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Biol Bull 127: 294-303. (October 1964)
© 1964 Marine Biological Laboratory
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REPRODUCTION AND LARVAL DEVELOPMENT OF ACMAEA TESTUDINALIS (MÜLLER)

MARGARET M. KESSEL 1

1 Department of Zoology and Entomology, Univeristy of Connecticut, Storrs, Connecticut

1. At Noank, Connecticut, Acmaca testudinalis spawns from May to July.

2. Males tend to release gametes before females in June and early July, and thus in nature probably act as a stimulus to the females. However, in mid-July, males arid females spawned at about the same time and temperature in the laboratory.

3. When laid, eggs of A. testudinalis appear to be in a thin mucous sheet formed by agglutination of the gelatinous sheath about each egg. This sheath swells on contact with water and soon disappears, leaving the egg free and ready for fertilization.

4. The photopositive trochophore larvae form 10 to 13 hours after fertilization and remain in this stage for about 19 hours.

5. Veligers develop 31 to 36 hours after fertilization and remain in that stage for about 56 hours. They become increasingly photonegative.

6. Complete development from egg to newly formed adult takes about six weeks.






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Copyright © 1964 by the Marine Biological Laboratory.