Busycotypus canaliculatus (Linnaeus, 1758) Sinistral

Busycotypus canaliculatus (Linnaeus, 1758) Sinistral

Cape Cod, Massachusetts (about 137 mm.)

    Harry Lee dissected 850 embryonic shells out of a strand of B. canaliculatus egg capsules shortly after collecting it at Simpson's Creek, Jacksonville, Florida in May, 1979.  Three of 850 shells were sinistral.  Considering the extreme rarity of sinistral adult specimens (only two known to us), this finding suggests that sinistrality is associated with a selective disadvantage in this species.  In contrast, Magalh„es (1948, p. 396) teased 1848 specimens from a strand of Busycon carica capsules and found all to be dextral.  Clearly this type of study needs to be extended.

Magalh„es, H., 1948. An ecological study of snails of the genus Busycon at Beaufort, North Carolina.  Ecological Monographs 18(3): 379-409. July.