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Systematic revision of the formerly monotypic genus Tanganikallabes

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Posted 21 April 2012 - 04:00 PM

The Linnean Society of London, Zoological Journal of the Linnean Society , 2012,

Systematic revision of the formerly monotypic genus Tanganikallabes (Siluriformes: Clariidae)

Jeremy J. Wright and Reeve M. Bailey.

The monotypic genusTanganikallabes , endemic to Lake Tanganyika, is a poorly known member of the family
Clariidae. Examination of 142 specimens housed in museum collections has revealed the presence of at least two
additional species in this genus. Tanganikallabes albopercasp. nov. is distinguished from all congeners by the
length of its pelvic fins, the presence of a depigmented vertical bar on the opercular margin, and a combination
of additional morphometric (pectoral spine length, preanal length, body depth at anus) and meristic (dorsal and
anal fin ray counts) characters. Tanganikallabes stewartisp. nov. is distinguished from other Tanganikallabes
species by having a relatively shorter, incomplete lateral line, and shallow body depth at the anus, as well as
shorter prepelvic and preanal lengths, and a longer anal fin with a higher number of fin rays. Several
morphological characters, as well as genetic data from cytochrome b (mitochondrial DNA) and 18S –ITS1–5.8S–
ITS2–28S (ribosomal DNA), indicate that Tanganikallabes constitutes a monophyletic group within the Clariidae
and support the recognition of additional species diversity. The monophyly of Tanganikallabes , coupled with the
geographical isolation of this group to a single lake satisfy the requirements for its classification as a true species
flock, the latest to be described from Lake Tanganyika.

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