[Ichthyology • 2024] Oryzias chenglongensis • A New ricefish of Genus Oryzias (Beloniformes: Adrianichthyidae) from western Taiwan

Oryzias chenglongensis 

Chen & Lai, 2024

 DOI: doi.org/10.11646/zootaxa.5550.1.32 

 

Abstract

The new brackish ricefish were collected recently from western Taiwan which has been identified as the species new to science. The new species, Oryzias chenglongensis n. sp. can be well distinguished from other congeners by the following unique combination of features: (1) fin-ray counts: dorsal-fin rays 6 (6 seen in holotype); anal-fin rays 19–20 (19); pelvic-fin rays 6 (6); pectoral-fin rays 10 (10); principle caudal-fin rays i,4/5,i (i,4/5,i); (2) body compressed laterally with body depth at pelvic origin 24.0–24.3 (24.3), body depth at anal fin origin 15.5–20.4 (20.4); (3) the dorsal-fin origin inserted almost at the vertical of 14th anal-fin rays, membrane between dorsal-fin 5th and 6th rays without distinct notch in adult male; and (4) body translucent, light yellowish green or brown, scattered with minute melanophores, a narrowly dotted, longitudinal black line along the middle forward to vertical above pelvic fin; T-shape black mark of caudal fin base in male; operculum and pre-pectoral region slivery, no any silvery scales on lateral body, lip color grayish or creamy yellow and eye bluish silvery dorsally. The diagnostic characters, and comparison with related species would be also provided.

Pisces, New species, fish fauna, Oryzias, fish taxonomy, brackish, conservation, Taiwan

Oryzias chenglongensis n. sp., Chenglong wetland, Yunlin County, Taiwan.
male, NTOUP-2018-06-310; 24.8 mm SL, 
female, NTOUP-2018 -06-311, 26.6 mm SL, 

Oryzias chenglongensis new species

Diagnosis: The new species, Oryzias chenglongensis can be well distinguished from other congeners by the following unique combination of features: (1) fin-ray counts: dorsal-fin rays 6 (6 seen in holotype); anal-fin rays 19–20 (19); pelvic-fin rays 6 (6); pectoral-fin rays 10 (10); principle caudal-fin rays i,4/5,i (i,4/5,i); (2) body compressed laterally with body depth at pelvic origin 24.0–24.3 (24.3), body depth at anal fin origin 15.5–20.4 (20.4); (3) the dorsal-fin origin inserted almost at the vertical of 14th anal-fin rays, membrane between dorsal-fin 5th and 6th rays without distinct notch in adult male; and (4) body translucent, light yellowish green or brown, scattered with minute melanophores, a narrowly dotted, longitudinal black line along the middle forward to vertical above pelvic fin; T-shape black mark of caudal fin base in male; operculum and pre-pectoral region slivery, no any silvery scales on lateral body, lip color grayish or creamy yellow and eye bluish silvery dorsally.

Etymology: The specific name, chenglongensis, is referred to names of the fish holotype locality collected “Chonglong wetland”, western Taiwan although its available geographical range may from Yun-lin, Chiar-Yi, to Tai-Nan of western Taiwan.

I-Shiung CHEN and Hong-Thih LAI. 2024. A New ricefish of Genus Oryzias (Teleostei: Adrianichthyidae) from western Taiwan.  Zootaxa. 5550(1); 320-327. DOI: doi.org/10.11646/zootaxa.5550.1.32 

[Ichthyology • 2023] Oryzias loxolepis • A New lacustrine Ricefish (Beloniformes: Adrianichthyidae) from central Sulawesi, with A Redescription of Oryzias marmoratus

Oryzias loxolepis Kobayashi, Mokodongan & Yamahira, 

in Kobayashi, Mokodongan, Horoiwa, Fujimoto, Tanaka, Masengi et Yamahira, 2023.

