[New Species] Systomus navjotsodhii

[Trichopsis]

Systomus navjotsodhii, a new cyprinid fish from Central Kalimantan, Borneo. H. H. Tan. [PDF]

A deep-bodied tiger barb with broad black bars is described from hill stream habitats in the headwaters of the Katingan River in Central Kalimantan, Borneo. Systomus navjotsodhii differs from other tiger barbs in having four complete broad black bars and the deepest body (body depth at dorsal-fin origin 53.6–59.2 % SL). The species is named in memory of Navjot Sodhi.

A.
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B.
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Systomus navjotsodhii: A, a pair near the rocky substratum; B, male near submerged river bank vegetation. In-situ photographs in type location, a hill stream habitat (Aug.2007)

A.
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B.
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C.
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Systomus navjotsodhii: A, MZB 17198, holotype, 41.7 mm SL, life colour; B, ZRC 52509, 47.8 mm SL male; C, ZRC 52509, 42.4 mm SL female; Kalimantan Tengah: Katingan.

[Trichopsis]

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ZRC 52509, 21.1 mm SL juvenile; Kalimantan Tengah: Katingan.

Systomus navjotsodhii is currently only known from both the upper Katingan and Barito river basins in Central Kalimantan, Borneo.

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Hill stream habitat (type locality, 00°44.91'S, 112°15.85'E) of Systomus navjotsodhii (Aug.2007).

Two groups of tiger barbs as first recognised by Kottelat (1992), the subspecies proposed by Alfred (1963) are recognised as full species by Kottelat (1992) and followed herein. Group 1 possesses a deep rhomboidal, usually yellow body with intense black bars and a complete or incomplete lateral line, occurring in swamps, streams, and along river margins. This group 1 comprises of four species: Systomus tetrazona (Bleeker, 1855) from Sumatra; S. anchisporus (Vaillant, 1902) from Borneo (West and Central Kalimantan); S. partipentazona (Fowler, 1934) from Peninsular Malaysia, Thailand, Cambodia, and Vietnam; and S. pulcher (Rendahl, 1922) from Borneo (East Kalimantan; revalidated recently by Kottelat & Tan, 2011). Members of Group 2 have a shallower, elongated, reddish-brown body with blackish-brown bars (complete or incomplete), complete lateral line, and occur in acid-water streams and peat swamps. This comprises of five species: Systomus pentazona (Boulenger, 1894) from Borneo (North Sarawak, Brunei Darussalam, East Kalimantan); S. hexazona (Weber & de Beaufort, 1912) from Malay Peninsula, Sumatra and Borneo; S. rhomboocellatus (Koumans, 1940) from Borneo (West and Central Kalimantan); S. foerschi (Kottelat, 1982) from Borneo (Central Kalimantan); and S. endecanalis (Roberts, 1989) from Borneo (West Kalimantan).

Systomus navjotsodhii belongs to Group 1.