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Cephaloscyllium cooki, Cook’s swellshark
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Cook’s swellshark
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drawing shows typical species in Scyliorhinidae.
Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Scyliorhinidae
(Cat sharks) > Scyliorhininae
Etymology:
Cephaloscyllium:
cephalus
, from
kephale
(Gr.), head, referring to its very broad and depressed head;
skylion
, Greek for dogfish or small shark. (
See ETYFish
)
;
cooki:
In honor of the late Sidney F. Cook (1953-1997), shark fisheries biologist, “whose energy, dedication and contribution to shark conservation is sadly missed”. (
See ETYFish
)
.
More on authors:
Last
,
Séret
&
White
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; benthopelagic; depth range 223 - 300 m (Ref.
76946
). Tropical
Western Pacific: Australia and Indonesia.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 29.5 cm TL male/unsexed; (Ref.
76946
)
Short description
Morphology
|
Morphometrics
This small species has the following set of characters: relatively robust body, head height 10.5-14.2% TL, trunk width 17.1-21.7% TL; origin of first dorsal-fin over the centre or posterior half of pelvic-fin base; prenarial 4.9-5.5% TL in length; preorbital snout length 1.3-1.6 times the prenarial length, 2.5-3.1 in prepectoral length, 5.5-6.6 in prepelvic length; snout-vent length is short, 45.4-49.3% TL; wide nostrils, the width 3.0-3.4% TL; eye-spiracle space wide, 1.0-1.2% TL; small pectoral fin, height 9.4-10.2% TL, posterior margin 8.9-9.8% TL; anal fin low 2.8-3.4% TL; caudal peduncle long, anal-caudal space 6.3-6.9% TL; teeth mainly with 3 cusps near symphysis of upper jaw; mainly weakly tricuspidate are the flank denticles; back without greatly enlarged denticles; very long adult clasper, its outer length to at least 10% TL, almost reaching anal fin, interspace 0.9-1.0% TL; vertebral centra 101-106; tooth count low, 48-62 teeth in each jaw; 8 dark, white-edged saddles on the upper half of body, tail and caudal fin; under-surface mainly uniform greyish, with the snout darkest (Ref.
76946
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Last, P.R., B. Séret and W.T. White
, 2008. New swellsharks (
Cephaloscyllium
: Scyliorhinidae) from the Indo-Australian region. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper no. 22. (Ref.
76946
)
IUCN Red List Status (Ref.
130435
)
Data deficient (DD)
; Date assessed:
23 April 2015
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 8.4 - 13.9, mean 13 °C (based on 28 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00263 (0.00139 - 0.00497), b=3.21 (3.04 - 3.38), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.8 ±0.5 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Preliminary low fecundity).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (20 of 100).
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- 20 July 2016
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