract

Asplenium paucipinnatum, a new fern species from Nakhon Si Thammarat, Thailand, is described. Morphologically, it closely resembles A. micantifrons in having short-creeping and radial rhizome steles, 1-pinnate laminae, deeply incised pinnae on the basiscopic margin, and sori arranged in two rows close to the costae. However, A. paucipinnatum is readily distinguished by having fewer lateral pinnae (< 14 pairs), obliquely rhombic pinnae with acute apices and obtuse marginal teeth, contrasting the more numerous pinnae (> 15 pairs), lanceolate pinnae with acuminate apices, and acute teeth in A. micantifrons. Phylogenetic analyses based on multiple plastid DNA regions (atpB, rbcL, rps4, rps4-trnS, trnL, and trnL-F) support A. paucipinnatum as a distinct lineage, forming a sister relationship with a clade containing A. lepturus and A. contiguum. The combination of morphological and molecular evidence supports the recognition of this new taxon. Ecological notes, geographic distribution, and a comparison with related species are also provided.

Key words: Asplenium aethiopicum clade, fern phylogeny, Southeast Asian fern flora, taxonomy

Asplenium paucipinnatum. A. Habit; B. Abaxial view of lamina; C. Abaxial view of pinnae showing the venation on the pinnae; D. Showing the lamina apices deeply pinnatifid and becoming gradually decrescent upwards; E. Adaxial view of Pinnae at middle portion of the laminae; F. Short-creeping rhizome; G. Rhizome scales.

(Voucher specimen: Li Bing Zhang, Liang Zhang, R. Pollawatn & X. M. Zhou 10976).

Asplenium paucipinnatum K.W.Xu, Li Bing Zhang & Pollawatn, sp. nov.

 

Description. Asplenium paucipinnatum resembles A. micantifrons (Tuyama) Tuyama ex H.Ohba by its short creeping and radial rhizomes, 1-pinnate laminae, pinnae deeply incised at basiscopic side of margin, and sori borne in 2 rows closely set along to the costa, but the former has lateral pinnae fewer than 14 pairs, pinnae oblique rhombic, pinna apex acute, and marginal teeth obtuse. In contrast, A. micantifrons has lateral pinnae more than 15 pairs, pinnae lanceolate, pinna apex acuminate, and marginal teeth acute.

Ke-Wang Xu, Rossarin Pollawatn, Liang Zhang, Xin-Mao Zhou and Li-Bing Zhang. 2026. Asplenium paucipinnatum (Aspleniaceae), A New fern Species from southern Thailand, based on morphological and molecular data. PhytoKeys. 272: 159-167. DOI: doi.org/10.3897/phytokeys.272.173645 [02 Apr 2026]

[Mollusca • 2025] Chamalycaeus aduncus • The First Record of an Operculate Micro Land Snail from the Alycaeinae (Caenogastropoda: Cyclophoridae) in Cambodia

 

Chamalycaeus aduncus Jirapatrasilp,   

in Jirapatrasilp, Thi, Chantha, Chourn, Sophea, Jeratthitikul, Pholyotha, Siriwut, Srisonchai, Panha et Sutcharit, 2025. 

www.ruthenica.net/node/6016

 Researchgate.net/publication/390396808 

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This study reports the first record of the operculate micro land snail from the Alycaeinae, Chamalycaeus aduncus Jirapatrasilp sp. nov., also the first new species of the genus in Cambodia, based on a recent survey in Battambang. This new species is similar to Chamalycaeus excisus (Möllendorff, 1887) and C. excisus sublimus Páll-Gergely et Auffenberg, 2019 from the Philippines, in shell size and shape, and the strongly downwards coiling of R3, but differs in having a shorter R2 without any blunt keel, a round aperture without any incision, and a beak- or hook-like basal edge of the outer peristome. 

Keywords: Battambang; Cyclophoroidea; Gastropoda; Mollusca; taxonomy

Chamalycaeus aduncus sp. nov.
A paratype CUMZ 14462/1, and B paratype CUMZ 14462/2, showing a scraping hole at the umbilical side.

. Representative SEM images of Chamalycaeus aduncus sp. nov., holotype CUMZ 14461
 A whole shell in different positions, and B Close-up images of the aperture; white arrows pointing to the beak- or hook-like basal edge of the outer peristome.

Chamalycaeus aduncus Jirapatrasilp sp. nov.

