[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 • 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 • 2011] Oryzias haugiangensis • the First Record from the brackish waters in the Southeastern Thailand

FIGURE 2. Oryzias huagiangensis Roberts, 1998. Material specimens (A) NIFI 4260 from Thailand (fresh condition) and (B) CTU-P 2167 from Vietnam (fixed condition). Bars indicate 5 mm.

ABSTRACT

Specimens of the ricefish, Oryzias haugiangensis, reported here for the first time from the brackish waters in the southeastern Thailand, were caught in a mangrove forest habitat. This study compares the morphometric and meristic characters and the karyotype of O. haugiangensis with those of the Andaman sea specimens of O. javanicus which are clearly distinguishable by the length of the snout, head, preanal, preanal fin, prepelvic fin and anal fin base, plus the body depth at the anterior of the anal fin origin. Oryzias haugiangensis is similar to O. javanicus in the number of pelvic fin and branchiostegal rays present, and in the diploid chromosome number (2n = 48), but differs from the latter in that it has a lower number of anal fin and pectoral fin rays and has a different karyotype, with 2n = 48 (2 SM + 23 A; NF = 54). Oryzias haugiangensis belongs to monoarmed chromosome group within the genus Oryzias.

KEY WORDS: Oryzias haugiangensis, mangrove habitat, morphology, karyotype

FIGURE 3. Geographical distribution of Oryzias in south and southeast Thailand. Solid triangle, O. javanicus from Ranong; open triangle, O. javanicus from Phuket; solid circle, O. haugiangensis from Vietnam; open circle, O. haugiangensis from Thailand.

Magtoon, W. 2011. First Record of the Ricefish, Oryzias haugiangensis (Adrianichthyidae: Oryziinae), from Southeastern Thailand. Tropical Natural History 11(1): 9-20. http://www.biology.sc.chula.ac.th/TNH/vol11no1/9-20%20%20Magtoon%20TNH%2011-1.pdf

[Ichthyology • 2010] ปลาซิวข้าวสารแม่น้ำสงคราม | Oryzias songkhramensis • new ricefish (Adrianichthyidae) from northeasthern Thailand & central Laos

ปลาซิวข้าวสารแม่น้ำสงคราม Oryzias songkhramensis

http://siamensis.org/content/4382

ABSTRACT

A new ricefish, Oryzias songkhramensis n. sp., is described on the basis of fifty-one specimens (12.9 - 19.0 mm SL) from three localities in the Songkhram and Mekong basins in northeast Thailand and from two localities in Laos. The new species is distinguished from all other congeners by possessing the following combination of characters: anal-fin rays 15 - 16 (modally 16), bony contact organs on the anal-fin rays in males; a relatively anterior dorsal fin origin, opposite anal fin 13 - 14 (modally 14); vertebrae 27 - 29 (modally 28); cycloid scales 26 - 29 (modally 27) in lateral series, and predorsal scales 19-21 (modally 21). Oryzias songkhramensis n. sp. is similar to O. mekongensis in the number of dorsal-fin rays and branchiostegal rays, but differs from the latter in having fewer vertebrae, a lower number of scales in the predorsal and lateral scale series, and black and pale yellow marginal bands on the dorsal and ventral portions of the caudal fin (vs. bright orange and black marginal bands on the dorsal and ventral portions of the caudal fin in O. mekongensis). In addition, both the principal component analysis (PCA) and canominal discriminant analysis (CDA) for morphometric characters showed that O. songkhramensis and O. mekongensis differed from each other, although the morphological differences in O. songkhramensis were larger than those in both O. minutillus and O. mekongensis. Analysis of the phylogenetic relationships of six Oryzias species, based upon partial sequences of the mitochondrial control region, revealed three important groups; the javanicus, celebensis and mekongensis or latipes groups, and a close relationship between O. songkhramensis from Thailand and Laos (bootstrap support of 100%) with O. mekongensis as a sister group. The results of the phylogenetic study showed a tendency to classify O. songkhramensis as a member of the latipes group.

