Bull. So. Calif. Acad. Sci. 69(3-4): 179-181, 1970 RESEARCH NOTES NOTES ON THE ASSOCIATION BETWEEN HYPEROCHE MEDUSARUM A. AGASSIZ (AMPHIPODA, HYPERIIDEA) AND THE CTENOPHORE, PLEUROBRACHIA B AC H EI {MVLLER) Introduction Biologists have long recognized the association between certain hyperiid amphipods and various other pelagic animals. Hyperoche medusarum has been collected living with Aurelia aurita as reported by Stephensen (1923) and Schellenberg (1942). It has also been noted to be associated with Cyanea capillata and Timaformosa (Bowman etal., 1963). Associ- ations between this amphipod and ctenophores have also been reported by two authors. Stephensen observed H. medusarum in Be roe, and Schellenberg examined an unspecified ctenophore housing the amphipod. During the spring of 1969 some of this author's students discovered specimens of the cydippid ctenophore, Pleurobrachia bachei, inhabited by H. medusarum. After being led to some cognate literature through personal correspondence with Dr. Thomas E. Bowman of the Smith- sonian Institution, and with the welcome help of Mr. Robert Cimberg of the University of Southern California, Department of Biology, it was determined that the relationship was undescribed. The purpose of this paper is to report the above mentioned association and present a few descriptive notes. Discussion Specimens of P. bachei, collected from the coastal waters off northern California and preserved in 10% formalin solution, were examined for the presence of H. medusarum. A total of 135 ctenophores has been examined to date, 20 of which housed amphipods. Four of those 20 animals were inhabited by two amphipods each making a total of 24 H. medusarum collected. Twenty- one of the amphipods were juveniles, ranging from 0.75 mm to 1 .5 mm in length. Three adults were examined, one male (2.5 mm), and two females (2.75 and 3.0 mm). The smaller of the two females was carrying ova in the brood pouch. 179



Notes on the association between Hyperoche medusarum A. Agassiz (Amphipoda, Hyperiidea) and the ctenophore, Pleurobrachia bachei (Müller)

Gary J Brusca
Bull. So. Calif. Acad. Sci. 69(3-4): 179-181 (1970)

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