 

Parin JIRAPATRASILP, Sothearen THI, Nasak CHANTHA, Phyroum CHOURN, Chhin SOPHEA, Ekgachai JERATTHITIKUL, Arthit PHOLYOTHA, Warut SIRIWUT, Ruttapon SRISONCHAI, Somsak PANHA and Chirasak SUTCHARIT. 2025. The First Record of an Operculate Micro Land Snail from the Alycaeinae (Caenogastropoda, Cyclophoridae) in Cambodia, with Description of A New Species of Chamalycaeus von Möllendorff, 1897. Ruthenica Russian Malacological Journal. 35(2); 65-72. https://www.ruthenica.net/node/6016

 Researchgate.net/publication/390396808_The_first_record_of_an_operculate_micro_land_snail_from_the_Alycaeinae_Cyclophoridae_in_Cambodia

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[Diplopoda • 2026] Rhopalomeris dulcia, R. lentiginosa, R. verhoeffi, ... • Five New Species of the Pill Millipede Genus Rhopalomeris Verhoeff, 1906 (Glomerida: Glomeridae) from Thailand

Rhopalomeris dulcia, 
R. verhoeffi  

Sapparojpattana & Likhitrakarn,

in Sapparojpattana, Jeratthitikul, Siriwut, Srisonchai, Wesener, Sutcharit et Likhitrakarn, 2026.  

DOI: doi.org/10.1163/18759866-bja10090 

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Abstract

An integrative approach based on morphological characteristics and DNA data from the mitochondrial COI gene has revealed five new species of the pill millipede genus Rhopalomeris Verhoeff, 1906 from Thailand: Rhopalomeris muka Sapparojpattana & Likhitrakarn, sp. nov., R. lentiginosa Sapparojpattana & Likhitrakarn, sp. nov., R. dulcia Sapparojpattana & Likhitrakarn, sp. nov., R. punctata Sapparojpattana & Likhitrakarn, sp. nov., and R. verhoeffi Sapparojpattana & Likhitrakarn, sp. nov. The five new species are distinguishable from their congeners by distinctive color patterns and telopod structure. The interspecific genetic divergences between the new species and other Rhopalomeris species ranged from 7.86 to 13.71%. Intraspecific genetic divergences within these five species ranged from 0 to 4.53%, with the highest divergences found in R. carnifex and R. verhoeffi sp. nov. This is consistent with both the wide distribution range and the significant intraspecific morphological variations observed in these latter two species. Furthermore, the taxonomic scope of R. carnifex in Thailand is reviewed, and intraspecific morphological variations within R. carnifex and R. verhoeffi sp. nov. are discussed. A distribution map, morphological illustrations from SEM, and an updated key to all known Rhopalomeris species are also provided.

Keywords: DNA barcoding; Indochina; integrative taxonomy; phylogeny; systematics

Rhopalomeris dulcia sp. nov., (A, B) paratype (MUMNH-GLO188), habitus, live coloration (C–E) ♀ paratype (MUMNH-GLO188), alcohol preserved, in dorsal, ventral, and lateral views (A) unrolled in sublateral view (B) rolled in sublateral view.

(A, B) image not to scale (C–E) scale bars: 2 mm

Rhopalomeris verhoeffi sp. nov., (A, B) paratype (MUMNH-GLO201), habitus, live coloration of color morph 2 (C–E) ♀ paratype (MUMNH-GLO201), alcohol preserved specimen of color morph 2 in dorsal, ventral, and lateral views (A) unrolled in sublateral view (B) rolled in sublateral view.

(A, B) image not to scale (C–E) scale bars: 2 mm

 Rhopalomeris muka Sapparojpattana & Likhitrakarn, sp. nov.

R. lentiginosa Sapparojpattana & Likhitrakarn, sp. nov. 

 R. dulcia Sapparojpattana & Likhitrakarn, sp. nov. 

 R. punctata Sapparojpattana & Likhitrakarn, sp. nov. 

 R. verhoeffi Sapparojpattana & Likhitrakarn, sp. nov. 

Distributions of currently known Rhopalomeris species in Thailand and Myanmar

(A) Bayesian inference tree focusing on the detailed topology of Rhopalomeris carnifex (Pocock, 1889) and R. verhoeffi sp. nov., with colored drawings illustrating the color variations within each species. All millipede drawings are not to scale.
(B, C) Maps of southern Thailand showing the distributions of color morphs for (B) R. carnifex and (C) R. verhoeffi sp. nov. The different shaded colors in each pie chart represent the proportion of the corresponding color morphs in that locality.

 Pichsinee Sapparojpattana, Ekgachai Jeratthitikul, Warut Siriwut, Ruttapon Srisonchai, Thomas Wesener, Chirasak Sutcharit, and Natdanai Likhitrakarn. 2026. Five New Species of the Pill Millipede Genus Rhopalomeris Verhoeff, 1906 (Diplopoda, Glomerida) from Thailand. Contributions to Zoology. 95(1); 52–102. DOI: doi.org/10.1163/18759866-bja10090 [20 Feb 2026]

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***งานวิจัยใหม่: กิ้งกือกระสุนลูกกวาด 5 ชนิดใหม่ของโลกจากประเทศไทย
และการมีรูปแบบสีที่หลากหลายซึ่งพบในบางชนิด***

...