KEY WORDS: Oryzias, Adrianichthyidae, bony contact organs, Thailand, Laos

FIGURE 2. Oryzias songkhramensis sp. nov., holotype, KUMF 7021, 16.7 mm SL, male; Thailand: Rattanawapi, Nakhon Phanum province, Mekong basin, lateral view. Bar indicates 4 mm.

FIGURE 3. Oryzias songkhramensis n. sp., upper: holotype, KUMF 7021, male; lower: paratype, NIFI 3390,

female. Bar indicates 5 mm.

FIGURE 9. Geographic distribution of Oryzias sp. in S.E.Asia. O. songkhramensis n. sp. (solid circles), O.

minutillus (open circles), O. mekongensis (open triangles) and O. pectoralis (solid triangles), based on the

specimens examined in these studies.

Magtoon, W. 2010. Oryzias songkhramensis, a new species of ricefish (Beloniformes; Adrianichthyidae) from the northeast Thailand and central Laos. Tropical Natural History, 10: 107-129.: http://www.biology.sc.chula.ac.th/TNH/v10%20no1/9%20Magtoon%20107-129.pdf

(23 ก.ค.) รศ.ดร.วิเชียร มากตุ่น คณบดีคณะวิทยาศาสตร์ มหาวิทยาลัยศรีนครินทรวิโรฒ (มศว.) ในฐานะนักวิจัยด้านมีนะวิทยา ซึ่งค้นคว้าวิจัยด้านสายพันธุ์ปลา เปิดเผยว่า ขณะนี้ มศว. ได้ค้นพบปลาสายพันธุ์ใหม่ในนาข้าวของโลก ได้ตั้งชื่อว่า Oryzias songkhramensis Magtoon,2010 และยังไม่ได้ตั้งชื่อภาษาไทยซึ่งปลาดังกล่าวค้นพบในเขตลุ่มแม่น้ำโขง เขตอำเภอรัตนวาปี จ.หนองคาย นอกจากนี้ยังพบปลาสายพันธุ์นี้ในประเทศสาธารณรัฐประชาธิปไตยประชาชนลาวหรือ บริเวณพื้นที่ลาวตอนกลาง ทั้งนี้การค้นพบปลาสายพันธุ์ใหม่ดังกล่าวบ่งบอกให้เห็นถึงความสมบูรณ์ตาม ธรรมชาติในเขตลุ่มน้ำโขงในประเทศไทย ส่วนลักษณะของปลาชนิดนี้จะเป็นปลาในนาข้าว ขนาดเล็ก ความยาวประมาณ 1 เซนติเมตร อาศัยอยู่กันเป็นฝูงและกินตัวอ่อนของพวกยุงเป็นอาหาร และยังกินตัวอ่อนของแมลงบางชนิดที่เป็นศัตรูพืช ซึ่งเป็นการควบคุมความสมดุลของธรรมชาติ โดยไม่จำเป็นต้องใช้ยาฆ่าแมลงในนาข้าวมากจนเกินความจำเป็น

รศ.ดร.วิเชียว กล่าวต่อไปว่า ทุกวันนี้เราพบปลาในนาข้าวทั้งสิ้น 24 สปีชี่ จากทั่วโลก Oryzias songkhramensis Magtoon,2010 จึงถือเป็นสปีชี่ที่ 25ของโลก และที่ผ่านมาประเทศไทยพบปลาในนาข้าวมาแล้วทั้งสิ้น 4 สปีชี่ หากรวม Oryzias songkhramensis Magtoon,2010 ทำให้ประเทศไทยค้นพบปลาในนาข้าวทั้งสิ้น 5 สปีชี่ อย่างไรก็ตาม การค้นพบครั้งนี้จะทำให้วงการมีนะวิทยาเกิดการตื่นตัวมากขึ้น และจะเป็นประโยชน์ทางด้านวิทยาศาสตร์อย่างกว้างขวาง โดยเฉพาะด้านมีนะวิทยา ความรู้ทางด้านปลาในนาข้าว และขณะนี้ประเทศญี่ปุ่นให้ความสนใจอย่างมาก โดย มศว. มีความร่วมมือกับ 3 มหาวิทยาลัยในประเทศญี่ปุ่น คือ ม.โตเกียว ม.มินาฮาตะ และม.ชินชู ศึกษาปลาในนาข้าวในแถบทวีปเอเชียด้วย