DOI: 10.1007/s10228-023-00908-2 

 twitter.com/agoblind

Abstract

Oryzias loxolepis, new species, is described from Lake Towuti in the Malili Lake system, central Sulawesi, Indonesia. Historically this new species has been confused with Oryzias marmoratus (Aurich 1935), which we redescribe. While both species share dark brown blotches on a grayish-brown trunk, O. loxolepis differs from O. marmoratus in having 11 abdominal vertebrae, 12 or 13 transverse scales, a shorter caudal peduncle, terminal mouth, reduced nuchal concavity, slanted trunk scales, and a rounded male dorsal fin. Oryzias loxolepis can be also distinguished from Oryzias profundicola Kottelat 1990, another sympatric congener in Lake Towuti, in having a longer snout in both sexes, in males in having a larger head and eyes, and a black margined dorsal fin, and in females in having a shallower body depth at the anal- and dorsal-fin origins. A phylogenetic analysis based on genome-wide single nucleotide variants reveals O. loxolepis to be a sister taxon to O. profundicola rather than O. marmoratus. The identities of specimens historically referred to “O. marmoratus” in previous genetic studies are re-evaluated.

Keywords: Oryzias loxolepis, Ancient lake, Freshwater fish, Indonesia, Ricefish, Taxonomy

Oryzias loxolepis Kobayashi, Mokodongan and Yamahira, new species

 Etymology. The specific name “loxolepis” is derived from Ancient Greek “loxos”, meaning “oblique” and “lepis” meaning “scales”, referring to the diagonally aligned scales of this species.

Hirozumi Kobayashi, Daniel F. Mokodongan, Mizuki Horoiwa, Shingo Fujimoto, Rieko Tanaka, Kawilarang W. A. Masengi and Kazunori Yamahira. 2023. A New lacustrine Ricefish from central Sulawesi, with A Redescription of Oryzias marmoratus (Teleostei: Adrianichthyidae). Ichthyological Research. DOI: 10.1007/s10228-023-00908-2

  twitter.com/agoblind/status/1643697607376764928

[Ichthyology • 2022] Oryzias kalimpaaensis • A New Endemic Species of Pelvic-brooding Ricefish (Beloniformes: Adrianichthyidae: Oryzias) from Lake Kalimpa’a, Sulawesi, Indonesia

 Oryzias kalimpaaensis 

Gani, Suhendra, Herder, Schwarzer, Möhring, Montenegro, Herjayanto & Mokodongan, 2022

zoologicalbulletin.de 

Abstract

 Oryzias kalimpaaensis sp. nov. is a new species of the genus Oryzias Jordan & Snyder, 1906, endemic to Lake Kalimpa’a in Lore Lindu National Park, Central Sulawesi, Indonesia. The species is a pelvic-brooder, a non-monophyletic group of ricefishes in which females carry an egg cluster until hatching. Pelvic-brooding is known from only a few taxa, and the new species reported here is only the fifth pelvic-brooding species known so far. Oryzias kalimpaaensis sp. nov. differs from all others Oryzias species by the following combination of characters: 61–67 scales in lateral line, 11–13 dorsal-fin rays, 11–13 pectoral-fin rays, body depth 16.0–22.2% SL, and length of head 30.1–33.7% SL. It is distinguished from all species of the genus Adrianichthys Weber 1913, by its small size (max. 52.8 mm SL). A molecular phylogeny based on mitochondrial ND2 sequences supports the distinctiveness of O. kalimpaaensis sp. nov. Oryzias kalimpaaensis sp. nov. is closely related to pelvic-brooding O. eversi Herder, Hadiaty & Nolte 2012 endemic to Tilanga Pond in Tana Toraja, and to the two species of Lake Lindu in Central Sulawesi, O. sarasinorum (Popta 1905) and O. bonneorum Parenti 2008. As Lake Kalimpa’a is a popular destination for nature tourism, anthropogenic pressure is high. The presence of invasive fish species in the lake and parasites on collected specimens support thiss assumption.

 Key words. Endemic, Oryzias, freshwater fish, Kalimpa’a, pelvic-brooder. 

Living specimens of  Oryzias kalimpaaensis sp. nov.,
 ♂ (top) and ♀ (bottom)
from Lake Kalimpa’a, Central Sulawesi, Indonesia.

Oryzias kalimpaaensis sp. nov. 