รายชื่อชนิดใหม่ดังนี้

.

1. 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨 𝙢𝙪𝙠𝙖 Sapparojpattana & Likhitrakarn, 2026
กิ้งกือกระสุนลูกกวาดมหิดลกาญจน์
 ค้นพบที่ มหาวิทยาลัยมหิดล วิทยาเขตกาญจนบุรี อำเภอไทรโยค จังหวัดกาญจนบุรี

2. 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨 𝙡𝙚𝙣𝙩𝙞𝙜𝙞𝙣𝙤𝙨𝙖 Sapparojpattana & Likhitrakarn, 2026
ค้นพบที่ ตำบลท่าขนุน อำเภอทองผาภูมิ จังหวัดกาญจนบุรี

3. 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨 𝙙𝙪𝙡𝙘𝙞𝙖 Sapparojpattana & Likhitrakarn, 2026
ค้นพบที่ ตำบลบ้านนา อำเภอเมืองชุมพร จังหวัดชุมพร

4. 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨 𝙥𝙪𝙣𝙘𝙩𝙖𝙩𝙖 Sapparojpattana & Likhitrakarn, 2026
ค้นพบที่ ตำบลไร่เก่า อำเภอสามร้อยยอด จังหวัดประจวบคีรีขันธ์

5. 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨 𝙫𝙚𝙧𝙝𝙤𝙚𝙛𝙛𝙞 Sapparojpattana & Likhitrakarn, 2026
ตั้งชื่อเป็นเกียรติแก่ Karl Wilhelm Verhoeff ผู้ตั้งสกุลกื้งกือกระสุนลูกกวาด 𝙍𝙝𝙤𝙥𝙖𝙡𝙤𝙢𝙚𝙧𝙞𝙨
ค้นพบครั้งแรกที่ น้ำตกกะทู้ อำเภอกะทู้ จังหวัดภูเก็ต และกระจายตัวหลายพื้นที่ในภาคใต้ของประเทศไทย 

[Crustacea • 2024] Caridina maeklongensis • A New landlocked freshwater Shrimp Species (Decapoda: Atyidae) from the Mae Klong Basin, Thailand

[A–D] Caridina maeklongensis  

   Macharoenboon, Manonai & Jeratthitikul. 2024

[E, F] C. sumatrensis  De Man, 1892

RAFFLES BULLETIN OF ZOOLOGY. 72

Abstract. A newly discovered landlocked shrimp, Caridina maeklongensis, new species, is described from the Mae Klong Basin, western Thailand. The morphology of the new species resembles C. sumatrensis, from which it differs in possessing a shorter rostrum with fewer dorsal teeth, a small number of very large-sized eggs, and a greatly reduced posteromedian projection on the distal end of the telson. The molecular evidence of the mitochondrial 16S rRNA gene also supports the species status of the newly described species. This is the fifth endemic species of Caridina known from Thailand. 

Key words. crustacean, landlocked freshwater shrimp, molecular phylogeny, taxonomy, Southeast Asia

Living habitus specimens of Caridina species from the Mae Klong Basin.
A–D, Caridina maeklongensis, new species: A, paratype male, MUMNH-CAR064-4; B, paratype female, MUMNH-CAR064-1; C, paratype female, MUMNH-CAR064-15; and D, paratype female, MUMNH-CAR064-13.
 E, F, C. sumatrensis: E, male, MUMNH-CAR706-P2; and F, female, MUMNH-CAR706-P1.

Family Atyidae De Haan, 1849 

Genus Caridina H. Milne Edwards, 1837 

Caridina maeklongensis, new species

Etymology. The specific name is from its type locality, the Mae Klong Basin.

Kongkit Macharoenboon, Varitsara Manonai and Ekgachai Jeratthitikul. 2024. Caridina maeklongensis, A New landlocked freshwater Shrimp Species (Crustacea: Decapoda: Atyidae) from the Mae Klong Basin, Thailand. RAFFLES BULLETIN OF ZOOLOGY. 72: 450–468.

