Elasmobranchii (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Pseudotriakidae (False catsharks)
Etymology: Planonasus: planus (L.), flat; nasus (L.), nose, referring to its soft, flat snout. (See ETYFish); parini: In honor of the late Nikolai Vasil’evich Parin (1932-2012), P. P. Shirov Institute of Oceanology, Russian Academy of Sciences, ichthyologist and chief scientist of the “memorable” cruise 17 of the research vessel Vityaz in 1988/89, during which holotype was collected. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathydemersal; depth range 1000 - 1120 m (Ref. 92921). Deep-water
Northwestern Indian Ocean: off the Socotra Islands, south of Yemen and east of the Horn of Africa.
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 53.4 cm TL (female); max. published weight: 560.00 g (Ref. 92921)
This small deep-water pseudotriakid species is distinguished by the following set of characters: soft body; bell-shaped head with a broadly parabolic snout; preorbital snout length 1.5-1.9 times the eye length; preoral length 0.7-0.8 times the mouth width, 1.4-1.5 times the prenarial snout length; eye length 1.9-2.3 times the nostril width; relatively broad head, width at middle gill slits 10-16% of TL; preorbital snout length 1.0-1.7 times the interorbital space (integumental) and 2.1-2.3 (skeletal), respectively; head length 2.0-2.5 times the mouth width, 9.8-10.9 times the nostril width, 2.8-3.3 times the length of preventral caudal-fin margin; length of pectoral-fin anterior margin 2.1-2.2 times the pectoral base length; length of first dorsal-fin inner margin 0.4-0.5 times the pectoral-fin base length; second dorsal-fin base length 13% of TL; color: plain dusky with fins and ventral snout somewhat darker, free rear tip of first dorsal fin marked white; each jaw with about 110-120 rows of very small tri- to multicuspidate teeth; monospondylous trunk vertebrae centra 50-52, diplospondylous precaudal centra 41, total centra about 115-140 (Ref. 92921).
Life cycle and mating behavior
Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae
Weigmann, S., M.F.W. Stehmann and R. Thiel, 2013. Planonasus parini n. g. and n. sp., a new genus and species of false cat sharks (Carchariniformes, Pseudotriakidae) from the deep northwestern Indian Ocean off Socotra Islands. Zootaxa 3609(2):163-181. (Ref. 92921)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
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Special reports
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Internet sources
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.0625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00170 (0.00068 - 0.00426), b=3.21 (2.99 - 3.43), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.9 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (41 of 100).
