Author： BARÓN P.J.
Publisher： Oxford University Press
ISSN： 1464-3766
Source： Journal of Molluscan Studies, Vol.69, Iss.3, 2003-08, pp. : 221-227
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Abstract
The embryology of Loligo sanpaulensis, a south-western Atlantic squid, was studied for the first time. Egg masses were obtained by SCUBA divers in Nuevo Gulf, Argentina, and embryos were incubated in aquaria at five temperatures from 12° to 23°C. A scale of embryonic development was created for the species and the chronology of organ formation was compared with that of other loliginids. Embryogenesis was completed in incubations at 16.2° and 19°C. At 23°, 12.5° and 12°C, all embryos died after hatching. At 19°C, development from blastulation to hatching lasted 14 days (276° d daily accumulated temperature, DAT). A total of 310° d DAT was estimated for complete embryonic development of the species. Stages of blastulation and organogenesis showed few differences relative to those described for Loligo pealei (in Arnold, 1965). In the study area, near the southern limit of the distribution of the species, seawater temperatures under 13°C are expected to restrict the embryonic development to the warmest months of the year (November–May).
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