 Lake Kalimpa’a Ricefish

Diagnosis. Oryzias kalimpaaensis sp. nov. is a pelvic-brooding ricefish with pronounced sexual dimorphism. Females share with females of other pelvic-brooding ricefishes (O. eversi, O. sarasinorum, A. oophorus) morphological structures that enable the maternal fish to carry bundles of fertilized eggs. The eggs remain connected to the female by filaments, and are carried in a ventral concavity present in females but not in males. 

Oryzias kalimpaaensis sp. nov. differs from all other Oryzias species from Sulawesi by unique lateral line scale counts (60–67 in O. kalimpaaensis sp. nov. vs. 70–75 in O. sarasinorum, vs. <58 in all remaining Sulawesi Oryzias). It has a deeper body than O. sarasinorum (16.0–22.2% SL vs. 13–15% SL). Oryzias kalimpaaensis sp. nov. has more dorsal-fin rays (11–13) than ...

Etymology. The species epithet, ‘kalimpaaensis’, denotes the occurrence of this species in Lake Kalimpa’a, Central Sulawesi, the type locality.

Lake Kalimpa’a: type locality of Oryzias kalimpaaensis sp. nov., in Central Sulawesi, Indonesia.

Abdul Gani, Novian Suhendra, Fabian Herder, Julia Schwarzer, Jan Möhring, Javier Montenegro, Muh. Herjayanto and Daniel F. Mokodongan. 2022. A New Endemic Species of Pelvic-brooding Ricefish (Beloniformes: Adrianichthyidae: Oryzias) from Lake Kalimpa’a, Sulawesi, Indonesia. Bonn Zoological Bulletin. 71(1); 77-85. DOI: 10.20363/bzb-2022.71.1.077

zoologicalbulletin.de/BzB_Volumes/Volume_71_1/077_mokodongan_20220630.pdf

https://zoologicalbulletin.de/articles/online-first

[Ichthyology • 2020] Nomorhamphus aenigma • A New “Beakless” Halfbeak of the Genus Nomorhamphus (Teleostei: Zenarchopteridae) from Sulawesi

Nomorhamphus aenigma 

Kobayashi, Masengi & Yamahira, 2020

 DOI: 10.1643/CI-19-313

  twitter.com/agoblind

www.u-ryukyu.ac.jp

Abstract

A new viviparous halfbeak, Nomorhamphus aenigma, new species, from the upper stream of the Cerekang River in central Sulawesi, Indonesia is described. The new species is distinguished from all other zenarchopterids by the complete absence of elongate lower jaws. Although secondary loss of elongate jaws is also known from several hemiramphids, N. aenigma, new species, is clearly different from them by having no elongate jaws throughout ontogeny.

Fig. 2 Photographs of Nomorhamphus aenigma, new species, immediately after fixation.
 (A) MZB 25100, holotype (male, 34.7 mm SL),
(B) MZB 25103, paratype (female, 37.8 mm SL),
(C) NSMT-P 136106, paratype (female, 43.0 mm SL).

Nomorhamphus aenigma, new species

 

Diagnosis.—Nomorhamphus aenigma is distinguished from all other congeners by the absence of any elongation of the lower jaw throughout ontogeny. Nomorhamphus aenigma is also distinguished from all other congeners by a combination of the short and expanded teeth on gill rakers, 22–23 precaudal and 16–17 caudal vertebrae, 13–14 anal-fin rays, 12 segments in the male first anal-fin ray, and distal tips of the male second and third anal-fin rays having no contact with each other.

Fig. 4 Type locality of Nomorhamphus aenigma, Cerekang River, approximately 600 m downstream from Laroeha Village, Luwu Timur District, Regency of Wasuponda, Sulawesi Selatan. Photo taken 3 September 2019.

Distribution and habitat.—Nomorhamphus aenigma is known from the main stream of Cerekang River in Sulawesi Selatan, Indonesia (Fig. 1). The river belongs to the Malili River basin. The holotype was collected from a locality near Laroeha Village. The type locality (2°27′39.7″S, 121°04′03.0″E) is approximately 10 m in width and 1.5 m in depth, partially shaded by forest canopy, and has mud and gravel as substrates (Fig. 4). Nomorhamphus rex (Fig. 7), Oreochromis niloticus, Oryzias dopingdopingensis, Osteochilus vittatus, Redigobius penango, and Telmatherina sp. co-occurred.