“ทรัพยากรธรรมชาติของไทยมีหลายชนิดที่น่าสนใจและน่าศึกษา ดังนั้นผมอยากให้คนไทยทุกคนและหน่วยงานที่เกี่ยวข้องอนุรักษ์สิ่งแวดล้อม โดยเฉพาะการช่วยกันรักษาแม่น้ำลุ่มน้ำเดิมไว้ให้มากที่สุดเท่าที่จะทำได้ และอย่านำปลาต่างถิ่นไปปล่อยลงในแม่น้ำ เพราะปลาต่างถิ่นจะมีลักษณะดุร้าย และกัดปลาในพื้นถิ่น ขณะนี้ปลาต่างถิ่นสร้างปัญหาสิ่งแวดล้อมให้กับลุ่มน้ำในประเทศไทยอย่างมาก เพราะปลาต่างถิ่นจะมากินไข่ปลาพื้นถิ่นสุดท้ายปลาพื้นถิ่นจะสูญพันธุ์ และส่งผลต่อระบบนิเวศวิทยา โรคระบาดต่างๆ จะเพิ่มและรุนแรงขึ้น เพราะระบบวงจรถูกทำลาย” รศ.ดร.วิเชียร กล่าว.

ข่าวจาก DailyNews.co.th

[Ichthyology • 2009] A revised taxonomic Account of ricefish Oryzias (Beloniformes; Adrianichyidae), in Thailand, Indonesia and Japan

ABSTRACT

A taxonomic account of Oryzias minutillus, O. mekongensis, O. dancena, and O. javanicus from Thailand, O. celebensis from Indonesia and O. latipes from Japan are redescribed. Six distinct species are recognized. Keys, descriptions and illustrations of the species are presented. Morphological differences between and within all six species are clarified. Twenty-two morphometric characters and ten meristic characters were examined, and 14 morphometric and nine meristic characters were found to differ amongst the six species. Anal-fin ray numbers of O. cellebensis, O. javanicus, O. dancena, O. minutillus, O. latipes and O. mekongensis were 22, 23, 24, 19, 18 and 15, respectively. These differences suggest that the six species may be reproductively isolated from each other.

KEY WORDS: Oryzias, Revision, Morphological difference, Cluster analysis

FIGURE 8. Geographical distribution of the Oryzias species: O. dancena , O. javanicus, O. mekongensis, O. minutillus, O. celebensis (▲) and O. latipes.

FIGURE 2. Illustration of Oryzias javanicus (Bleeker) based on material specimens of NIFI 3218; A, adult male and B, adult female, from Phuket province, Peninsular Thailand. Bar indicate 5 m

FIGURE 3. Illustration of Oryzias dancena (Hamilton), based on material specimens, NIFI 3236; A, adult male and B, adult female, from Ranong province, Peninsular Thailand. Bar indicate 5 mm.

FIGURE 4. Illustration of Oryzias minutillus Smith, 1945, based on material specimens, NIFI 3215; A, adult male and B, adult female, from Ban Tad, Udon Thani province, the Mekong region. Bar indicate 3 mm.

FIGURE 5. Illustration of Oryzias mekongensis Uwa and Magtoon, 1986, based on material specimens, NIFI 3209; A, adult male and B, adult female, from Udon Thani, province, Peninsular region. Bar indicate 3 mm.

FIGURE 6. Illustration of Oryzias latipes (Temminck & Schlegel 1846), NIFI 3424, A, adult male and B, adult female, from Gifu Prefecture, Japan. Bar indicate 5 mm.

FIGURE 7. Illustration of Oryzias celebensis (Weber, 1894), base on material specimens, NIFI 3237: A, adult male and B, adult female, from Sulawesi, Indonesia. Bar indicate 5 mm.

