Collocheres (Copepoda: Siphonostomatoida) Associated with the Crinoid Capillaster multiradiatus in the Indo-Pacific

Abstract

Two siphonostomatoid copepods are associated with the crinoid Capillaster multiradiatus in Madagascar and in the Moluccas. Collocheres prionotus n. sp. may be differentiated from its congeners by the three pairs of small spines on the lateral margins of the female genital segment and by the absence of a palp on the mandible. Collocheres uncinatus is reported for the first time from this crinoid. Eleven members of the genus Collocheres Canu, 1983 are currently known to be associated with crinoids or ophiuroids. In the Indo-Pacific, copepods belonging to this genus are abundant on at least 10 species of shallow-water crinoids in the Gulf of Aqaba, Madagascar, northern Australia and the Great Barrier Reef, Philippines, Japan, Moluccas, and New Caledonia (Ho, 1982; Humes, 1987; Stock 1966). The purpose of this paper is to describe a new species of Collocheres and to record a new host for Collocheres uncinatus Stock, 1966, both found on Capillaster multiradiatus (Linnaeus) in Madagascar and the Moluccas. MATERIALS AND METHODS The crinoids were isolated immediately after collection in sea water in plastic bags. Later, they were washed in the same sea water to which a small amount of 95% ethanol had been added to make approximately a 5% solution. After passing the water through a fine net (120 holes per 2.5 cm), the copepods were picked from the sediment retained. The copepods were studied using the wooden slide/lactic acid technique described by Humes & Gooding (1964). All figures were drawn with the aid of a camera lucida. The letter after the explanation of each figure refers to the scale at which it was drawn. The abbreviations used are: A1, first antenna; A2, second antenna; and OC, oral cone. The collection of specimens in Madagascar was made possible by the United States Program in Biology of the International Indian Ocean Expedition. Copepods in the Moluccas were collected by the author during the Alpha Helix East Asian Bioluminescence Expedition, which was supported by the National Science Foundation of the United States under grants OFS 74 01830 and OFS 74 02888 to the Scripps Institution of Oceanography and grant BMS 74 23242 to the University of California, Santa Barbara. The study of the material was supported by a National Science Foundation grant, BSR 8514561. I thank Miss Ailsa M. Clark, British Museum (Natural History), for the identifications of the crinoids from Madagascar and Dr. Donald McCurda, Jr., University of Michigan, for identifying the crinoids from the Moluccas. TRANS. AM. MICROSC. SOC., 109(1): 61-68. 1990. ? Copyright, 1990, by the American Microscopical Society, Inc. This content downloaded from 207.46.13.123 on Tue, 28 Jun 2016 07:18:39 UTC All use subject to http://about.jstor.org/terms TRANS. AM. MICROSC. SOC.