|
Akysidae
The stream catfishes comprise the family Akysidae of catfishes. Distribution and habitat Akysids are known from across a large area in Southeast Asia. They are found in fresh water. Fish of the subfamily Parakysinae are primarily found in the Malay Peninsula, Sumatra, Sarawak, and western and southern Borneo. Most species are generally found in deeper parts of relatively swift rivers and forest streams. Taxonomy It includes at least 57 species in five genera; many species are only recently described. The family is divided into two subfamilies, Akysinae and Parakysinae. The Parakysinae had previously been listed as an independent family. This family is sister to a clade formed by Sisoridae, Erethistidae, and Aspredinidae. Description Akysids are small to minute fishes with cryptic colouration, tiny eyes, and completely covered with unculiferous plaques or tubercles. In some genera, some of the tubercles on the body are enlarged and arranged in distinctive longitudinal rows, the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akysis
''Akysis'' is the largest genus of catfishes (order (biology), order Siluriformes) of the family (biology), family Akysidae. Taxonomy In 1996, it was determined that ''Akysis'' is the cladistics, sister group to all other akysids, then only including ''Parakysis'', ''Acrochordonichthys'', and ''Breitensteinia''. However, it was acknowledged that the genus ''Akysis'' was poorly-sampled at the time and may be deemed non-monophyly, monophyletic in the future. In 1998, it was recognized that the large genus ''Akysis'' includes two species groups. The first species group was the ''Akysis variegatus'' group, for species more closely related to the biological type, type species; the other group was the ''pseudobagarius'' group for species more closely related to the formerly-named ''Akysis pseudobagarius''; the authors recognized it as conceivable that the groups represented two genera, but tentatively retained the species in a single genus. Since then, the genus ''Pseudobagarius'' was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |