Akysis

Akysis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Siluriformes
Family:	Akysidae
Subfamily:	Akysinae
Genus:	Akysis Bleeker, 1858
Type species
Pimelodus variegatus Bleeker, 1846

Akysis is the largest genus of catfishes (order Siluriformes) of the family Akysidae.

In 1996, it was determined that Akysis is the 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-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 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 erected for this species group, leaving only members of the A. variegatus group in the genus Akysis.

In 2007, Laguvia manipurensis was redescribed to the genus Akysis as part of the A. variegatus group.

There are currently 24 recognized species in this genus:

These fish are found in fast-flowing streams in Southeast Asia. This area is bordered by the Irrawaddy River drainage to the west, the Barito River drainage to the east, the Lancangjiang (upper Mekong) drainage to the north, and the Citarum River drainage to the south.Akysis have been reported from Java, Sumatra, Borneo, Tenasserim, Thailand, Myanmar, and, most recently, the distribution of Akysis has been discovered to include India.

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