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Science 4 April 1986:
Vol. 232. no. 4746, pp. 73 - 76
DOI: 10.1126/science.232.4746.73
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Articles

Living Nautilus Embryos: Preliminary Observations

JOHN M. ARNOLD 1 and BRUCE A. CARLSON 2

1 Pacific Biomedical Research Center, University of Hawaii, Honolulu, HI 96822.
2 Waikiki Aquarium, Honolulu, HI 96815.

Nautilus, long recognized as the most primitive living cephalopod, provides insight into molluscan evolution. Despite many attempts, embryos have not been observed until now. This report details the surface morphology and extraembryonic circulatory pattern. It was found that development, as in other extant cephalopods, is direct, without larval stages. There appears to be no embryonic protoconch associated with shell ontogeny.

Submitted on September 17, 1985
Accepted on January 22, 1986


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Anomalies of embryonic shell growth in post-Triassic Nautilida.
(2001)
Paleobiology 27, 485-499


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