Acrochordonichthys gyrinus, a new species of akysid catfish (Teleostei: Siluriformes) from Thailand

Zootaxa ◽  
2003 ◽  
Vol 183 (1) ◽  
pp. 1 ◽  
Author(s):  
CHAVALIT VIDTHAYANON ◽  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Species Group ◽  
Unique Combination ◽  
Maximum Width ◽  
Body Depth ◽  
Adipose Fin ◽  
Chao Phraya River ◽  
A New Species

Acrochordonichthys gyrinus, a new species of akysid catfish belonging to the A. ischnosoma species group, is described from the Chao Phraya River drainage in Thailand. It can be distinguished from congeners by a concave posterior margin of the pectoral fin and the unique combination of the following characteristics: head depth 9.8–11.4% SL; dorsal to adipose distance 7.4–8.6% SL; body depth at anus 8.3–10.5% SL; maximum width of humeral process 16.3% its length; and anterior margin of anal fin and posterior margin of adipose fin straight. This species represents the northernmost distribution of the genus.

Leiocassis rudicula (Teleostei: Siluriformes: Bagridae), a new catfish from eastern Borneo

Zootaxa ◽  
2019 ◽  
Vol 4651 (1) ◽  
pp. 191-200
Author(s):  
HEOK HEE NG ◽  
RENNY K. HADIATY
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Unique Combination ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Dorsal Fin ◽  
Brown Band ◽  
Eye Diameter ◽  
Adipose Fin ◽  
A New Species

A new species of bagrid catfish in the genus Leiocassis is described from the Mahakam River drainage in eastern Borneo. Leiocassis rudicula, new species, can be distinguished from congeners in having a unique combination of: distinct concavity at level of orbit in dorsolateral profile of head; tip of supraoccipital spine not reaching anterior nuchal plate element; smooth posterior margin of dorsal spine; presence of an irregular pale band on sides of body between dorsal and adipose fins; anal fin with narrow brown band across middle third of fin; narrow caudal-fin lobes with nearly straight posterior margins; snout length 36–40% HL; eye diameter 14–20% HL; head depth 17.6–20.0% SL; length of dorsal-fin spine 14.1–18.5% SL; length of pectoral-fin spine 15.1–17.7 %SL; dorsal-to-adipose distance 10.9–14.3% SL; body depth at anus 16.4–19.5% SL; length of adipose-fin base 18.9–24.1% SL; length of anal-fin base 18.8–22.6% SL; and caudal peduncle depth 9.1–10.9% SL. A revised key to the genus is also provided. 

scholarly journals Akysis longifilis, a new species of catfish (Teleostei: Akysidae) from Myanmar

Zootaxa ◽  
2006 ◽  
Vol 1150 (1) ◽  
pp. 19 ◽  
Author(s):  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Species Group ◽  
Head Width ◽  
Posterior Edge ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Pectoral Spine ◽  
Adipose Fin ◽  
Peduncle Length ◽  
A New Species

Akysis longifilis, new species, is described from the Sittang River drainage in Myanmar. It is a member of the A. variegatus species group and can be distinguished from congeners in the group (except for A. brachybarbatus, A. fuliginatus, A. pictus, A. prashadi, A. variegatus, A. varius and A. vespa) in having a smooth (vs. serrated) posterior edge of the pectoral spine. It is distinguished from A. brachybarbatus, A. fuliginatus, A. pictus, A. prashadi, A. variegatus, A. varius and A. vespa in having a unique combination of: length of adipose-fin base 25.7–31.1% SL, body depth at anus 9.7–13.6% SL, caudal peduncle length 18.3–23.2% SL, caudal peduncle depth 5.6–7.2% SL, head width 21.1–24.7% SL, nasal barbel length 67.4–96.4% HL, maxillary barbel length 123.2–159.6% HL, vertebrae 33–35, body with light saddle-shaped spots, and caudal fin forked.

A new species of miniature catfish from the Malay Peninsula (Teleostei: Bagridae: Nanobagrus)

Zootaxa ◽  
2010 ◽  
Vol 2677 (1) ◽  
pp. 60 ◽  
Author(s):  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Malay Peninsula ◽  
Body Depth ◽  
Transverse Band ◽  
Pectoral Spine ◽  
Adipose Fin ◽  
Brown Body ◽  
First Time ◽  
A New Species

Nanobagrus lemniscatus, a new species of miniature bagrid catfish from the Malay Peninsula is described here. It can be distinguished from congeners in having the following combination of characters: large cream patches on a brown body frequently coalescing to form broad transverse band, length of adipose-fin base 24.0–27.1% SL, body depth at anus 13.1–14.0% SL, 35–36 vertebrae, pectoral spine with length 16.1–18.7% SL and 7–9 serrations on its posterior margin, and a convex neurocranium. Nanobagrus stellatus is also recorded from the Malay Peninsula for the first time in this study.