References:

Magtoon, W. and Termvidchakorn, A. 2009. A revised taxonomic Account of ricefish Oryzias (Beloniformes; Adrianichyidae), in Thailand, Indonesia and Japan. The Natural History Journal of Chulalongkhorn University, 9: 35-68.: http://www.biology.sc.chula.ac.th/NHJCU/9-1/4.%20Magtoon%20Proof5.2.pdf

Termvidchakorn, A. and Magtoon, W. 2008. Development and identification of the ricefish Oryzias in Thailand. ScienceAsia. 34: 416–423. doi: 10.2306/scienceasia1513-1874.2008.34.416 / http://www.scienceasia.org/2008.34.n4/scias34_416.pdf

[Ichthyology • 2008] Oryzias bonneorum • A phylogenetic analysis and taxonomic revision of Oryzias and relatives (Adrianichthyidae)

Figure 38. Oryzias bonneorum sp. nov., holotype, Lake Lindu, Sulawesi Tengah, Indonesia, male, MZB 15499, male, 52 mm SL.

Abstract

Ricefishes, known best by the model organism, the medaka, Oryzias latipes Temminck & Schlegel, 1846, comprise the family Adrianichthyidae, which ranges broadly throughout fresh and brackish waters of Central, South and Southeast Asia and the Indo-Malay-Philippines Archipelago as far east as Timor. Twenty-eight Recent species are recognized here in two monophyletic genera, Adrianichthys and Oryzias. Xenopoecilus and Horaichthys are placed in synonymy of Oryzias for the first time. Adrianichthys comprises four species from Lake Poso, Sulawesi, Indonesia. Oryzias comprises 24 species that live throughout the range of the family. A fossil genus and species, †Lithopoecilus brouweri from the Miocene of central Sulawesi, is included tentatively in the Adrianichthyidae. Evidence for the sister group relationship of adrianichthyids and exocoetoids is reviewed briefly and that relationship corroborated. Monophyly of adrianichthyids is likewise strongly supported here. Species groups within Oryzias are diagnosed as monophyletic largely based on osteology, colour pattern and meristic variation. They correspond only in part to species groups previously recognized based on chromosome constitution. Miniature species do not comprise a monophyletic group; disjunct absolute size in close relatives has evolved repeatedly. Oryzias latipes is a member of a species complex that includes O. luzonensis, O. curvinotus and the miniatures O. sinensis and O. mekongensis. A new species, Oryzias bonneorum sp. nov., is described from Lake Lindu, Sulawesi, Indonesia. Lectotypes are designated for Haplochilus celebensis Weber, 1894 and Haplochilus timorensis Weber & de Beaufort, 1922.

ADDITIONAL KEYWORDS: comparative morphology – homology – medaka – model organisms – miniaturization – phylogeny.

This study 'nov.':

Family Adrianichthyidae Weber, 1913

Genus Adrianichthys Weber, 1913

• A. oophorus (Kottelat, 1990a) comb. nov.

• A. poptae (Weber & de Beaufort, 1922) comb. nov.

Genus Oryzias Jordan & Snyder, 1906

• O. bonneorum sp. nov.

• O. sarasinorum (Popta, 1905) comb. nov.

• O. setnai (Kulkarni, 1940) comb. nov.

Figure 1. Oryzias dancena (Hamilton, 1822), the first described ricefish species, USNM 313908, adult female, 23.8 mm SL, above; adult male, 25.0 mm SL, below. Sri Lanka. Female is carrying a cluster of embryos.

Table 1. Classification of ricefishes, family Adrianichthyidae, as recognized in the present study

Figure 2. Approximate distributional limits of ricefishes, the family Adrianichthyidae, outlined and shaded. In the Philippines ricefishes are native only to the island of Luzon. Distribution throughout mainland China is estimated.

Parenti, L.R. 2008: A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae). Zoological journal of the Linnean Society, 154: 494–610. doi: 10.1111/j.1096-3642.2008.00417.x

[Ichthyology • 2011] Oryzias woworae • Remarkably Colorful, Small Ricefish from southeastern Sulawesi, Indonesia

Fig. 1. (upper) Live adult male Oryzias woworae photographed in the field

Fig. 2. (lower) Live adult female Oryzias woworae, center, with two adult males,

photographed in the field just after collection. Original photograph has been reversed.

