This glossary of ichthyology is a list of definitions of terms and concepts used in ichthyology, the study of fishes.
The greenback flounder is a righteye flounder of the genus Rhombosolea, found around southern Australia and New Zealand.
The ornate dogfish is dogfish shark which is not widely known. It is found in deepwater on the continental slopes of the Indian Ocean, the Arabian Sea and the Bay of Bengal, at depths between 520 and 1,260 m. Its length is up to 30 cm, and its reproduction is ovoviviparous.
The longnose sawtail catshark is a little-known species of catshark, part of the family Scyliorhinidae, found off the northwestern Pacific islands of Amami Ōshima, Ogasawara, and Izu at depths of 350–550 m (1,150–1,800 ft). Reaching a length of 80 cm (31 in), it is characterized by a long flattened snout, a long space between the pelvic and anal fins, and a crest of enlarged dermal denticles along the dorsal caudal fin edge. Adults are plain dark gray above, while juveniles have a few faint dark saddles on the back and tail.
The blacktip sawtail catshark is a species of catshark, and part of the family Scyliorhinidae, found off the coasts of Taiwan and the Philippines. It is demersal in nature and occurs deeper than 60 m (200 ft). Growing up to 46 cm (18 in) long, this slim-bodied species is characterized by its plain brownish dorsal coloration with dark tips on the dorsal and caudal fins, and a prominent crest of enlarged dermal denticles on the upper edge of the caudal fin. It is oviparous, with females producing encapsulated eggs two at a time year-round. The blacktip sawtail catshark is caught incidentally in bottom trawls and used for fishmeal in Taiwan.
The northern sawtail catshark is a little-known species of catshark, and part of the family Scyliorhinidae, endemic to northeastern Australia. It is demersal in nature and inhabits the upper continental slope at a depth of 300–420 m (980–1,380 ft). A small, slender species growing no longer than 42 cm (17 in), the northern sawtail catshark is characterized by a series of dark, narrow saddles along its back and tail, and rows of prominently enlarged dermal denticles along the upper edge of its caudal fin and the underside of its caudal peduncle. The International Union for Conservation of Nature (IUCN) does not yet have enough information to assess its conservation status.
Cetopsidium is a genus of catfishes of the family Cetopsidae.
Paracetopsis is a genus of whale catfishes found in tropical South America.
Denticetopsis is a genus of catfishes of the family Cetopsidae.
Acrochordonichthys is a genus of catfishes of the family Akysidae. It includes ten species.
Enteromius ablabes is a species of ray-finned fish in the genus Enteromius. It occurs in West Africa from the Sahel to the coast between Guinea and Nigeria, south to the central Congo Basin. The relationship of E. ablabes to other Enteromius is uncertain. Tsigenopoulos et al. (2002) found it to be sister to E. macrops. Yang et al. (2015) using the same sequence found it to be sister to E. anema, and Hayes et al. (2017) found the Tsigenopoulos et al. specimen to be sister to E. anema + E. cf. guildi and newly sequenced specimens from Guinea to be sister to be in a clade with a specimen of E. punctitaeniatus and that clade sister to E. bigornei and E. foutensis. The Tsigenopoulos et al. specimen is from Ivory Coast, but a catalog number is not provided to check identity. Enteromius punctiteniatus is a species very similar in appearance to E. ablabes, differing by having 9 circumpeduncular scales vs. 12. Enteromius ablabes is likely polymorphic with one species already described from within it. This description conforms to the current hypothesis on the identity of E. ablabes; however, the species will need to be examined in greater detail to determine if there are multiple species present.
Cirrhibarbis capensis, the barbelled klipfish, is a species of clinid found in subtropical waters of the Atlantic Ocean around South Africa. This species can reach a maximum length of 36 centimetres (14 in) TL. This species preys primarily on benthic crustaceans, mostly amphipods and isopods. It is currently the only known member of its genus.
Climacoporus navalis, the fleet klipfish, is a species of clinid found in subtropical waters of the Atlantic Ocean along the coast of South Africa where it can be found in tide pools. This species can reach a maximum length of 7 centimetres (2.8 in) TL. It is currently the only known member of its genus.
Clinoporus biporosus, the ladder klipfish, is a species of clinid found in subtropical waters of the Atlantic Ocean around the South African coast. It occurs in the subtidal zone down to a depth of 30 metres (98 ft). This species can reach a maximum length of 13 centimetres (5.1 in) TL. It is currently the only known member of the genus Clinoporus.
Blennophis anguillaris, the snaky klipfish, is a species of clinid found in the subtropical waters of the Atlantic Ocean around South Africa. It can be found in the subtidal zone and also is a denizen of tidepools. This species can reach a maximum length of 30 centimetres (12 in) TL.
Blennophis striatus, the Striped klipfish, is a species of clinid found in the subtropical waters of the Atlantic Ocean from Saldanha Bay to East London, South Africa where it can be found in the subtidal zone as well as inhabiting tidepools. This species can reach a maximum length of 17.5 centimetres (6.9 in) TL.
Clinus brevicristatus, the Cape klipfish, is a species of clinid that occurs in subtropical waters of the Atlantic Ocean around South Africa where it prefers habitats with plentiful growth of seaweed. This species can reach a maximum length of 12 centimetres (4.7 in) TL.
Astyanax microschemos is a species of characid fish from Brazil. It belongs to the A. scabripinnis species complex and differs from other species outside it by having a lower number of branched anal fin rays and its shallow body depth being about 26.9-29.7 vs more than 35% of its standard length (SL). Compared to species of its own complex, it can be distinguished by the combination of its shallow body depth, and smaller interorbital width. The species name comes from the Greek mikroschemos, meaning "low stature", which refers to the shallow body depth of the animal.
Deuterodon pelecus is a species of characid fish from Brazil. It can be distinguished from other species by: its body depth ; its short and pointed snout smaller than the orbital diameter; and a reduced number of branched anal fin rays. D. pelecus also differs from members of its genus by its characteristic color pattern. It possesses a single humeral spot that is constricted to the region above the lateral line; at the same time it shows a conspicuous midlateral body stripe from opercle to the caudal fin base, an autapomorphy of this precise species. Other Deuterodon species have a humeral spot that is vertically or horizontally elongate and have the midlateral stripe becoming faint near that humeral spot. The species name is derived from the Greek pelekus, meaning "axe", referring to the pigmentation shape resulting from the adjoinment of the humeral spot with the midlateral stripe.
Guyanancistrus nassauensis is a species of catfish belonging to the family Loricariidae, the suckermouth armored catfishes. It is discovered in 2005 and formally described in 2018. G. nassauensis is a rare species, highly endemic to the Nassau Mountains in Suriname, and is threatened with extinction by proposed or ongoing mining activities.
