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Acta Parasitologica, Vol.46, No. 4, 2001, 293-298
Moravec Frantisek (1), Borucinska Joanna D. (2), Frasca Salvatore Jr. (3) - Pancreatonema americanum sp. nov. (Nematoda, Rhabdochonidae) from the pancreatic duct of the dogfish shark, Squalus acanthias, from the coast of Massachusetts, USA.

(1) Institute of Parasitology, Academy of Sciences of the Czech Republic, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic; (2) Department of Biology, University of Hartford, 200 Bloomfield Avenue, Hartford, CT 06117-1599, USA; (3) Department of Pathobiology and Veterinary Science, University of Connecticut, U-89, 61 North Eagleville Road, Storrs, CT 06269-3089, USA

A new rhabdochonid nematode, Pancreatonema americanum sp. nov., is described from the pancreatic ducts of dogfish sharks, Squalus acanthias L., in the North Atlantic Ocean off the coast of Massachusetts, USA. Pancreatonema americanum sp. nov. differs significantly from the only other congeneric species, P. torriense McVicar et Gibson, 1975, on the basis of the following: absence of an unpaired median papilla and a pair of postanal papillae on the vesicular formation surrounding the cloacal aperture, absence of a rim surrounding the mouth and small single lateral cephalic papillae of the inner circle, considerably larger body and organ measurements, and host types (sharks vs. rays). The presence of a remarkable vesicular formation surrounding the cloacal aperture is the principle feature distinguishing Pancreatonema McVicar et Gibson, 1975 from Johnstonmawsonia Campana-Rouget, 1955.

KEY WORDS: Pancreatonema, Rhabdochonidae, Nematoda, shark, Squalus acanthias, Massachusetts, Atlantic Ocean
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