Oryzias woworae • Daisy’s Ricefish

Oryzias woworae, a new species of ricefish, is described from a freshwater habitat on Muna Island off the southeastern coast of the main island of Sulawesi, Indonesia. The new species is distinguished from all other known ricefishes by a remarkable color pattern of both sexes in life: the ventral surface of head and body anterior to the pelvic fins, dorsal portion of pectoral fins, dorsal-fin base, posterior portion of anal-fin base, caudal peduncle, and dorsal and ventral portions of caudal fin are brilliant red; the midlateral scales from just posterior to the eye to the caudal-fin base and the body scales anterior to the anal fin and ventral to midlateral scales are steel blue; the blue coloration is most prominent in adult males. Oryzias woworae, the smallest known ricefish from Sulawesi, is hypothesized to be a member of an unnamed clade of ricefishes diagnosed by a truncate, rather than lunate or emarginate, caudal fin. Description of O. woworae brings the recognized number of species in the beloniform family Adrianichthyidae to 29, 13 of which are endemic to Sulawesi. Ricefishes, in particular the new species, may serve as icons to generate interest in conservation of the endemic freshwater biota of Sulawesi.

Fig. 2. Live adult female Oryzias woworae, center, with two adult males, photographed in the field just after collection. Original photograph has been reversed.

Holotype.—MZB 15398 (Fig. 3), male, 25.0 mm SL, Indonesia, Sulawesi Tenggara, Muna Island (Fig. 4), Regency of Muna, District Parigi, Village Wakumoro, Mata air Fotuno (Fotuno oe; Fig. 5), 5u04939.70S, 122u30925.70E, 13 September 2007, D. Wowor.

Etymology.— The trivial name woworae honors Daisy Wowor, a systematic carcinologist from the Museum Zoologicum Bogoriense, who collected specimens of the new species and had the foresight to take color photographs of the fish alive.

Distribution and habitat.— The single known collection of O. woworae was from the type locality, a freshwater stream with a canopy cover of about 80 percent and substrate of mud and sand with leaf litter (Fig. 5).

Fig. 3. Oryzias woworae, new species, MZB 15398, preserved holotype, male, 25.0 mm SL.

Fig. 4. Outline map of Sulawesi with southeastern region (in small box) expanded in larger box. Star indicates type locality of Oryzias woworae, new species.

Oryzias woworae, new species, Mata air Fotuno (Fotuno oe), a freshwater stream running through the Wakumoro Village, Parigi District, Muna Island.

A New, Remarkably Colorful, Small Ricefish of the Genus Oryzias (Beloniformes, Adrianichthyidae) from Sulawesi, Indonesia: http://si-pddr.si.edu/jspui/bitstream/10088/9776/1/vz_Parenti_and_Hadiaty_2010.pdf

[Ichthyology • 2010] Oryzias hadiatyae • new ricefish (Adrianichthyidae) endemic to Lake Masapi, Central Sulawesi, Indonesia

Oryzias hadiatyae - Holotype

ABSTRACT

A new species of ricefish is described from Lake Masapi, a small satellite lake of the Malili Lakes system in Central Sulawesi, Indonesia. Oryzias hadiatyae, new species, is known only from this single lake. It differs from all other adrianichthyids in Sulawesi in having a well marked concavity on the snout, a slender but relatively wide body with elongated snout and slightly upwardly directed mouth, pelvic fins with 5–6 fi n rays and anal fi n with 19–22 fi n rays, both inserting relatively close to the rear end of the body, dorsal fin with 8–10 rays inserted above 10–12th anal fi n ray, 28–30 vertebrae, only 27–31 lateral scales, dark brown blotches on the lateral body in adult males, and no blotches in females. This brings the number of ricefi sh species in Sulawesi to 16 (four Adrianichthys, 12 Oryzias), with four endemic lacustrine Oryzias in the Malili Lakes system. In addition, the riverine ricefi sh Oryzias celebensis, known so far only from Sulawesi’s southwestern arm and a single river in East Timor, is here reported for the fi rst time from a drainage in Central Sulawesi.

