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Down arrow Cat-eLog Data Sheet
Scientific Name Silurichthys exortivus  Ng & Kottelat, 2022
Common Name
Type Locality Belayan River system, Mahakam River drainage, REA Plantations, Long Buluh Damai Estate, Kalimantan Timur, Borneo, Indonesia, 0°14'29"N, 116°19'14"E.
Pronunciation Seel loo reek thees
Etymology From Silurus and the Greek ichthyos, meaning fish; in reference to the general resemblance to members of the genus Silurus. The species name comes from the Latin adjective exortivus, meaning “towards the sunrise”. This name is used in allusion to distribution of this species (eastern Borneo), which represents the easternmost limit of its distribution.
Down arrow Species Information
Identification Silurichthys exortivus can be distinguished from all congeners in having 4 (vs. 6–7) principal rays on the upper caudal-fin lobe, lacking (vs. having) a dorsal fin, and, except for S. sanguineus, in lacking (vs. having) pelvic fins. It further differs from S. ligneolus and S. sanguineus in having a caudal fin with distinct, asymmetrical lobes (vs. obliquely truncate and without distinct lobes), and in the number of anal-fin rays (54 vs. 44–45 in S. ligneolus and 60 in S. sanguineus). The following combination of characters additionally distinguishes it from congeners: body depth at anus 14.0% SL, caudal peduncle depth 5.1% SL, upper lobe of caudal fin 1.1 times longer than lower lobe, 1 raker on first gill arch, 48 vertebrae and brown mottled body.
Down arrow Habitat Information
Distribution Mahakam River drainage in eastern Borneo.
Pacific, Greater Sunda Island Rivers, Borneo Waters, East Borneo Waters, Mahakam (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
Down arrow Husbandry Information
Breeding Reports There is no breeding report.
Down arrow Further Information
Reference Zootaxa 5138 (no. 2), pp 186, Fig. 1.
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Last Update 2022 Sep 25 08:35 (species record created: 2022 May 16 17:03)