velum

The pedal glands become visible, and the velum gradually shrinks.

fecunda, the velum grows throughout intracapsular development.

fecunda continue growing until hatching, as does the velum.

fecunda, and the relative size of the velum is smaller; however, the operculum is not lost, and there is no elaboration of the embryonic kidneys or massive enlargement of the head vesicle as has been reported for embryos of another direct-developing Crepidula species (Moritz, 1939; Collin, 2000).

velum, nucleic acids extracted from reproductive tissues of adult clams were screened for the presence of symbiont genes.

velum and one male from each sampling month except September and December 1992, when no adult males were processed.

velum and to document the development of the symbiosis in a new generation of hosts, juveniles collected from laboratory-spawned cultures 11 and 64 days after fertilization (Gustafson and Lutz, 1992) were examined.