Breitensteinia

Breitensteinia
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Siluriformes
Family:	Akysidae
Subfamily:	Parakysinae
Genus:	Breitensteinia Steindachner, 1881
Type species
Breitensteinia insignis Steindachner, 1881

Breitensteinia is a genus of catfishes (order Siluriformes) of the family Akysidae. It includes three species.

B. insignis was first described for an unusual akysid by Franz Steindachner in 1881. The genus had been monotypic since its description until a revision in 1998, along with the description of the two species B. cessator and B. hypselurus.

This genus stands out as derived among the akysids due to the large increase in vertebrae count.B. insignis and B. cessator are more closely related to one another than to B. hypselurus, the sister group to the clade formed by the former two species.

Breitensteinia species inhabit the middle and upper reaches of rivers in Borneo and Sumatra.B. cessator is known from the Batang Hari and Tulangbawan drainages in Sumatra and the Kapuas River drainage in western Borneo. B. hypselurus is known only from the Kapuas River basin in western Borneo. B. insignis comes from the Barito River drainage of southern Borneo.

Breitensteinia is a genus of akysid catfish lacking an adipose fin but having a long low adipose ridge, with a very long and slender caudal peduncle, with the gill openings not extending above the base of the pectoral spine, with 11–12 principal caudal-fin rays, and with 42–45 vertebrae. Like other akysids and unusually among catfish, they have a low principal caudal fin ray count and more rays in the upper caudal fin lobe than the lower. They have an elongate body, reflected by their high number of vertebrae which is eight to twelve more than in other akysid species, a clear sign of monophyly.

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