Etymology.—The specific name “aenigma,” from ancient Greek noun for “riddle,” refers to the riddle raised by this species: “why are the mandibles of most halfbeaks long?”

Fig. 7 Photographs of Nomorhamphus rex immediately after fixation.
Upper: NSMT-P 136117 (male, 35.5 mm SL),
lower: NSMT-P 136116 (female, 47.6 mm SL).

Hirozumi Kobayashi, Kawilarang W. A. Masengi and Kazunori Yamahira. 2020. A New “Beakless” Halfbeak of the Genus Nomorhamphus from Sulawesi (Teleostei: Zenarchopteridae).  Copeia 108(3), 522-531. DOI: 10.1643/CI-19-313

  twitter.com/agoblind/status/1308641453120188416

www.u-ryukyu.ac.jp/news/16406 

[Ichthyology • 2019] Revision of the Subgenus Zonocypselurus Parin and Bogorodsky, 2011 [A Review of the Flying Fish Genus Cypselurus (Beloniformes: Exocoetidae). Part 1]

in Shakhovskoy & Parin, 2019. 

DOI:  10.11646/zootaxa.4589.1.1

Abstract

The first part of the review of the four-winged flying fishes of the genus Cypselurus is presented, and shows that seven species belonging to two genera were mixed under the name Cypselurus (Zonocypselurus) hexazona, none of which is identical to Exocoetus hexazona Bleeker. A new subgenus of flying fish (Amustotrogon subgen. nov.) and four new species (Cheilopogon marisrubri, Cheilopogon katherinae, Cypselurus bosha, Cypselurus olpar) are described. The validity of Cypselurus formosus Kotthaus, 1969 is reinstated (as Cheilopogon (Amustotrogon) formosus). Three subspecies of Cheilopogon formosus are recognized: Ch. formosus formosus, Ch. f. pseudospilopterus subsp. nov. and Ch. f. andamanicus subsp. nov. Morphology of species and subspecies at different stages of ontogeny is described. Maps of their geographical distribution are presented. A key for identification of flying fish taxa described in the work is included.

Keywords: Pisces, Systematics, morphology, distribution, Cypselurus hexazona, C. bosha sp. nov., C. olpar sp. nov., Amustotrogon subgen. nov., Cheilopogon formosus new combination, Ch. f. pseudospilopterus subsp. nov., Ch. f. andamanicus subsp. nov., Ch. marisrubri sp. nov., Ch. katherinae sp. nov., Red Sea endemics

Ilia B. Shakhovskoy and Nikolay V. Parin. 2019. A Review of the Flying Fish Genus Cypselurus (Beloniformes: Exocoetidae). Part 1. Revision of the Subgenus Zonocypselurus Parin and Bogorodsky, 2011 with Descriptions of One New Subgenus, Four New Species and Two New Subspecies and Reinstatement of One Species as Valid. Zootaxa. 4589(1); 1–71. DOI:  10.11646/zootaxa.4589.1.1

Parin, N.V. and Bogorodsky, S.V. 2011. Distribution and morphology of flying fish Cypselurus hexazona placed into a separate subgenus Zonocypselurus subgen. nov. Voprosy Ikhtiologii, Vol. 51 (5), 683–686. [In Russian, English translation in Journal of Ichthyology, 51 (8), 658–661 (second author misspelled as Bogorodskiy)]

researchgate.net/publication/257843717_Distribution_and_morphology_of_flying_fish_Cypselurus_hexazona_placed_into_a_separate_subgenus_Zonocypselurus_subgen_nov

[Ichthyology • 2018] Oryzias dopingdopingensis • A New Riverine Ricefish of the Genus Oryzias (Beloniformes, Adrianichthyidae) from Malili, Central Sulawesi, Indonesia

Oryzias dopingdopingensis 

Mandagi, Mokodongan, Tanaka & Yamahira, 2018

DOI:  10.1643/CI-17-704 
 twitter.com/ASIHCopeia

  

