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Smithiana Bulletin
The South African Institute for Aquatic Biodiversity
ISSN: 1684-4130
No. 8, 2008, pp. 25-39
Bioline Code: sm08002
Full paper language: English
Document type: Research Article
Document available free of charge

Smithiana Bulletin, No. 8, 2008, pp. 25-39

 en New species of 'Barbus' and Labeobarbus (Teleostei: Cyprinidae) from the South Rukuru River, Malawi, Africa.
Tweddle, Denis & Skelton, Paul H.

Abstract

Two new barbine species are described from the South Rukuru River, which flows into Lake Malawi. ‘Barbusseymouri   check for this species in other resources sp. nov. differs from the ‘Beutaenia   check for this species in other resources / ‘B’. miolepis   check for this species in other resources species complex in the absence of the sheath of enlarged scales at the base of the dorsal fin, which is prominent in the other species of the complex, and in the pigmentation pattern of the mid-lateral stripe. Labeobarbus nthuwa   check for this species in other resources , sp. nov. differs from L. marequensis of the Middle and Lower Zambezi River system and from L. johnstonii of the Lake Malawi system in the presence of a bony dorsal spine, and from L. codringtonii of the Upper Zambezi in the absence of the tall dorsal fin. It also differs from L. johnstonii in scale counts, and from L. marequensis in gill raker counts and caudal peduncle proportions. The fish fauna of the South Rukuru River is separated from that of Lake Malawi and all other inflowing rivers by steep rift escarpment waterfalls. Evidence is presented for river capture from the Luangwa River, which flows to the Middle Zambezi. Other Zambezian species found on the northern Malawi lakeshore are considered to be evidence for a separate, former link to the Zambezi system via the Chambeshi system.

Keywords
new species, Lake Malawi, Luangwa River, river capture

 
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