Description after Gilbert 1967 [#946]:
Teeth 13 to 15 - 0 - or 1 - 13 to 15/12 to 14 - 1 - 12 to 14; teeth weakly serrate in large individuals; first upper tooth nearly symmetrical and erect; subsequent upper teeth strongly oblique, their inner margins straight or evenly convex, their outer margins deeply incised and with the outermost teeth with very small, though well-developed cusps; lower teeth similar to upper, though smaller; first four teeth in lower jaw rather erect and with narrow cusps; one small symmetrical tooth at symphysis of lower jaw, none or one in upper jaw; one to two series of teeth functional along sides of upper jaw, and two to three series functional toward center; two to three series functional in lower jaw.
Figure 8. Sphyrna zygaena: b, upper and lower teeth, left side, about 1.7 X; c, second upper tooth; d, ninth upper tooth; e, third lower tooth; f, ninth lower tooth, (c-f, about 3.8 X.) (From Bigelow and Schroeder, 1948, p. 437.)
Material: sex?, 350 cm TL, Taiwan, collection: Jaws International, Gordon Hubbell, Florida
Images: © Ross Robertson, Smithsonian Tropical Research Institute, Panama, images shows the correct position of the teeth;
Material: sex?, ? TL,, collection: Natural History Museum of Los Angeles County, nr. 39605-1, Eastern Pacific, Mexico, Baja California, coll. by. W. Beadle