[Mollusca • 2021] Hemiplecta nemorosa • Systematic Review of the Dextral Hemiplecta Albers, 1850 (Eupulmonata: Ariophantidae) from Thailand with Description of A New Species and List of All the Indochinese Species

A Hemiplecta humphreysiana from Singapore; B Hemiplecta distincta from Saraburi, Thailand;
D, E Hemiplecta funerea from Nan, Thailand D yellow shell form and E dark shell form;
  F Hemiplecta esculenta from Chiang Mai, Thailand; 

Hemiplecta nemorosa  Sutcharit & Panha, 2021

DOI: 10.3897/zookeys.1047.65735

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Abstract

The genus Hemiplecta is a group of large-sized land snails which have long been used as a food resource by Indochinese people. There are five dextral and four sinistral species currently recognized from Thailand. The dextral group is comprised of two previously recorded species (H. humphreysiana and H. distincta), two newly recorded species (H. funerea and H. esculenta), and one new species (Hemiplecta nemorosa sp. nov.) from northern Thailand is being proposed. We reassessed the diagnostic characters of the genitalia, mantle edge, and radula. Specimens were classified into the genus Hemiplecta on the basis of the penial verge and shell lobe, and on the characters of a bulbous gametolytic sac without a gametolytic duct. A complete species list, together with photographs of the name-bearing types or authenticated specimens and the taxonomic status of Hemiplecta s.l. that are known from Indochina including Peninsular Malaysia and Myanmar, is provided for the first time. In total, this species list contains 39 available nominal species names described from this area. Type or authentic specimens can be located for 37 nominal species names, of which 25 are illustrated herein and the other 12 were recently illustrated. However, two available species-level names could not be traced to any type specimens. In addition, lectotypes of H. funerea and H. pluto are designated herein to stabilize the names.

Keywords: Conservation, edible snails, lectotype, Southeast Asia, taxonomy type specimen

Living snail.
A Hemiplecta humphreysiana from Singapore (width about 45 mm)
B, C Hemiplecta distincta B from Saraburi, Thailand (width about 65 mm) and C mating pairs
D, E Hemiplecta funerea from Nan, Thailand (width about 50 mm) D yellow shell form and E dark shell form (width about 50 mm)  
F Hemiplecta esculenta from Chiang Mai, Thailand (width about 30 mm).

 Chirasak Sutcharit and Somsak Panha. 2021. Systematic Review of the Dextral Hemiplecta Albers, 1850 (Eupulmonata, Ariophantidae) from Thailand with Description of A New Species and List of All the Indochinese Species. ZooKeys. 1047: 101-154. DOI: 10.3897/zookeys.1047.65735

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[Invertebrate • 2025] Amynthas septuaginta & Metaphire fidelis • Two New Earthworm Species (Oligochaeta: Megascolecidae) from the Mekong River, Thailand

Amynthas septuaginta  Bantaowong & Panha,

in Bantaowong, Chanabun, Nantarat et Panha, 2025. 

  Tropical Natural History. Suppl. 8; 

ไส้เดือนริมโขงบึงกาฬ  ||  DOI: doi.org/10.58837/tnh.25.8.267154 

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Abstract

Two new earthworm species are described from the Mekong River, Thailand, namely Amynthas septuaginta Bantaowong & Panha, sp. nov. and Metaphire fidelis Bantaowong & Panha, sp. nov. The former is a small Mekong earthworm in the A. aeruginosus species group with two pairs of spermathecal pores in 7/8-8/9. It is mainly distinguished from other Amynthas from the Mekong River by its small size (less than 50 mm), and with no genital markings at the male pore region. The latter is distinguished by having four pairs of spermathecal pores in 5/6-8/9, genital markings paired on xvii, ampulla paddle-shaped, and with diverticulum as a slender tube with a loose loop. Morphological description, taxonomic comments, illustrations, and distribution are provided.

Keywords: Amynthas, Metaphire, taxonomy, Mekong River

External and internal morphology of holotype (CUMZ3831) of Amynthas septuaginta sp. nov.,
A. external ventral view; B. internal dorsal view; C. spermathecae. Dark arrow indicates the connection of the spermathecae and spermathecal pore.

 Amynthas septuaginta Bantaowong & Panha, sp. nov. 

ไส้เดือนริมโขงบึงกาฬ

Metaphire fidelis Bantaowong & Panha, sp. nov.

 ไส้เดือนภักดีแม่น้ำโขง

Ueangfa Bantaowong, Ratmanee Chanabun, Nattawadee Nantarat and Somsak Panha. 2025. Description of Two New Earthworm Species (Oligochaeta: Megascolecidae) from the Mekong River, Thailand.  Tropical Natural History. Suppl. 8; 305-312. DOI: doi.org/10.58837/tnh.25.8.267154  [2025-10-20]

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[Diplopoda • 2025] Yuennanina sirindhornae • Review of the Flat Back Millipede Genus Yuennanina Attems, 1936 (Polydesmida: Paradoxosomatidae), with the Description of a New Species from Thailand

 

