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Embryonic Velar Structure and Function of Two Sibling Species of Crepidula With Different Modes of Development

O. R. Chaparro^1,*, J. L. Charpentier¹ and R. Collin^2,

¹ Instituto de Biología Marina Dr. J. Winter, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
² Committee on Evolutionary Biology, University of Chicago, 1025 E. 57th St., Chicago, Illinois 60637, and the Field Museum, 1400 S. Lake Shore Dr., Chicago, Illinois 60605

* To whom correspondence should be addressed. E-mail: ochaparr{at}uach.cl

Current address: Smithsonian Tropical Research Institute, P.O. Box 2072, Balboa, Ancon, Republic of Panama. E-mail: collinr{at}naos.si.edu

The structure and function of the embryonic velum of two closely related species of Crepidula with different modes of development are examined. The velum of C. dilatata, a direct developer whose embryos feed on nurse eggs, does not differ substantially from the velum of C. fecunda, a species with planktotrophic larvae. Although velar ciliation develops earlier in embryos of C. dilatata, embryos of both species were able to feed on small particles, using the opposed-band ciliary mechanism. However, the embryos of C. dilatata lose this ability as they grow. The embryos of C. dilatata were not able to swim, whereas those of C. fecunda swam consistently in vials of seawater. This difference in swimming ability is probably due to differences in velum-body size allometry between the two species.

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