Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The dynamics of the escape response of the gastropod Calliostoma canaliculatum to the sea star Pycnopodia helianthoides
Student Author(s): McDevitt, Christine A.
Faculty Advisor(s): Baxter, Chuck
Pages: 25
Location: Final Papers Biology 175H
Date: June 1988
Keywords: biological studies on gastropods
Abstract: The gastropod Calliostoma canaliculatum demonstrates a violent escape respnse to the seastar Pycnopodia hellianthoides. The entire escape mechanism is a high complex series of reactions the culmenates in the secretion of a noxious yellow substance from the animal's hypobranchial gland. The extent to which C. canaliculatum will go to escape from Pyncopodia without using the secretion demonstrates a general reluctance to use the method if it can be avoided. The source of this excretion appears to be endogenous to C. canaliculatuam and does not come from its diet. Once secreted, the snail needs between 4-7 days to regenerate the substance to its full capacity, but four days appears to be sufficient for the effectiveness of the substance to reach its full strength.