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Plesiochorus  Looss, 1901 is a genus of Gorgoderidae infecting the urinary bladders of marine turtles globally. Currently, just two morphologically similar species are recognised,  Plesiochorus cymbiformis  (Rudolphi, 1819) Looss, 1901 and  Plesiochorus elongatus  Pigulevsky, 1953, which have been distinguished by molecular data and subtle morphological differences. Here we describe a new species,  Plesiochorus irwinorum  n. sp. , infecting hawksbill turtles ( Eretmochelys imbricata  (L.)), which is primarily distinguished from the other two species of  Plesiochorus  on the basis of ITS2,  cox 1 and 28S sequence data. Morphometric data for specimens examined during this study overlap between  P .  cymbiformis  and  P .  irwinorum  n. sp.  for every measured feature, rendering them functionally cryptic. However, principal components analysis clearly distinguishes the two species. Additionally, we report new specimens of  P .  cymbiformis , and provide new sequence data for specimens from Australian loggerhead ( Caretta caretta  (L.)) and hawksbill turtles. There is little understanding of the host-specificity or geographical distribution of the three species of  Plesiochorus , and it remains possible that some of the previously reported sequences have been attributed to the wrong species.

systematic parasitology

Plesiochorus irwinorum n. sp. (Trematoda: Gorgoderidae) from the urinary bladder of the hawksbill turtle, Eretmochelys imbricata (Testudines: Cheloniidae), off the east coast of Australia