(full paper is archived in the Miller Library)
Title: Host utilization during ontogeny by two pycnogonid species (Tanystylum duospinum and Lecythorhyncus hilgendorfi) parasitic on the hydroid Eucopella everta (Coelenterata: Campanularidae)
Student Author(s): Russel, David J.
Faculty Advisor(s): Baxter, Chuck
Location: Final Papers Biology 175H
Date: June 1980
Keywords: symbiosis at the seashore
Abstract: The hydroids Aglaophenia struthionides (Murray, 1860), Eucopella everta (Clark, 1896), and Abietinaria spp. in the low intertidal zone at Mussel Point, Pacific Grove, Monterey Bay, California, often bear the adult pycnogonids Tanystylum duospinum (Hilton, 1939) and Lecythorhyncus hilgendorfi (Bohm, 1879). Larval stages of these pycnogonids were found living and feeding on Eucopella everta. The larvae of Tanystylum duospinum are ectoparasitic. Those of Lecythorhyncus hildendorfi are endoparasitic in the gastrovasuclar cavities of hydranths. Larvae of both species feed on the gut contents of Eucopella everta, often on the same hydroid colony.