KEY WORDS. – Oryzias, taxonomy, Sulawesi, Malili Lakes, freshwater fish, endemism.

Oryzias hadiatyae, new species

(common name: Renny’s ricefish)

Material examined. –

Holotype - MZB 18491 (34.2 mm SL), male, Indonesia, Sulawesi: South Sulawesi Province; Larona drainage; Lake Masapi, southern shore between 2°50.837'S 121°21.116'E and the lake’s outlet, approx. 600 m westwards of this position; F. Herder, J. Pfaender, J. Schwarzer & R. K. Hadiaty 15–16 Apr.2004

Etymology. – The specific name, hadiatyae, honors Renny Kurnia Hadiaty who contributed significantly to the exploration of fi sh diversity in the Malili Lakes area. Renny also discovered this endemic ricefi sh in remote Lake Masapi.

Fig. 1. Map of the Malili Lakes system and adjacent drainages. Arrows highlight Lake Masapi, the type locality of endemic Oryzias hadiatyae with River Pongkeru draining the lake to River Larona, and Laroeha, sampling location of Oryzias celebensis at a tributary of Rivers Wewu / Cerekang.

Herder, F. and Chapuis, S. 2010. Oryzias hadiatyae, a new species of ricefish (Atherinomorpha:

Beloniformes: Adrianichthyidae) endemic to Lake Masapi, Central Sulawesi, Indonesia. The Raffles Bulletin of Zoology, 58: 269-280.: http://rmbr.nus.edu.sg/rbz/biblio/58/58rbz269-280.pdf

[Ichthyology • 2004] Adrianichthys roseni & Oryzias nebulosus, 2 new ricefishes (Adrianichthyidae) from Lake Poso, Sulawesi, Indonesia

Fig. 5. Oryzias nebulosus sp. nov., Lake Poso, Sulawesi Tengah, Indonesia, MZB 11649, holotype, male, 32.5 mm SL

Oryzias nebulosus sp. nov.

(English name: nebulous ricefish)

Abstract

Two new species of ricefishes or buntingi, Adrianichthys roseni and Oryzias nebulosus, are described from Lake Poso, Sulawesi Tengah, Indonesia, bringing to 12 the number of endemic ricefishes known from Sulawesi. Adrianichthys roseni and its sole congener, A. kruyti, are distinguished from other relatively large-bodied ricefishes, Xenopoecilus, in having orbits that project beyond the dorsal profile of the head; paired preethmoid cartilages (versus single or absent in Xenopoecilus); and 13–16 (versus 8–13) dorsal fin rays. Also, as in A. kruyti, the lower jaw of A. roseni is enclosed in the upper jaw when the mouth is closed; however, the upper jaw is not as large and broadly expanded as in A. kruyti. Adrianichthys roseni differs further from A. kruyti in having fewer scales in a lateral series (approximately 63–65 versus 70–75), attaining a smaller maximum recorded standard length (90 mm versus 109 mm), and having the lateral process of the pelvic bone in line with the fifth, rather than the eighth, pleural rib. Oryzias nebulosus shares with O. nigrimas, also from Lake Poso, a unique sexual dichromatism in preserved specimens: adult males are dark gray to black, whereas females are a lighter grayishyellow to brown. Relative to O. nigrimas, O. nebulosus is a small species (maximum recorded SL 33 mm versus 51 mm), with pelvic fins relatively anterior (lateral process of pelvic bone is in line with the third, fourth, or fifth, modally fourth, rather than the fourth or fifth, modally fifth, pleural rib), dorsal fin relatively anterior (origin above the 12–14th anal fin ray as opposed to the 15–17th anal fin ray), precaudal vertebrae 11–13, modally 12 (versus 13–14, modally 13), and relatively straight, narrow and slender (as opposed to curved, broad, and robust) ossified and cartilaginous portions of the gill arches. Endemic buntingi are threatened by introduction of exotic species, overfishing, and pollution. A conservation plan includes rearing native fishes for local use as ornamental fishes and possible reintroduction.

Key words: Ricefishes · Sulawesi · Buntingi · Adrianichthys roseni sp. nov. · Oryzias nebulosus sp. nov

Oryzias nebulosus sp. nov.

