(full paper is archived in the Miller Library)
Title: Occurrence and behavior of Hyale grandicornis, a gammarid amphipod commensal in the genus Acmaea (Mollusca: Gastropoda: Prosobranchia)
Student Author(s): Johnson, Samuel E., II
Faculty Advisor(s): Abbott, Donald
Location: Final Papers Biology 175H
Date: June 1966
Abstract: Immature individuals of the amphipod Hyale grandicornis were found under the limpets Acmaea scabra, A. scutum, A. digitalis, A. limatula, and A. pelta on intertidal rocks 1-6 feet above mean lower low water along the California coast. H. grandicornis was not found in other situations in the adjacent habitat. During the day, the amphipods lie deep in the mantle groove or nuchal cavity; at night they move to the rim or upper surface of the shell and apparently feed on algae growing on the shell. The percentage of Acmaea hosting immature H. grandicornis increases with decreasing height in the intertidal region. Hyale exhibits no definite preference for a particular species of Acmaea.
Notes: Published 1968, Veliger 11(Suppl): 56-60