We describe Oryzias dopingdopingensis, a new species of ricefish, from Doping-doping River, a river in Malili in central Sulawesi, Indonesia. The new riverine species is distinguished from lacustrine congeners in Malili Lakes by a combination of 33–36 scales along the lateral midline and body depths of 20.3–25.5% standard length (SL). Oryzias dopingdopingensis, new species, is also distinguished from all other Sulawesi Oryzias by a combination of 8–9 dorsal-fin rays, caudal peduncle depths of 10.2–11.4% SL, eye diameters of 8.5–9.9% SL, and maximum SL up to 35.8 mm. In breeding males, 5–8 black blotches or bars appear along the lateral midline. Analyses of mitochondrial ND2 sequences revealed that O. dopingdopingensis, new species, carry distinct haplotypes from those of the Malili lacustrine species, suggesting no hybridization between them, although Doping-doping River shares an estuarine region with the Malili Lake system. Instead, O. dopingdopingensis, new species, is in a monophyletic group with O. sarasinorum and O. eversi in western Sulawesi. However, unlike these two pelvic brooders, we observed that females of O. dopingdopingensis, new species, deposit eggs soon after spawning and exhibit no maternal care.

Fig. 3. Live adult male (Top) and female (Bottom) of Oryzias dopingdopingensis in the laboratory.

(Photographs by N. Hashimoto).

Oryzias dopingdopingensis, new species 
Doping-doping Ricefish
New Japanese name: Dopindopin-medaka
...

Etymology.— The specific name, dopingdopingensis, denotes the occurrence of this species in the Doping-doping River, the type locality.





Ixchel F. Mandagi, Daniel F. Mokodongan, Rieko Tanaka and Kazunori Yamahira. 2018.A New Riverine Ricefish of the Genus Oryzias (Beloniformes, Adrianichthyidae) from Malili, Central Sulawesi, Indonesia. Copeia. 106(2):297-304. DOI:  10.1643/CI-17-704

 twitter.com/ASIHCopeia/status/1006937303657435136

Kami mendiskripsikan Oryzias dopingdopingensis, satu jenis baru ikan padi dari sungai Doping-doping, sebuah sungai di Malili di Sulawesi Tengah, Indonesia. Jenis baru yang hidup di sungai ini dibedakan dari jenis yang hidup di danau-danau Malili dengan kombinasi dari 33–36 jumlah sisik sepanjang garis sisi dan lebar tubuh 20.3–25.5% SL. Oryzias dopingdopingensis, jenis baru ini, juga dibedakan dari semua Oryzias Sulawesi lainnya dengan kombinasi dari 8–9 jumlah jari-jari sirip belakang, lebar dari batang ekor 10.2–11.4% SL, diameter mata 8.5–9.9% SL, dan maksimal SL mencapai 35.8 mm. Jantan dalam masa perkembangbiakannya, 5–8 bercak-bercak hitam atau baris akan muncul di sepanjang garis sisi. Analisis urutan mitokondria ND2 memperlihatkan bahwa O. dopingdopingensis, jenis baru ini, memiliki haplotype yang berbeda dari jenis yang hidup di daerah danau Malili, Ini menunjukkan tidak terjadi hibridisasi diantara mereka, walaupun Sungai Doping-doping berbagi wilayah muara dengan Danau Malili system. Sebagai gantinya, O. dopingdopingensis, jenis baru ini, menjadi monofiletik dengan O. sarasinorum dan O. eversi di Sulawesi bagian barat. Tidak seperti dua “pelvic brooders”, bagaimanapun, kami mengamati bahwa betina dari O. dopingdopingensis, jenis baru ini, melepaskan telur-telurnya segera setelah pemijahan dan tidak menunjukkan “maternal care”.

