Results for “congener”

This species is now considered endemic to Java but has been confused with the congeners H. gracilis (from eastern Peninsular Malaysia), H. velox (Sumatra) and H. bongan (Borneo) in the past, while the population formerly considered to inhabit northwestern Peninsular Malaysia has been described as H. divaricatus (Ng and Kottelat, 2013).

This species is relatively common in the aquarium trade but has been widely misidentified as the congener H. nemurus which is native to Java and may never have been exported for ornamental purposes. Hemibagrus has been divided into a number of putative species groups which may or may not rep...

This rarely-traded species is a member of the H. ocellata 'group' of closely-related congeners, an assemblage which currently comprises H. ocellata, H. bilineata, H. confuzona, H. orthogoniata, H. ogilviei and H. parclitella. Following Tan and Ng (2005) these share possession of a colour pattern with reddish tints and dark brown head markings, elongate head, slightly compressed body, 61-77 lateral line scales and dorsal-fin origin placed in advance of pelvic-fin origin.

This species may be referred to using a variety of names including 'scomb', 'sabre tooth tetra', 'sabre tusk barracuda', 'dog tooth characin, 'vampire fish', 'Cachorra' or Pirandirá (the latter two names being used in Brazil where they're also applied to congeners). It's regularly confused with the payara, H. armatus, though that species grows considerably larger, is pop...

The differences in pelvic-fin structure and gill openings led Roberts to redefine the genus when describing H. eubranchus, whereas Tan (2006) expressed doubts that the two are even congeneric but was unable to reach a definitive conclusion in the absence of fresh material. At any rate both species can be easily differentiated from Gastromyzon and Neogastromyzon spp. by observing the mo...

Widely-distributed throughout much of the Paraná and Uruguay river systems in Brazil, Paraguay, Argentina and Uruguay. Some records from Buenos Aires province, Argentina are now considered to refer to the congener H. togoi (Miquelarena and López, 2006) so the common vernacular name 'Buenos Aires tetra' may not...

This species is available on a relatively regular basis, although it's sometimes confused with the similar-looking congeners H. loretoensis and H. metae. It can be identified via the following combination of characters as per Géry (1977): elongate in shape with body depth fitting 3.8-3.9 times in its standard length; caudal peduncle narrow, its depth fitting 1.8 times in its length; head short, interorbital broad, snout short and rounded; dorsal-fin insertion an...

This small species is a popular aquarium fish but there is some confusion surrounding its identity. Two colour forms have been traded, one of which also possesses tiny hooks on the fin rays. It can be distinguished from congeners by colour pattern; the body is rose-coloured, fins red with no black markings, and the ovoid humeral spot is prominent, measuring around half of the body depth.

This undescribed species is part of the Hypostomus cochliodon complex, all of which were previously included in the genus Cochliodon. This is now considered a synonym of Hypostomus. Members of this group can be distinguished from congeners by several differences in morphology, most notably the hump-backed profile of mature fish and spoon-shaped dentition. These features, along with the fishes tendency to eat wood, are shared with the Panaque genus of the Ancistrinae subfamily, but the two genera...

This species is part of the Hypostomus cochliodon complex, all of which were previously included in the genus Cochliodon, which is now considered a synonym of Hypostomus. Members of this group can be distinguished from congeners by several differences in morphology, most notably the hump-backed profile of mature fish and spoon-shaped dentition. These features, along with the fishes tendency to eat wood, are shared with the Panaque genus of the Ancistrinae subfamily, but the two genera are known ...

This undescribed species is part of the Hypostomus cochliodon complex, all of which were previously included in the genus Cochliodon, which is now considered a synonym of Hypostomus. Members of this group can be distinguished from congeners by several differences in morphology, most notably the hump-backed profile of mature fish and spoon-shaped dentition. These features, along with the fishes tendency to eat wood, are shared with the Panaque genus of the Ancistrinae subfamily, but the two gener...

Supposedly exported from the upper Amazon region in Peru but precise details are lacking. It's unclear whether this unidentified species is conspecific with the similarly nameless congener L266 or not.

This undescribed species is part of the Hypostomus cochliodon species complex, all members of which were previously included in the genus Cochliodon, now considered a synonym of Hypostomus. Members of this group can be distinguished from congeners by several differences in morphology, most notably the hump-backed profile of mature fish and spoon-shaped dentition. These features, along with the fishes tendency to eat wood, are shared with the Panaque genus of the Ancistrinae subfamily, but the tw...

H. malcolmi is distinguished from congeners by the following combination of characters: 12-17 (usually 14-15) rakers on first gill arch; usually 16 circumpeduncular scale rows; less than 30 lateral line scales; some branched lateral line canals, but branching not extensive, median portion of dorsal-fin dark.

H. wetmorei is distinguished from congeners by the following combination of characters: upper body reddish brown; robust body, not compressed; usually 4½ scale rows between lateral line and dorsal-fin origin; 8-12 rakers on first gill arch; 7-9 predorsal scales; 14 circumpeduncular scale rows; usually two scale rows separating vent and anal-fin; <29 lateral line scales; 9-14 serrations on the spinous dorsal-fin ray; distance between distal serrae on posterior margin of last unbranched dorsal-fin ray much greater than the width of their bases.

I. geisleri is typically exported for the aquarium trade alongside the similar-looking congener I. adujai (Géry, 1970) but can be identified by presence (vs. absence in I. adujai) of a black lateral stripe on the body beneath the red stripe, and possession of 20-25 (vs. 28-34) anal-fin rays.

This species is rare in the aquarium hobby though its name is often misapplied to the closely-related I. crocodilus. It can be told apart from congeners by the following characters: dorsal and anal fins without dark markings, with a light brown bar in breeding males; ventral surface light brown; throat white, occasionally with a few brown spots; ridges of head bones weakly serrated or not serrated, depending on the bone. The family Indostomidae currently contains just a single genus with three species of which I. paradoxus is the type. It was raised alongside both family...

It's most easily told apart from K. brevifasciata, its only congener, by body patterning consisting of dark, vertical bars running along the dorso-ventral part of the body (vs. dark bars running alongside the midventral part of the body), lips with wrinkled surfaces (vs. smooth) and barbels short (vs. long).

This little-known, relict species possesses some unique morphological and behavioural traits when compared with its congeners and the genus Kosswigichthys was erected for it in the original description. It has a much more elongate body profile than other Aphanius spp., almost total absence of scalation on the body and three rows of conical (as opposed to tricuspid in all other species) teeth which set it apart. Work by Franz and Villwock in the 1970s revealed it to be a member of Aphanius and showed ...

This species differs from congeners in the presence of papillae covering the mouthparts (lips, barbels, and lobes) which are absent in other species. It's also the largest species in the genus and the serrae on the second pectoral fin rays in males form a broa...