scholarly journals Chrysobrycon yoliae, a new species of stevardiin (Characiformes: Characidae) from the Ucayali basin, Peru

2014 ◽  
Vol 12 (2) ◽  
pp. 291-300 ◽  
Author(s):  
James Anyelo Vanegas-Ríos ◽  
María de las Mercedes Azpelicueta ◽  
Hernán Ortega
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
The Body ◽  
Pelvic Bone ◽  
Body Depth ◽  
Dorsal Fin ◽  
Fin Rays ◽  
Adipose Fin ◽  
Fin Length ◽  
A New Species

Chrysobrycon yoliae, new species, is described from a drainage flowing into the río Yucamia basin, río Ucayali basin, Peru. Chrysobrycon yoliaeis readily distinguished from its congeners by the anterior tip of pelvic bone situated anterior to the fifth rib (vs. situated posterior to the fifth rib), the presence of 20-26 dentary teeth (vs. 11-19), and the possession of a terminal lateral-line tube between caudal-fin rays 10 and 11 (vs. the absence of this tube, except in C. eliasi). The new species differs from C. eliasiand C. myersiby the presence of teeth on third pharyngobranchial (vs. the absence of teeth on this bone) and also differs from C. eliasiby the dorsal-fin origin situated at vertical through anal-fin rays 5 to 7 (vs. located at vertical through anal-fin rays 8 to 10), the posterior extent of the ventral process of quadrate reaching the vertical through posterior margin of symplectic (vs. not reaching the vertical through posterior margin of symplectic), the dorsal-fin to adipose-fin length 26.8-28.8% SL (vs. 23.9-26.8% SL), and the body depth at dorsal-fin origin 34.4-42.2% SL (vs. 24.1-34.5% SL). A key for the identification of Chrysobryconspecies is provided.

A new, uniquely patterned spiny eel (Teleostei: Mastacembelidae) from southern Borneo, Kalimantan Tengah, Indonesia

Zootaxa ◽  
2020 ◽  
Vol 4819 (1) ◽  
pp. 170-178
Author(s):  
HEOK HEE NG ◽  
HEOK HUI TAN
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Species Group ◽  
Unique Combination ◽  
Body Depth ◽  
Anterior Nostril ◽  
Dorsal Fin ◽  
Brown Stripe ◽  
Fin Rays ◽  
A New Species

A new species of Macrognathus of the M. aculeatus species group is described from the Kahayan River drainage in southern Borneo, Kalimantan Tengah, Indonesia. Macrognathus kris, new species, is distinguished from all Asian congeners in having the following unique combination of characters: rim of anterior nostril with two fimbriae and two fimbrules; 43–45 rostral tooth plates; 24–25 dorsal spines; 46–55 dorsal-fin rays; 51–59 anal-fin rays; 20–23 principal caudal-fin rays; 76–78 total vertebrae; body depth at anus 11.8–15.9% SL; color pattern consisting of light brown stripe on dorsum and 11–14 irregular pentagonal dark brown blotches on sides of body.

scholarly journals Microglanis carlae, a new species of bumblebee catfish (Siluriformes: Pseudopimelodidae) from the río Paraguay basin in Paraguay

2008 ◽  
Vol 6 (3) ◽  
pp. 425-432 ◽  
Author(s):  
Héctor S. Vera Alcaraz ◽  
Weferson J. da Graça ◽  
Oscar A. Shibatta
Keyword(s):  
New Species ◽  
Species Complex ◽  
Anterior Margin ◽  
Color Pattern ◽  
Caudal Peduncle ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Pectoral Spine ◽  
Adipose Fin ◽  
A New Species

Microglanis carlae, new species, is described from the río Paraguay basin and distinguished from its congeners by the following combination of characters: paired and anal fins mottled or with thin faint bands, trunk with dark-brown saddles, anterior margin of pectoral spine with serrations retrorse proximally and antrorse distally, tip of pectoral spine as a distinct bony point, continuous portion of lateral line reaching vertical through last dorsal-fin ray, caudal peduncle with irregularly shaped, faint to dark blotch, maxillary barbel surpassing vertical through dorsal-spine origin, and dark bar on posterior flank continuous from base of adipose fin to that of anal fin. The new species is included in the Microglanis parahybae species complex on the basis of color pattern.

scholarly journals Iheringichthys syi (Siluriformes: Pimelodidae), a new pimelodid species from upper Paraná basin, Brazil

2012 ◽  
Vol 10 (1) ◽  
pp. 45-52
Author(s):  
María de las Mercedes Azpelicueta ◽  
Heraldo A. Britski
Keyword(s):  
New Species ◽  
Standard Length ◽  
Anterior Margin ◽  
Head Length ◽  
Dorsal Fin ◽  
Eye Diameter ◽  
Paraná Basin ◽  
Adipose Fin ◽  
Parana Basin ◽  
A New Species

