Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Sphyrnidae
(Hammerhead, bonnethead, or scoophead sharks)
Etymology: Sphyrna: Probable misspelling of sphyra (Gr.), hammer, referring to their hammer-shaped heads. (See ETYFish); lewini: Patronym not identified, perhaps in honor of John Lewin (1770-1819), who illustrated early volumes of Australian natural history (this shark was described from Australia) and may be the “Mr. Lewin” who illustrated the plates in Griffith and Smith’s book. (See ETYFish).
Preferred temperature (Ref. 115969
): 18.7 - 29, mean 27.2 (based on 2890 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5029 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00355 (0.00281 - 0.00449), b=3.10 (3.03 - 3.17), in cm Total Length, based on LWR estimates for this species (Ref. 93245
Trophic level (Ref. 69278
): 4.1 ±0.5 se; based on diet studies.
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (rm=0.028; K=0.05-0.24; tm=3-15; tmax=41.6; Fec=13-23).
Prior r = 0.06, 95% CL = 0.04 - 0.10, Based on 2 stock assessments.
Fishing Vulnerability (Ref. 59153
): Very high vulnerability (78 of 100).
Climate Vulnerability (Ref. 125649
): High vulnerability (62 of 100).