(English name: nebulous ricefish)

Holotype. MZB 11649, adult male, 32.5 mm SL. Lake Poso at Peura, eastern shore of lake approx. 10 km S of Tentena, Sulawesi Tengah, Indonesia, collected by L.R. Parenti, K.D. Louie, P. Beta, et al., 13 August 1995.

Etymology. The specific name nebulosus, misty or foggy, to connote a species previously unrecognized among the melanistic Oryzias in Lake Poso.

Fig. 2. Adrianichthys roseni sp. nov., Lake Poso, Sulawesi Tengah, Indonesia, MZB 6732 (ex. USNM 322424), holotype, female, 90 mm SL

Adrianichthys roseni sp. nov.

(English name: Rosen’s buntingi)

Adrianichthys kruyti (not of Weber); Rosen and Parenti, 1981: 16, Fig. 15b (Lake Poso, dorsal gill arch osteology); Parenti, 1989:80, Fig. 1 (Lake Poso, photo).

Holotype. MZB 6732 (ex. USNM 322424), gravid female, 90 mm SL, Lake Poso, Sulawesi Tengah, Indonesia, 4–5 September 1978, collected by N.J. Wilimovsky.

Paratype. USNM 322425, cleared and counterstained female, 73 mm SL, collected with the holotype.

Etymology. The specific name, roseni, honors the late Donn E. Rosen, in recognition of his enthusiasm, generosity, and enduring contributions to atherinomorph systematics.

Fig. 1. Map of Sulawesi, Indonesia, indicating type localities of the 12 endemic adrianichthyid species. Lake Poso, 7 endemics: Adrianichthys kruyti, Xenopoecilus oophorus, X. poptae, A. roseni sp. nov., O. nigrimas, O. nebulosus sp. nov., O. orthognathus; SW Sulawesi (Ujung Pandang), 1 endemic: Oryzias celebensis; Malili Lakes, 3 endemics: O.marmoratus, O. matanensis, O. profundicola; and Lake Lindu, 1 endemic: Xenopoecilus sarasinorum

Table 1. Ricefishes or buntingi, family Adrianichthyidae, known from Sulawesi

Parenti, L. R., and B. Soeroto. 2004. Adrianichthys roseni and Oryzias nebulosus, two new ricefishes (Atherinomorpha: Beloniformes: Adrianichthyidae) from Lake Poso, Sulawesi, Indonesia. Ichthyological Research. 51:10–19.: http://si-pddr.si.edu/dspace/handle/10088/10952

[Ichthyology • 1986] ปลาซิวข้าวสารแม่น้ำโขง | Oryzias mekongensis • a new ricefish from Mekong basin in Northeastern Thailand

ปลาซิวข้าวสารแม่โขง : Mekong Ricefish http://siamensis.org/content/5060

ปลาซิวข้าวสารแม่น้ำโขง | Oryzias mekongensis Uwa & Magtoon, 1986

• a new ricefish from Mekong basin in Northeastern Thailand

A new species of ricefish, Oryzias mekongensis, from the Mekong basin of northeast Thailand is described. It is characterized by a small size (11.5-14.0 mm SL) and 13-16 (modally 14) anal-fin rays. Live males have bright orange longitudinal subdistal stripes along upper and lower margins of caudal fin. The karyotype revealed 2n, 48 chromosomes consisting of 1 meta-, 4 submeta-, 12 subtelo- and 7 acrocentric pairs, the number of major arms (NF) being 58. Estimated DNA value was 1.5 pg per nucleus. This species is distinct from another small species, O. minutillus distributed in central, north and south Thailand, by morphological, karyotypical and reproductive differences. O. mekongensis belongs to the biarmed chromosome group which is distributed in east Asia; this species is most closely related to 0. curvinotus from Hainan Island. The new species having the smallest NF, is considered to be karyotypically most primitive among the members of the biarmed chromosome group so far studied.

Uwa, H. and Magtoon, W. 1986. Description and karyotype of a new ricefish, Oryzias mekongensis, from Thailand. Copeia, : 473-478.: http://www.jstor.org/stable/1445005