Present (dark blue) and possible historical (light blue) range of the Borneo shark[2][3]
Synonyms
Carcharias borneensis Bleeker, 1858
The Borneo shark (Carcharhinus borneensis) is a species of requiem shark, and part of the family Carcharhinidae. Extremely rare, it is known only from inshore waters around Mukah in northwestern Borneo, though it may once have been more widely distributed. A small, gray shark reaching 65 cm (26 in) in length, this species is the only member of its genus with a row of enlarged pores above the corners of its mouth. It has a slender body with a long, pointed snout and a low second dorsal fin placed posterior to the anal fin origin.
Almost nothing is known about the natural history of the Borneo shark. It is viviparous like other requiem sharks; the females bear litters of six pups, which are provisioned through gestation by a placental connection. The International Union for Conservation of Nature last assessed this species as Critically Endangered. While an extant population has since been found, the Borneo shark continues to merit conservation concern given its highly limited range within heavily fished waters.
^Dulvy, N.K.; Bin Ali, A.; Derrick, D.; Dharmadi; Fahmi (2021). "Carcharhinus borneensis". IUCN Red List of Threatened Species. 2021: e.T39367A124407121. doi:10.2305/IUCN.UK.2021-2.RLTS.T39367A124407121.en. Retrieved 24 May 2023.
^Cite error: The named reference iucn was invoked but never defined (see the help page).
^Cite error: The named reference white et al was invoked but never defined (see the help page).
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