Yuennanina sirindhornae 

Likhitrakarn, Golovatch & Panha, 2025

กิ้งกือตะเข็บเจ้าฟ้า  ||  DOI: doi.org/10.58837/tnh.25.8.266228

Abstract

The millipede genus Yuennanina Attems, 1936 has been known so far only from Yunnan Province, southwestern China. Currently, it comprises three species: Y. ceratogaster Attems, 1936, Y. aceratogaster Zhang & Li, 1977, and Y. petalolobodes Chang & Zhang, 1989. Herein, we describe Yuennanina sirindhornae sp. nov., from Huai Nam Dang, Chiang Mai Province, northern Thailand, representing the first formal record of this genus not only from Thailand, but also from entire Southeast Asia. The new species is characterized by its unique gonopodal solenophore the shape of which resembles a young fern frond with fimbriate edges. A detailed redescription of the type species, Y. ceratogaster, is provided based on a revision of type material. An updated identification key to all four presently known Yuennanina species is also provided.

Keywords: arthropod, taxonomy, key

Yuennanina sirindhornae sp. nov., ♂ holotype.
A, B.habitus, live coloration

Yuennanina sirindhornae sp. nov.

Natdanai Likhitrakarn, Sergei Golovatch and Somsak Panha. 2025. Review of the Flat Back Millipede Genus Yuennanina Attems, 1936 (Polydesmida: Paradoxosomatidae), with the Description of a New Species from Thailand. Tropical Natural History. Supplement 8 (2025); 13-23. DOI: doi.org/10.58837/tnh.25.8.266228 [2025-10-14]

 

[Crustacea • 2025] Macrobrachium debaratae • Morphology and Molecular Phylogeny of A New Species of the Genus Macrobrachium (Caridea: Palaemonidae) from Songkhram River, Northeast Thailand

Macrobrachium debaratae Siriwut, 

in Siriwut, Chaowvieng, Jeratthitikul, Chanabun, Panha et Sutcharit, 2025. 

Tropical Natural History. Suppl. 8; 

กุ้งเทพรัตน์  ||  https://li01.tci-thaijo.org/index.php/TNH 

Abstract

The recognized diversity of Macrobrachium prawns in Thailand has increased recently due to taxono-mic investigation using integrative approaches, i.e. from morphology and DNA barcoding. The freshwater habitats in northeast Thailand such as riparian wetland ecosystems provide diverse ecological conditions that promote adaptive diversification among organisms. The varying condition of the freshwater bodies can support the existence of cryptic species among the aquatic animal fauna, including in prawns of the genus Macrobrachium. Several Macrobrachium species have previously been reported in association with the vast network of tributaries that form the Mekong River basin. Newly described species and unidentified morphospecies have particularly been reported from this area in previous systematic studies, which indicates that the current known diversity of the aquatic fauna is likely to be largely incomplete. In this study, a new species of the genus Macrobrachium from the Songkhram River, one of the Mekong tributaries, is described and named as Macrobrachium debaratae Siriwut, sp. nov. This new species contains several distinct morphological characters from its congeneric and co-existing species group, such as the rostral teeth formula, the size and the shape of second pereiopods, and the tooth present on the cutting edge of the fingers of the chelae of the second pereiopods. Genetic distance analysis among the known Macrobrachium species supported this morphological classification as a new species with an interspecific COI divergence of 13%. The COI phylogenetic tree indicated that M. debaratae Siriwut, sp. nov. was monophyletic and was placed close to M. sirindhorn, a member within the M. pilimanus species group. This study highlights the need for a detailed morphological inspection to examine the variability in the taxonomic characters of Macrobrachium, particularly in the M. pilimanus species group found in mainland Southeast Asia tributaries. Further taxonomic review based on intensive sampling is required to provide a more adequate understanding of the diversity of Macrobrachium in the Mekong basin.

 

Keywords: Macrobrachium, Thailand, Songkhram River, New species, COI barcode

Morphological characteristics and chromatophore pattern variation in Macrobrachium debaratae sp. nov.
 A, B, D, E.Colouration and morphology of male specimens. C.Colouration and morphology of female specimen. Scale bar indicates 5 mm.

Macrobrachium debaratae Siriwut, sp. nov. 

Etymology.–The specific name “debaratae”derives from “Debaratana”, which means the insignia gem of goddess.The name is given in honor of Her Royal Highness Princess Maha Chakri Sirindhorn as a token of recognition. Her Royal Highness has been devoted to supporting and kindly participating in several pioneer projects studying Thai biodiversity and conservation led by government and private sectors.

Habitat of Macrobrachium debaratae sp. nov.  
A. Location of type locality. B.Aquatic plant (Potamogeton crispus L.) found dominantly in type locality. C, D. Habitat characteristics of middle Songkhram River.