[Ichthyology • 2013] Three New Species of Freshwater Halfbeaks (Teleostei: Zenarchopteridae: Hemirhamphodon) from Borneo; Hemirhamphodon sesamum, H. byssus & H. kecil

Hemirhamphodon sesamum, H. byssus & H. kecil

Tan & Lim, 2013

LKCNHM.nus.edu.sg

Three new species of Hemirhamphodon are described from Borneo island. Hemirhamphodon sesamum, new species, from lowland basins draining into the Makassar Strait, differs from its congeners in having unique colour markings on its dorsal fin and lower jaw; males with posterior projections on the fourth anal-fin ray, with third, fourth and eighth anal-fin rays branched, and with posterior projections on the fourth anal ray; females with third and fourth anal-fin rays branched. Hemirhamphodon byssus, new species, from southern Sarawak differs from the allopatric H. kuekenthali in having the anterior dorsal-fin ray extensions reaching to the middle of the caudal fin (vs absence or small extensions on dorsal-fin rays), black pigment on the anterior half of dorsal fin (vs middle part of dorsal fin), males with posterior projections on the fourth anal-fin ray. Hemirhamphodon kecil, new species, from the lower Mahakam in East Kalimantan, can be distinguished from its congeners in having few or no markings except for sparse black pigment along sub-margin of the dorsal fin and anterior dorsal margin of the caudal-fin base. It is a small species (up to 41 mm SL). Notes and a figure of the holotype of H. phaiosoma are provided, along with colour descriptions of fresh material. An artificial key to Hemirhamphodon, inclusive of the new species, is also included.

Key words: Hemirhamphodon, Southeast Asia, biodiversity, taxonomy, allopatry

  

Hemirhamphodon sesamum, new species 

Etymology. — The species name refers to the minute oily seeds of the Sesamum plant (Pedaliaceae); in allusion to the small black spots/dashes on the dorsal fin with which resemble black sesame seeds. Used as a noun in apposition.

Distribution. — Hemirhamphodon sesamum is currently known only from South Kalimantan, Indonesian Borneo, in lowland drainages of the Batulicin and Cantung basins that drain eastwards into the Makassar Strait (Fig. 7).

Hemirhamphodon byssus, new species (Figs. 9A–E, 10A, 11A, B)

Dermogenys species undetermined – Doi et al., 2001: 16, Fig. 2 

Hemirhamphodon kuekenthali (non-Steindachner) – Anderson & Collette, 1991 (part); Kottelat & Lim, 1995 (part); Doi et al., 2001; Jongkar & Lim, 2004

Hemirhamphodon pogonognathus (non-Bleeker) – Roberts, 1989 (part)

Etymology. — From the Latin byssus, meaning fine thread, in allusion to the distinct filamentous dorsal-fin rays of large males. Used as a noun in apposition.

Distribution. — Hemirhamphodon byssus is known from the lowland stream systems in southern Sarawak that include Sematan, Lundu, Bau, Batu Kawa, Matang, Bako, Serian, Balai Ringin, Gedong and Sri Aman (Fig. 7). From Sibu northwards (including Bintulu and Baram areas, and Brunei Darussalam), it is replaced by H. kuekenthali with which it is apparently allopatric. This distribution pattern is shared with the following allopatric species pairs (in south–north orientation): Rasbora kalochroma/R. kottelati (Lim, 1995), Betta ibanorum/B. akarensis (Tan & Ng, 2004, 2005).

Hemirhamphodon kecil, new species (Figs. 12A–E, 13A, B) 

Hemirhamphodon pogonognathus (non-Bleeker) – Anderson & Collette, 1991 (part); Christenson, 1992; Kottelat et al., 1993 (part); Kottelat, 1994.

Distribution. — Hemirhamphodon kecil is currently known only from East Kalimantan, Indonesian Borneo, in the waterways of the lower Mahakam basin that drain eastwards into the Makassar Strait (Fig. 7).

Etymology. — From the Bahasa Indonesian word ‘kecil’, meaning small, in reference to the diminutive size of this species. Used as a noun in apposition.

Heok Hui Tan and Kelvin K. P. Lim. 2013. Three New Species of Freshwater Halfbeaks (Teleostei: Zenarchopteridae: Hemirhamphodon) from Borneo.
The Raffles Bulletin of Zoology. 61(2): 735-747.

http://LKCNHM.nus.edu.sg/rbz/biblio/61/61rbz735-747.pdf

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