|Scientific Name:||Apristurus macrostomus Chu, Meng & Li, 1985|
|Taxonomic Notes:||The genus Apristurus contains at least 32 described species and a relatively large number of potentially undescribed ones. Morphological conservatism and, until recently, a lack of objectively defined characters makes this one of the most taxonomically confused shark genera (Compagno 1984, Nakaya and Sato 1999).
Nakaya and Sato (1999) defined three species groups within Apristurus: the longicephalus-group (two species), brunneus-group (20 species) and spongiceps-group (10 species). A. macrostomus belongs to the brunneus-group, characterized by: a short, wide snout (prenarial length < 6% TL); 13 to 22 valves in the spiral intestine; upper labial furrows obviously longer than the lower furrows; a discontinuous supraorbital sensory canal.
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor(s):||Huveneers, C. & Duffy, C.|
|Reviewer(s):||Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)|
A deepwater catshark known only from one 38 cm total length (TL) male (previously incorrectly cited as a female) caught in the South China Sea at a depth of 913 m. Possibly taken in deepwater trawl fisheries. Insufficient information is available to assess this species beyond Data Deficient.
|Range Description:||Apristurus macrostomus is known only from the holotype, caught in the South China Sea.|
|FAO Marine Fishing Areas:|
Pacific – northwest
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Only known from the holotype.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Known only from the holotype, a 38 cm totale length (TL) mature male, caught at 913 m depth. The English translation of the original description by Meng, Chu and Li (1985) incorrectly listed the holotype as a female. However, the illustration, figure caption and the Chinese text of the original description shows it to be a mature male (L.J.V. Compagno, pers. comm., 2003).
Apristurus species are relatively small, sluggish sharks that live on or near the bottom over upper to mid continental and insular slopes. Diet includes crustaceans (penaeid shrimps, euphausids), squids and small fishes. Where known reproduction is oviparous with one egg per oviduct. Egg cases are usually thick-walled and about 5 to 6.8 cm long and 2.5 to 2.9 cm wide. The anterior end of the case has a long weak fibrous thread on each corner. The posterior end usually has two small processes, each with a long coiled tendril. As in shallow water scyliorhinids the coiled tendrils are probably used to attach the egg cases to hard substrates and/or biogenic structures as they are laid.
|Major Threat(s):||Unknown. Possibly taken in deepwater trawl fisheries. Other species of deepwater Chondrichthyans are known to be captured as bycatch in deepwater fisheries. As these fisheries expand globally, consideration needs to be given to the fact that this species too may be captured incidentally in deepwater fisheries.|
|Conservation Actions:||No conservation measures are currently in place for this species.|
Compagno, L.J.V. In prep. b. Sharks of the World. An annotated and illustrated catalogue of the shark species known to date. Volume 3. (Carcharhiniformes). FAO Species Catalogue for Fisheries Purposes No. 1, Vol.3. FAO, Rome.
IUCN. 2004. 2004 IUCN Red List of Threatened Species. Available at: www.iucnredlist.org. (Accessed: 23 November 2004).
IUCN SSC Shark Specialist Group. Specialist Group website. Available at: http://www.iucnssg.org/.
Nakaya, K. and Sato, K. 1999. Species grouping within the genus Apristurus (Elasmobranchii: Scyliorhinidae). In: B. Séret and J.-Y. Sire (eds). Proceedings of the 5th Indo-Pacific Fish Conference (Nouméa, 3-8 November 1997). Paris, Society Francaise d’Ichthyologie et Instutue de Recherches pour le Development: 307–320.
|Citation:||Huveneers, C. & Duffy, C. 2004. Apristurus macrostomus. The IUCN Red List of Threatened Species 2004: e.T44219A10873757.Downloaded on 18 January 2018.|
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