Warut Siriwut, Apisara Chaowvieng, Ekgachai Jeratthitikul, Ratmanee Chanabun, Somsak Panha and Chirasak Sutcharit. 2025. Morphology and Molecular Phylogeny of A New Species, Macrobrachium debaratae sp. nov. (Caridea, Palaemonidae) from Songkhram River, Northeast Thailand. Tropical Natural History. Suppl. 8;  493-511. 

https://li01.tci-thaijo.org/index.php/tnh/article/view/268420

[Crustacea • 2025] Caridina sirindhornae • A New landlocked atyid Species (Decapoda: Atyidae) from the Middle Mekong Basin, Thailand

 

Caridina sirindhornae

Macharoenboon, Sutcharit, Siriwut & Jeratthitikul, 2025

กุ้งแคระน้ำจืดเจ้าฟ้า  ||  DOI: doi.org/10.58837/tnh.25.8.267352  

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Abstract

A new species of landlocked and geographically restricted freshwater shrimp, Caridina sirindhornae sp. nov., is described from tributaries of the Mekong River in northeastern Thailand. The new species is morphologically similar to C. sumatrensis and C. maeklongensis by sharing characteristics such as a short antennular peduncle, the presence of epipods on the first four pereiopods, similar appendix interna on the male first pleopod, and a prominent subtriangular preanal carina without a spine. However, they can be distinguished by characteristics of the rostrum and egg size. Phylogenetic analyses based on partial sequences of the mitochondrial 16S rRNA and cytochrome oxidase subunit I (COI) genes (540 bp and 1,242 bp, respectively) robustly support the distinctiveness of C. sirindhornae sp. nov. Additionally, the findings show that the new species shares a sister relationship with C. lanceifrons, with a significant 16S rRNA p-distance of 6.74%, remarkably exceeding established species delimitation thresholds within the genus Caridina. This discovery represents the second landlocked Caridina species endemic to the Middle Mekong Basin in Thailand

Keywords: Crustacean, Indochina, molecular phylogeny, taxonomy, Southeast Asia mainland

Living female of Caridina sirindhornae sp. nov.
A. holotype MUMNH-CAR683-H. B. paratype MUMNH-CAR683-F4.

Scale bar = 2 mm.

Caridina sirindhornae sp. nov.

Etymology.–The specific epithet of the new species is in honor of H.R.H. Princess Maha Chakri Sirindhorn on the occasion of her 70th Birthday Anniversary and in recognition of her dedication and significant contributions to scientific and environmental pursuits.

Kongkit Macharoenboon, Chirasak Sutcharit, Warut Siriwut and Ekgachai Jeratthitikul. 2025. Caridina sirindhornae sp. nov., A New landlocked atyid Species (Decapoda: Atyidae) from the Middle Mekong Basin, Thailand. Tropical Natural History. Supplement 8 (2025); 203-219. DOI: doi.org/10.58837/tnh.25.8.267352  [2025-10-14] 

Caridina sirindhornae Macharoenboon et al., 2025  กุ้งแคระน้ำจืดเจ้าฟ้า 

กุ้งขนาดเล็ก มีสีสันสวยงาม พบสองรูปแบบสี รูปแบบแรกลำตัวมีสีดำอมน้ำตาลเข้ม รูปแบบที่สองมีสีส้ม ทั้งสองรูปแบบมีเส้นสีเหลืองทองพาดผ่านด้านบนลำตัว กรีมีสีเหลืองทอง มีสันอยู่บริเวณฐาน องศาหักลงเล็กน้อย ไข่มีสีน้ำตาล ขนาดไข่ปานกลาง เป็นกุ้งถิ่นเดียว
พบบริเวณที่ราบสูงโคราชในลุ่มแม่น้ำโขงตอนกลาง ในบริเวณประเทศไทยเท่านั้น 

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[Mollusca • 2022] Pseudopomatias doiangkhangensis, Pupina bilabiata, Pupina latisulci, ... • Annotated Checklist of the Operculated Land Snails from Thailand (Gastropoda: Caenogastropoda): the Family Pupinidae, with Descriptions of several New Species and Subspecies, and Notes on Classification of Pupina Vignard, 1829 and Pupinella Gray, 1850 from mainland Southeast Asia

 

  [A] Pupina artata from Ratchaburi;
[D, E] Pupina bensoni Jirapatrasilp, sp. nov. from Uthai Thani; 

H Pupina siamensis, Chonburi. 

[A] Pupina siamensis from Rayong;
[B–D] Pupina bilabiata Jirapatrasilp, sp. nov. from Chumphon, Nong Bua Lam Phu and Surat Thani;

[E, F] Pupina godwinausteni Jirapatrasilp, sp. nov.  from Uthai Thani;

[G, H] Pupina aureola: from Nakhon Sri Thammarat. 

in Jirapatrasilp, Sutcharit et Panha, 2022.

