Lichtenfels & Klei 1988. Cylicostephanus torbertae sp. n. (Nematoda: Strongyloidea) from Equus caballus with a discussion of the genera Cylicostephanus, Petrovinema, and Skrjabinodentus. Proceedings of the Helminthological Society of Washington, 55(2) 1988: 165-170