Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The life cycle of the nite Gammaridacaurs brevisternalis (Acari: Laelaptidae); A parasite on the sandy beach hoppers of the genus Orchestoidea
Student Author(s): Ellis, William John
Faculty Advisor(s): Burnett, Robin
Pages: 13
Location: Final Papers Biology 175H
Date: June 1980
Keywords: symbiosis at the seashore
Abstract: The life cycle of Gammaridacarus brevisternalis is documented for the first time. The life cycle appears to follow that of a typical Gamasida mite with two exceptions: it skips the prelarva stage and appears to undergo an adult molt. The life cycle is divided between beach wrack and beach amphopods of the genus Orchestoidea. Only the deutonymphs and adults are found on Orchestoidea. Gravid femalis are found almost exclusively on beach wrack. It appears that the wrack somehow induces fertility in the mites.