DOI: 10.3897/zookeys.1119.85400 

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Abstract 

Thailand is located at the crossroads of several biogeographical regions, and boasts a high level of biodiversity, especially among the malacofauna. The most recent checklist of land snail species in Thailand was compiled more than twenty years ago, and so this checklist needs revision and the addition of newly discovered taxa. This study updates the taxonomy and species list of the operculated land snail family Pupinidae from Thailand. This snail family is diverse and abundant, and can be found in various natural habitats in Southeast Asia. Although the taxonomy of some Southeast Asian pupinid genera has been reviewed, studies of Pupina Vignard, 1829, which contains the highest number of species, and a lesser-known genus Pupinella Gray, 1850 are still lacking. Herein we present an annotated checklist with an up-to-date systematic framework of the Pupinidae in Thailand based on both field investigations and literature surveys, and include the taxonomic treatment of all Pupina and Pupinella species from mainland Southeast Asia.

This annotated checklist contains 30 nominal species and two subspecies from seven genera currently known to occur in Thailand. We describe two species of Pseudopomatias (Pseudopomatias doiangkhangensis Jirapatrasilp, sp. nov. and P. pallgergelyi Jirapatrasilp, sp. nov.), five species and one subspecies of Pupina (Pupina bensoni Jirapatrasilp, sp. nov., P. bilabiata Jirapatrasilp, sp. nov., P. godwinausteni Jirapatrasilp, sp. nov., P. latisulci Jirapatrasilp, sp. nov., P. stoliczkai Jirapatrasilp, sp. nov., and P. dorri isanensis Jirapatrasilp, ssp. nov.) as new to science. New records of Coptocheilus sumatranus, Pupinella mansuyi, and Rhaphaulus tonkinensis are also reported from Thailand. The mainland Southeast Asian Pupina species are classified into three species groups (Pupina artata group, Pupina arula group, and Pupina aureola group) based on the distinction of shell teeth and canals, and operculum. Three species formerly in Pupina from Vietnam are allocated to Pupinella (P. illustris comb. nov., P. sonlaensis comb. nov., and P. thaitranbaii comb. nov.) due to the presence of a funnel-like anterior canal.

Keywords: Biodiversity, malacofauna, “prosobranch”, systematics, taxonomy

 

Habitat and vegetation around A Luang Cave, Chiang Rai, northern Thailand B Wang Daeng Cave, Phitsanulok, central Thailand C Tak Fa, Nakhon Sawan, central Thailand D Klong Had, Sra Keo, eastern Thailand E Khao Wong Cave, Uthai Thani, central Thailand F Phanom, Surat Thani, southern Thailand, and G Tham Khiriwong Temple, Prachub Kirikhan, western Thailand.

 

Live specimens of A, B Pollicaria mouhoti mouhoti: specimens A CUMZ 12166 and B CUMZ 12175 from Wang Daeng Cave, Phitsanulok C Pollicaria mouhoti monochroma, paratype CUMZ 1562 from Tam Pha Bing Temple, Loei D Tortulosa tortuosa, specimen CUMZ 12155 from Tham Suea Temple, Krabi
E–H Pupina artata: specimens of E CUMZ 12006 from Pha Daeng Cave, Mae Hong Son F CUMZ 12008 from Tham Nam Pha Pha Ngam Temple, Lampang, and G, H CUMZ 12029 from Khao Tham Raet Temple, Chachoengsao showing the brown (G) and grey (H) shell morphs;

All not to scale.

 

Live specimens of A–C Pupina artata: specimens A CUMZ 12020 from Buri Ratchawanaram Temple, Ratchaburi B CUMZ 12022 from Golden Dragon Cave, Ratchaburi, and C CUMZ 12037 from Wua Ta Lap Island, Surat Thani D, E Pupina bensoni sp. nov. D paratype CUMZ 12045/2 from Khao Wong Cave, Uthai Thani and E specimen CUMZ 12047 from Tham Namthip Bureau of Monks, Uthai Thani F, G Pupina peguensis: specimens F CUMZ 12050 from Chai Thong Wararam Temple, Nakhon Sawan and G CUMZ 12051 from Tham Saeng Wiset Bureau of Monks, Nakhon Sawan H Pupina siamensis, specimen CUMZ 12069 from Khao Chi Chan Buddha Image, Chonburi. All not to scale.

Live specimens of A Pupina siamensis, specimen CUMZ 12071 from Tham Khao Loi Temple, Rayong B–D Pupina bilabiata sp. nov. B paratype CUMZ 12073/2 from Banpot Pisai Temple, Chumphon and specimens C CUMZ 12082 from Pha Jor Cave, Nong Bua Lam Phu and D CUMZ 12087 from Ban Yai, Surat Thani E, F Pupina godwinausteni sp. nov.: paratypes E CUMZ 12090/26 and F CUMZ 12091 from Khao Wong Cave, Uthai Thani G, H Pupina aureola: specimens G CUMZ 12117 from Lod Cave, Nakhon Sri Thammarat and H CUMZ 12121 from Tham Thong Panara Temple, Nakhon Sri Thammarat, showing its microhabitat in rotten log. All not to scale.