We describe a new species of pimelodid catfish of the genus Iheringichthys from the upper Paraná basin, Brazil. Iheringichthys syi n. sp. is distinguished by the comparatively fine serration along the anterior margin of the pectoral-fin spine, an adpressed dorsal-fin remote from the adipose-fin origin, a large eye (23.2-31.2% of head length), narrow interorbital (16.2-23.0% of head length), long snout (42.0-51.0% of head length), long postorbital length (30.6-34.0% of head length), low adipose fin (4.8-7.8% of standard length), eye diameter 97.0-140.0% of interorbital length, and body with numerous, small dots irregularly scattered on flanks, especially marked on anterior half of flank.

Pseudobagarius eustictus, a new species of catfish from northern Laos (Siluriformes: Akysidae)

Zootaxa ◽  
2021 ◽  
Vol 4996 (2) ◽  
pp. 322-330
Author(s):  
HEOK HEE NG ◽  
MAURICE KOTTELAT
Keyword(s):  
New Species ◽  
The Body ◽  
Head Width ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Lower Jaw ◽  
Pectoral Spine ◽  
Eye Diameter ◽  
Adipose Fin ◽  
A New Species

Pseudobagarius eustictus, new species, is described from the Nam Heung drainage (a tributary of the Mekong River) in northern Laos. It is distinguished from congeners in having a unique combination of the following characters: a weakly-produced snout in which the upper jaw extends only slightly beyond the margin of the lower jaw when viewed ventrally, 3 tubercles on the posterior margin of the pectoral spine, eye diameter 8% HL, head width 24.1% SL, dark yellow dorsal and lateral surfaces of the head, pectoral spine lacking elongate extensions, pectoral fin reaching the pelvic-fin base when adpressed against the body, dorsolateral surfaces of body without longitudinal series of prominent tubercles, body depth at anus 13.7% SL, length of adipose-fin base 17.7% SL, caudal-peduncle depth 7.0% SL, and 33 vertebrae.  

Exostoma kottelati, a new species of catfish (Teleostei: Sisoridae) from Arunachal Pradesh, India

Zootaxa ◽  
2019 ◽  
Vol 4585 (2) ◽  
pp. 369 ◽  
Author(s):  
ACHOM DARSHAN ◽  
WAIKHOM VISHWANATH ◽  
SANTOSHKUMAR ABUJAM ◽  
DEBANGSHU NARAYAN DAS
Keyword(s):  
New Species ◽  
River Basin ◽  
Arunachal Pradesh ◽  
Brahmaputra River ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Brahmaputra Basin ◽  
Adipose Fin ◽  
Peduncle Length ◽  
A New Species

Exostoma kottelati, new species, is described from the Ranga River, Brahmaputra basin, in Arunachal Pradesh state, northeastern India. It differs from congeners in the Brahmaputra River basin in having a longer adipose-fin base (33.4–36.0 % SL vs. 23.4–32.9), a greater (except E. mangdechhuensis) pre-pelvic length (45.6–47.3 % SL vs. 39.3–44.6) and a greater pre-anal length (73.9–76.5 % SL vs. 62.2–70.1). It further differs from all known congeners by the following unique combination characters: the adipose fin is distinctly separated from the dorsal procurrent caudal-fin rays, pre-dorsal length 38.9–41.7% SL, adipose-fin base length 33.4–36 % SL, caudal peduncle length 18.7–21.1 % SL, caudal peduncle depth 8.8–9.5 % SL, and body depth at anus 12.5–13.5 % SL. This is the fifth species of Exostoma known from the Brahmaputra River basin. 

scholarly journals A new species of the genus Pimelodus La Cépède, 1803 from the rio Iguaçu basin and a reappraisal of Pimelodus ortmanni Haseman, 1911 from the rio Paraná system, Brazil (Ostariophysi: Siluriformes: Pimelodidae)

2007 ◽  
Vol 5 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Julio Cesar Garavello ◽  
Oscar Akio Shibatta
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Head Length ◽  
Santa Catarina ◽  
Body Depth ◽  
Type Series ◽  
Adipose Fin ◽  
A New Species

A new species, Pimelodus britskii, is described from the rio Iguaçu in the rio Paraná drainage, on the border of Paraná and Santa Catarina states, Brazil. Specimens of this species were wrongly included in the type series of Pimelodus ortmanni. Pimelodus britskii is distinguished from its congeners by color pattern, having circular dark brown blotches usually smaller than one orbital diameter, regularly and scattered along the trunk. Differs from P. ortmanni by the following characters: body depth at posterior cleithral process greater than head length; lips not prominent; and maxillary barbel reaching or surpassing vertical drawn through median of adipose fin. Pimelodus britskii represents the second species of the genus Pimelodus from the rio Iguaçu basin.

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