Abstract
Abstract Nubenocephalus secundus n. sp. (Apicomplexa: Eugregarinida) is described from adults of Argia sedula (Odonata: Zygoptera: Coenagrionidae) collected from Harmon Creek, Sam Houston State University Center for Biological Field Studies, Walker County, Texas, U.S.A. This is the second species described in the genus and confirms the generic hypothesis of Nubenocephalus. The generic diagnosis of Nubenocephalus is revised to reflect common characters of its constituent species and a previously described Asian gregarine, Nubenocephalus mutabilis n. comb. (=Ancyrophora mutabilis) is recognized as a member of the genus.
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