Clopton, R. E. (2004). Calyxocephalus karyopera g. nov., sp. nov. (Eugregarinorida: Actinocephalidae: Actinocephalinae) from the ebony jewelwing damselfly Calopteryx maculata (Zygoptera: Calopterygidae) in southeast Nebraska, U.S.A.: implications for mechanical prey–vector stabilization of exogenous gregarine development. Comparative Parasitology. 71(2): 141-153.
Calyxocephalus karyopera g. nov., sp. nov. (Eugregarinorida: Actinocephalidae: Actinocephalinae) from the ebony jewelwing damselfly Calopteryx maculata (Zygoptera: Calopterygidae) in southeast Nebraska, U.S.A.: implications for mechanical prey–vector stabilization of exogenous gregarine development