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1 October 2009 A New Opecoelid Species (Trematoda: Opecoelidae) from the Threespine Stickleback Gasterosteus aculeatus L. in California
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Abstract

Plagioporus kolipinskii n. sp. (Trematoda: Opecoelidae) is described from the intestine of the threespine stickleback, Gasterosteus aculeatus L., from Lobos Creek, a freshwater stream in Presidio, San Francisco County, California. Plagioporus kolipinskii is morphologically somewhat similar to 4 (P. serotinus Stafford, 1904, P. angusticollis Hausmann, 1896, P. macrouterinus Haderlie, 1953, and P. shawi [McIntosh, 1939]) of the 12 currently recognized North American species of the genus, but can be readily distinguished from all 4 in possessing a much larger acetabulum and a larger ovary relative to the testes. In addition, the new species can be distinguished from P. angusticollis by a smaller cirrus sac; from P. macrouterinus by the elongated shape of its body and reduced extent of its uterus (the uterus of P. macrouterinus extends posteriorly to the intersection of the testes); from P. shawi by a much-shorter cirrus sac (which reaches the ovary in P. shawi), an unlobed ovary (as opposed to a quadrilobed ovary in P. shawi), and fewer eggs that are also larger relative to body size.

John K. Tracey, Anindo Choudhury, Jan Marie Cheng, and Sibdas Ghosh "A New Opecoelid Species (Trematoda: Opecoelidae) from the Threespine Stickleback Gasterosteus aculeatus L. in California," Journal of Parasitology 95(5), 1177-1182, (1 October 2009). https://doi.org/10.1645/GE-1999.1
Received: 26 December 2008; Accepted: 1 May 2009; Published: 1 October 2009
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