Elasmobranchii (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Carcharhinidae (Requiem sharks)
Etymology: Carcharhinus: karcharos (Gr.), sharp or jagged; rhinus, an ancient name for sharks, from rhine (Gr.), rasp, both words alluding to a shark's jagged, rasp-like skin. (See ETYFish); coatesi: In honor of angler, artist and illustrator George Coates (d. 1980), who captured many elasmobranchs in North Queensland, Australia, including holotype of this one. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; depth range 0 - 123 m (Ref. 106604). Tropical
East Indian to Western Pacific: Australia and possibly off New Guinea.
Size / Weight / Age
Maturity: Lm ? range ? - 70 cm
Max length : 87.0 cm TL male/unsexed; (Ref. 89954); 88.0 cm TL (female)
Short description
Identification keys | Morphology | Morphometrics
This species is distinguished by the following characters: moderately long and narrowly rounded snout; oblique and blade-like upper anterior teeth are coarsely serrated, lateral margin deeply notched, with several large and smooth basal cusplets; lower anterior teeth are narrower, slightly oblique, with lateral margins notched and usually several smooth basal cusplets; total tooth row counts 24-26/23-25, or 47-51; interdorsal space with ridge on midline, 18.0-23.1% TL; moderately tall and slightly falcate first dorsal fin, its origin just anterior to pectoral-fin free rear tip, length 14.8-17.3% TL, 1.5-1.9 times height, inner margin 2.0-2.8 in base; a much smaller second dorsal fin, broadly triangular, height 28-37% of first dorsal-fin height, origin about opposite to anal-fin origin; falcate anal fin, its height 0.9-1.4 times second dorsal height, base 0.9-1.2 times second dorsal-fin base; body colour pale brownish to grey dorsally, whitish ventrally; second dorsal fin with a black blotch on upper one to two thirds of fin, not extending onto upper surface of body and well defined from ground colour; other fins are plain or with pale outer margins; total vertebral counts 134-147; monospondylous precaudal counts 42-50; diplospondylous precaudal counts 22-33; diplospondylous caudal counts 64-73; precaudal counts 67-76 (Ref. 89954).
Reproduction of this species apparently not seasonal, with litter size of 1-3 (mean 2) and size at birth of 38.0-40.0 cm TL (Ref. 89954).
Life cycle and mating behavior
Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae
White, W.T., 2012. A redescription of Carcharhinus dussumieri and C. sealei, with resurrection of C. coatesi and C. tjutjot as valid species (Chondrichthyes: Carcharhinidae). Zootaxa 3241:1-34. (Ref. 89954)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00221 - 0.01036), b=3.09 (2.92 - 3.26), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trophic level (Ref.
69278): 4.0 ±0.6 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): High vulnerability (55 of 100).
