Lost shark

The lost shark (Carcharhinus obsolerus), previously known as the false smalltail shark, is a possibly extinct species of requiem shark (family Carcharhinidae). It is known only from the Western Central Pacific Ocean, in the southern South China Sea.

Lost shark

Critically endangered, possibly extinct  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Carcharhiniformes
Family: Carcharhinidae
Genus: Carcharhinus
Species:
C. obsolerus
Binomial name
Carcharhinus obsolerus
White, Kyne, & Harris, 2019

History

Only three specimens of this species are known, found in Borneo, Vietnam, and Thailand, all of which are over 80 years old. The specimens were originally tentatively assigned as belonging to the smalltail shark (C. porosus), but a number of subtle morphometric differences revealed that they belonged to a new Carcharinus species, referred to as Carcharinus sp. A. It differs from other Carcharinus species by the relative position of the second dorsal and anal fins, as well as its low vertebral count.[2][3]

Conservation status

As no individuals have been identified for over 80 years, C. obsolerus may be extinct. Like other members of the C. porosus subgroup, C. obsolerus likely had limited fecundity and lived in shallow waters that are easily accessed by fishermen, both of which put it at heavy risk of extinction from overfishing. However, the rediscovery of the Borneo shark (C. borneensis) in 2004 after a long period of no sightings has kept hopes for its possible survival.[2] But in 2020, the IUCN Red List declared the lost shark to be Critically Endangered or Possibly Extinct.[4]

References
  1. Dulvy, N.K., Kyne, P.M., Finucci, B. & White, W.T. 2020. Carcharhinus obsoletus. The IUCN Red List of Threatened Species 2020: e.T115696622A115696628. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T115696622A115696628.en. Downloaded on 20 June 2021.
  2. Harris, Mark; Kyne, Peter M.; White, William T. (2019-01-02). "Lost before found: A new species of whaler shark Carcharhinus obsolerus from the Western Central Pacific known only from historic records". PLOS ONE. 14 (1): e0209387. Bibcode:2019PLoSO..1409387W. doi:10.1371/journal.pone.0209387. ISSN 1932-6203. PMC 6314596. PMID 30601867.
  3. Gabbatiss, Josh (4 January 2019). "New 'lost' shark species may already be extinct due to overfishing". The Independent. Retrieved 7 January 2019.
  4. "European bison recovering, 31 species declared Extinct – IUCN Red List". IUCN. 2020-12-10. Retrieved 2020-12-10.

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