Silurichthys ligneolus, a new catfish (Teleostei: Siluridae) from southern Borneo, Indonesia (original) (raw)
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A revision of the South-east Asian catfish genus Silurichthys
Journal of Fish Biology, 1998
The taxonomy of the catfish genus Silurichthys is revised, and eight species are now recognized. A neotype is designated for S. hasseltii. Two new species are described: S. gibbiceps from the Barito basin in southern Borneo and S. marmoratus from north-western Borneo. Silurichthys leucopodus Fowler, 1939, is considered a subjective junior synonym of S. schneideri . The extent of the gape and the relative positions of the dorsal and pelvic fins show considerable infraspecific variation and are of little taxonomic value. The number of anal-fin rays is useful if used with other meristic data such as the number of vertebrae. Colour varies infraspecifically as individuals become paler and less mottled at night, but can still be used as a secondary character in separating some species. The head and caudal fin shapes are useful discriminating characters. Mature males are smaller than females and have prominent posterior serrae on the pectoral spine and articulated segments of the first pectoral-fin element. The shape and number of these serrae are also diagnostic for some species. 1998 The Fisheries Society of the British Isles
A New Species of Bagrid Catfish (Teleostei: Siluriformes) from Northern Sumatra
Mystus punctifer, new species, is described from the Alas River drainage in Aceh province, northern Sumatra. It can be distinguished from congeners in having the unique combination of the following characters: overall chocolate brown with relatively large and distinct humeral spot (and no other markings on sides of body or caudal peduncle); 4-8 serrations on posterior edge of dorsal spine; length of adipose-fin base 27.3-29.8 % SL; body depth at anus 21.9-25.8 % SL; length of caudal peduncle 16.6-18.0 % SL; depth of caudal peduncle 10.7-12.3 % SL; head length 26.7-28.1 % SL; snout length 36.5-38.9 % HL; interorbital distance 37.1-38.5 % HL.
Ompok platyrhynchus, a new silurid catfish (Teleostei: Siluridae) from Borneo
Ompok platyrhynchus, a new species of silurid catfish is described from the Temburong River drainage in Brunei Darussalam, northern Borneo. Ompok platyrhynchus can be distinguished from all Southeast Asian congeners, except for O. hypophthalmus, O. rhadinurus and O. urbaini, in having 74-80 (vs. 40-70) anal-fin rays. Ompok platyrhynchus differs from O. hypophthalmus, O. rhadinurus and O. urbaini in lacking a distinct nuchal concavity, having a more slender body (13.5-17.7% SL vs. 18.9-24.5), shorter snout (37.1-38. ) and maxillary barbels (reaching to middle of pectoral fin vs. reaching to anterior third of anal fin), and more vertebrae (59-60 vs. 47-58).
The catfishes (Teleostei: Siluriformes) of central Sumatra
Journal of Natural History, 2000
The freshwater and estuarine catfishes of c€ntral Sumatra draining to the Indian Ocean and between the Rokan and Batang Hari drainages are reported on the basis of literature records, museum matedal, and recent coilections. Eighty{wo species in l0 families are recorded from central Sumatra. Hemiba.grus wlox ar\d Nanobagrus stellatus are described here as new species. Akysis maoonema ard Clarias olivaceus are redescribed here K-eywonps: Hemibagus velox, Nanobagtus stel/at&r, Siluriformes, central Sumatra. biodiversitv. Family BAGRIDAE Bagichthys hypselopterus (Bleeker, 1852) Bagrus hypselopterus Bleeker, 1852d: 588 (tpe locality: Palembang, Sumatra). Bagrichthys hypselopterust Weber and d€ Beaufort, 1913: 346, figure 146 (in part); Kottelat et al., 1993: 63, pl.29. Mqterial examined. Brr,{Nc H.{Rr oRArN^cE: ZF.C 404'12 ( 1). 242.0 mm SL. ZRC 41532 (15), 166.1-279.5mm SL. ZRC 41898 (1), 208.8mm SL.
Clarias insolitus, a new species of clariid catfish (Teleostei: Siluri- formes) from southern Borneo
A new species of catfish in the genus Clarias is described from the Barito River drainage in southern Borneo. Clarias insolitus can be clearly distinguished from all other Southeast Asian Clarias species in having a long and thin anterior fontanel and hypertrophied sensory canal pores on the head and body that are easily visible to the naked eye. Additional diagnostic characters not unique to this species are a uniform violet-gray color without any white spots on body and prominent serrations on the anterior edge of the pectoral spine.
A new species of the catfish genus Akysis (Siluriformes: Akysidae) from southern Borneo
A new species of akysid catfish, Akysis meridionalis, is described from the Barito River drainage of southern Borneo. The new species is distinguished from all congeners by the following combina- tion of characters: 1) upper jaw projects more strongly forward, premaxillary teeth exposed when the mouth is closed; 2) head width 18.2-19.4 % SL, body depth at anus 10.7-11.5 % SL, depth of caudal peduncle 6.5-6.7 % SL, interorbital distance 32-34 % HL, length of maxillary barbels 104- 110 % HL; 3) presence of 5 teeth on posterior edge of the pectoral spine; and 4) colour pattern of dark background with light patches. Akysis meridionalis is the first record of the genus from the Barito River drainage.
Parakysis notialis , a new species of akysid catfish from Borneo (Siluriformes: Akysidae
Ichthyological Research, 2003
Parakysis notialis sp. nov. is described from the Barito River drainage in southern Borneo. It can be distinguished from congeners in having a unique combination of the following characters: head length 26.5–27.0% SL, conical head, presence of median concavity on margin of lower lip, presence of laterosensory canal pore between inner and outer mandibular barbels, branched outer mandibular barbels, branches of inner mandibular barbels separated, deeply forked caudal fin with pointed lobes, 5 pectoral fin rays, 10 branched principal caudal fin rays, sparsely pigmented caudal fin, and absence of light brown saddle from base of posteriormost dorsal fin ray to caudal peduncle.
Oreoglanis macronemus, new species, is described from the Xieng Khouang Plateau (Plain of Jars) in northern Laos. It belongs to the O. delacouri species group (sensu Ng & Rainboth), which consist of species with a lower lip lacking a median notch and with prominent projections along the posterior margin, as well as a lunate caudal fin with extensions of the outermost principal caudal rays. Oreoglanis macronemus can be distinguished from other members of the O. delacouri species group in having a short caudal peduncle (15.6-17.3% SL) and very long nasal barbels (35.4-41.7% HL).
Journal of Fish Biology, 2003
The identities of the nominal species in the Ompok hypophthalmus group of silurid catfishes, namely Ompok hypophthalmus, O. macronema and O. urbaini are verified in this study. Ompok macronema is hypothesized to be a junior synonym of O. hypophthalmus, and O. urbaini (previously considered a junior synonym of O. hypophthalmus) is hypothesized to be valid, distinct species. Ompok hypophthalmus is restricted to Java and the Barito River drainage in southern Borneo, and the material previously identified as O. hypophthalmus from Sumatra, the Malay Peninsula and Borneo represents O. rhadinurus, a new species.