|Scientific Name:||Apristurus platyrhynchus|
|Species Authority:||(Tanaka, 1909)|
Apristurus acanutus Chu, Meng, & Li in Meng, Chu & Li, 1985
Apristurus sp. nov. B
Apristurus verweyi (Fowler, 1934)
Scyliorhinus platyrhynchus Tanaka, 1909
|Taxonomic Notes:||Synonyms = Scyliorhinus platyrhynchus Tanaka, 1909; Pentanchus platyrhynchus Fowler, 1941; Apristurus acanutus Chu, Meng & Li, 1985; Apristurus verweyi (Fowler, 1934); Pentanchus verweyi Fowler, 1934.
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. platyrhynchus 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.
Nakaya and Sato (2000) reviewed the taxonomy of A. platyrhynchus and related species, listing A. acanutus Chu, Meng & Li, 1985 and A. verweyi (Fowler, 1934) as junior synonyms.
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor(s):||Duffy, C. & Huveneers, C.|
|Reviewer(s):||Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)|
Apristurus platyrhynchus is a poorly known, Indo-West Pacific continental slope deepwater catshark. Maximum size is estimated to be about 85 cm total length (TL). Probably taken as bycatch in deepwater trawl, set net and line fisheries throughout its range. However, at present there is insufficient information available to assess the species beyond Data Deficient.
|Range Description:||The species occurs in the Indo-West Pacific from Malaysia and Borneo north to Suruga Bay, Japan.|
Native:Brunei Darussalam; China; Indonesia (Kalimantan); Japan; Malaysia (Sabah, Sarawak); Philippines
|FAO Marine Fishing Areas:||
Pacific – northwest; Pacific – western central
|Range Map:||Click here to open the map viewer and explore range.|
|Habitat and Ecology:||
A. platyrhynchus is a poorly known, continental slope species. Maximum size was estimated by Nakaya and Sato (2000) to be about 85 cm TL. Both sexes mature around 60 cm TL. Reproduction is oviparous with one egg per oviduct laid at a time. Egg cases are long, slender and cylindrical (9.4 cm long x 2.2 cm wide). The surface of the egg case is smooth, the anterior end lacks processes and is composed of weak fibrous tissue. The posterior end comes to a single point and lacks tendrils (Nakaya and Sato 2000). The construction of the egg cases and absence of tendrils suggests the eggs may be retained in the female and develop in-utero. This appears to be unique among the Apristurus species, however, the egg cases and development of many have yet to be described.
Apristurus species are relatively small, sluggish sharks that live on or near the bottom. Diet includes crustaceans (penaeid shrimps, euphausiids), squids and small fishes.
|Major Threat(s):||Probably taken as bycatch in deepwater trawl, set net and line fisheries throughout its range. 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 actions are currently in place for this species.|
|Citation:||Duffy, C. & Huveneers, C. 2004. Apristurus platyrhynchus. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 04 July 2015.|