Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Scyliorhinidae
Etymology: Cephaloscyllium: Greek, kephale = head + skylion = dogfish (Ref. 80388); cooki: Named for Sid Cook. More on authors: Last, Séret & White.
Environment: milieu / climate zone / depth range / distribution range
Marine; benthopelagic; depth range 223 - 300 m (Ref. 76946). Tropical
Western Pacific: Australia and Indonesia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 29.5 cm TL male/unsexed; (Ref. 76946)
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. 123251)
CITES (Ref. 123416)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 8.4 - 13.9, mean 13 °C (based on 28 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00170 - 0.00646), b=3.15 (2.97 - 3.33), 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
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (30 of 100) .