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Observations on the Embryos of the Longfin Mako, Isurus paucus, and the Bigeye Thresher, Alopias superciliosus

R. Grant Gilmore
Copeia
Vol. 1983, No. 2 (May 6, 1983), pp. 375-382
DOI: 10.2307/1444380
Stable URL: http://www.jstor.org/stable/1444380
Page Count: 8
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Observations on the Embryos of the Longfin Mako, Isurus paucus, and the Bigeye Thresher, Alopias superciliosus
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Abstract

Four embryos of Alopias superciliosus and one of Isurus paucus were dissected and examined along with the reproductive organs of adults captured in the Florida Current off the east-central coast of Florida between latitude 26°30′N and 28°30′N. The embryos were found to contain yolk, demonstrating prenatal nutrition through intrauterine oophagy. Various proportions of embryo anatomy considered diagnostic for these species resemble those of adults. The general gonad morphology and presence of egg capsules containing multiple ova resemble the described development stages of other lamnids, alopiids and Odontaspis taurus (Odontaspidae). This is the first documented observation of oophagy in these species.

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