 

Parin Jirapatrasilp, Chirasak Sutcharit and Somsak Panha. 2022. Annotated Checklist of the Operculated Land Snails from Thailand (Mollusca, Gastropoda, Caenogastropoda): the Family Pupinidae, with Descriptions of several New Species and Subspecies, and Notes on Classification of Pupina Vignard, 1829 and Pupinella Gray, 1850 from mainland Southeast Asia. ZooKeys. 1119: 1-115. DOI: 10.3897/zookeys.1119.85400 

 

รายชื่อของหอยทากบกในวงศ์ Pupinidae ที่พบในประเทศไทยทั้งสิ้น 30 สปีชีส์และ 2 สปีชีส์ย่อยจากทั้งหมด 7 สกุลด้วยกัน และเป็นชนิดใหม่ของโลกทั้งสิ้น 7 สปีชีส์และ 1 สปีชีส์ย่อยดังนี้

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1. Pseudopomatias doiangkhangensis Jirapatrasilp, 2022 หอยกระสวยจิ๋วขึ้นสันดอยอ่างขาง

พบได้ที่ดอยอ่างขาง อ.ฝาง จ.เชียงใหม่

2. Pseudopomatias pallgergelyi Jirapatrasilp, 2022 หอยกระสวยจิ๋วขึ้นสันพอลล์เกิร์จลี

ตั้งชื่อเป็นเกียรติแด่ Dr. Barna Páll-Gergely นักสังขวิทยาชาวฮังการีที่ศึกษาวิจัยหอยทากบกหลายกลุ่ม รวมทั้งหอยทากบกในวงศ์ Pupinidae พบได้ที่ถ้ำผาแดง อ.เมือง จ.แม่ฮ่องสอน

3. Pupina bensoni Jirapatrasilp, 2022 หอยเปลือกมันเบนสัน

ตั้งชื่อเป็นเกียรติแด่ W.H. Benson นักสังขวิทยาชาวไอริชในช่วงคริสต์ศตวรรษที่ 19 ที่ศึกษาและตั้งชื่อหอยทากบกชนิดใหม่ของโลกจำนวนมากจากอินเดียและเมียนมาร์ รวมถึงชื่อของหอยเปลือกมันสกุล Pupina ที่เก่าแก่ที่สุดในภูมิภาคนี้ 2 ชนิด พบได้ที่ถ้ำเขาวง อ.บ้านไร่ จ.อุทัยธานี

4. Pupina bilabiata Jirapatrasilp, 2022 หอยเปลือกมันปากซ้อน

โดยชื่อ "bilabiata" หมายถึงปากเปลือกที่มีสองชั้น พบได้ที่ภาคอีสานและภาคใต้ของไทย

5. Pupina godwinausteni Jirapatrasilp, 2022 หอยเปลือกมันก็อดวินเอาสเทน

ตั้งชื่อเป็นเกียรติแด่ H.H. Godwin-Austen นักสังขวิทยาชาวอังกฤษในช่วงปลายคริสต์ศตวรรษที่ 19 ที่ศึกษาและตั้งชื่อหอยทากบกชนิดใหม่ของโลกจำนวนมากจากภูมิภาคเอเชียใต้และเอเชียตะวันออกเฉียงใต้ พบได้ที่ จ.อุทัยธานี

6. Pupina latisulci Jirapatrasilp, 2022 หอยเปลือกมันร่องกว้าง
โดยชื่อ "latisulci" หมายถึงร่องตรงฟันเปลือกที่กว้างขึ้นทั้งสองร่อง พบได้ที่เขาอกทะลุ อ.เมือง จ.พัทลุง

7. Pupina stoliczkai Jirapatrasilp, 2022 หอยเปลือกมันสโตลิกซกา 

ตั้งชื่อเป็นเกียรติแด่ F. Stoliczka นักสังขวิทยาชาวเช็คในช่วงคริสต์ศตวรรษที่ 19 ที่ศึกษาและตั้งชื่อหอยทากบกชนิดใหม่ของโลกจำนวนมากจากภูมิภาคเอเชียใต้และเอเชียตะวันออกเฉียงใต้ พบได้ที่วัดราชบูรณะ อ.หลังสวน จ.ชุมพร

8. Pupina dorri isanensis Jirapatrasilp, 2022 หอยเปลือกมันอีสาน 

พบได้ที่เขาหินปูนทางภาคอีสาน