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Mesozoa of the Sepiolid, Rossia pacifica (Berry)

1965; American Society of Parasitologists; Volume: 51; Issue: 3 Linguagem: Inglês

10.2307/3275943

1937-2345

Ethelwyn G. Hoffman,

Isotope Analysis in Ecology

Two species of dicyemid mesozoa new to the Pacific Northwest are described from specimens of Rossia pacifica taken from the coastal waters of Washington and Oregon. Dicyemennea brevicephaloides Bogolepova-Dobrokhotova, 1962 and Dicyemennea parva sp. n. were found to be cohabitants of the aforementioned sepiolid. D. brevicephaloides was found principally in the branchial heart coela of its host while D. parva occurred in the renal coelom. Two species of dicyemid mesozoa were found to parasitize specimens of the sepiolid cephalopod Rossia pacifica. The material for this study was taken from the coastal waters of Washington and Oregon. A single individual of R. pacifica from the waters of southeastern Alaska has been examined. This specimen, which was taken from Auke Bay (58021' N lat, 134041' W long), was not parasitized by any species of dicyemid. Bogolepova-Dobrokhotova (1960, 1962) has described a number of species of dicyemids from the Bering Sea, the Sea of Okhotsk, and the Sea of Japan. Since her work is published in Russian, a fairly full description of one species we have in common is included. Additional observations on the biology of this mesozoan are discussed, and a description of the infusorigen, previously not published, is given. Dicyemennea brevicephaloides BogolepovaDobrokhotova, 1962 (Figs. 1 and 2) Diagnosis Dicyemennea: Somatic cells usually 23; calotte flattened; in adult nematogens calotte broader than trunk; propolar cells much smaller than the large metapolar cells which constitute the major part of the calotte; calotte and parapolar cells sharply set off from trunk; infusorigens large, spherical; infusoriform lacking refringent bodies, with only one free nucleus and one germ cell in each of the four urn cells. Hosts: Rossia pacifica (Berry) and Octopus sp. Specimens deposited: Slides are on file with the USNM No. 23714 (2 slides). These are from the R-4 and R-5 series of the author. Localities: NE Sea of Okhotsk (in both hosts); Sea of Japan (Rossia); Puget Sound, Washington (Rossia) (47?38' N lat, 122?50' W long); and Received for publication 26 September 1963. * Research supported in part by National Science Foundation Graduate Fellowship. Present address of author: Auke Bay Biological Laboratory, P. 0. Box 155, Auke Bay, Alaska 99821. coast of Oregon, off Coos Bay (Rossia) (43?12' N lat, 124?12' W long).