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); zygaena: zygaina, ancient Greek name for hammerhead sharks, derived from zygon, yoke, alluding to yoke-like shape of cephalofoil. (See ETYFish).
More on author: Linnaeus.
Preferred temperature (Ref. 115969
): 11.8 - 28.9, mean 26.5 (based on 3124 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5029 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00417 (0.00256 - 0.00679), b=3.03 (2.89 - 3.17), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 4.9 ±0.5 se; based on diet studies.
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (tmax=21; tm=8.8; Fec=20-40).
Prior r = 0.28, 95% CL = 0.16 - 0.49, Based on 1 stock assessment.
Fishing Vulnerability (Ref. 59153
): High to very high vulnerability (68 of 100).
Climate Vulnerability (Ref. 125649
): Moderate vulnerability (38 of 100).