Calero-Bernal, RafaelVerma, Shiv KumarCerqueira-Cezar, Camila K.Schafer, Laurence M.Van Wilpe, ErnaDubey, Jitender P.2015-09-082015-09-082015-12Calero-Bernal, R, Verma, S, Cerqueira-Cézar, CK, Schafer, L, Van Wilpe, E & Dubey, JP 2015, ' Sarcocystis mehlhorni n. sp. (Apicomplexa : Sarcocystidae) from the black-tailed deer (Odocoileus hemionus columbianus)', Parasitology Research, vol. 114, no. 12, pp. 4397-4403.0932-0113 (print)1432-1955 (online)http://hdl.handle.net/2263/49747Infection with Sarcocystis is common in many species of wild cervids but none is reported from the black-tailed deer (Odocoileus hemionus columbianus). Here, we report Sarcocystis infection in two black-tailed deer from northwest USA for the first time. Sarcocysts were microscopic, up to 556 μm long and mature. The sarcocyst wall was up to 1.39 μm thick, and had rectangular 1.17 μm long villar protrusions, type 17, with thin (230 nm) electron dense ground substance layer. Molecular characterization and phylogenetic analysis indicated that Sarcocystis in the black-tailed deer is related to structurally distinct Sarcocystis species in cervids. A new name, Sarcocystis mehlhorni, is proposed for the Sarcocystis species in black-tailed deer.en© Springer-Verlag 2015. The original publication is available at : http://link.springer.comjournal/436.Black-tailed deerOdocoileus hemionus columbianusSarcocystisUltrastructurePhylogenyPostprint Article