Cestodes of the Genus Hymenolepis Weinland, 1858 Sensu Stricto from Pocket Gophers Geomys and Thomomys spp. (Rodentia: Geomyidae) in Colorado and Oregon, with a Discriminant Analysis of Four Species of Hymenolepis

Authors

Scott Lyell Gardner, University of Nebraska - LincolnFollow
Gerald D. Schmidt, University of Northern ColoradoFollow

Date of this Version

11-1988

Comments

Published in Canadian Journal of Zoology Vol. 66 (1988): 896-903. Copyright 1988, NRC Research Press. Used by permission.

Abstract

Cestodes found to represent previously undescribed members of the genus Hymenolepis s. str. (Yamaguti, 1959) were recovered from pocket gophers, Geomys bursarius (Shaw), in northeastern Colorado. Hymenolepis weldensis n. sp. and Hymenolepis geomydis n. sp., not occurring together in any individual host, were found in 3 and 8%, respectively, of pocket gophers examined for helminths. The life cycle of H. weldensis was completed in the laboratory using beetles, Tenebrio molitor (L.), as intermediate hosts, and pocket gophers of three genera (Geomys, Thomomys, and Pappogeomys) as definitive hosts. Development of H. weldensis did not occur in laboratory rats, Rattus norvegicus (Berkenhout). Morphologic relationships four species of Hymenolepis (H. diminuta, H. tualatinensis, H. weldensis, and H. geomydis) were analyzed using multiple discriminant function analysis, which clearly allocated individual cestodes to the respective groups and discriminated species.

Des cestodes representant des especes encore inconnues d'Hymenolepis sensu stricto (Yamaguti, 1959) ont ete trouves chez des gaufres bruns, Geomys bursarius, dans le nord-est du Colorado. Hymenolepis weldensis n. sp. et Hymenolepis geomydis n. sp. quoique ne parasitant jamais ensemble le meme hote, ont ete retrouves chez 3 et 8% des gaufres examines. Le cycle complet d'H. weldensis a ete obtenu en laboratoire : le tenebrion Tenebrio molitor (L.) a servi d'hote intermediaire et des gaufres appartenant il trois genres (Geomys, Thomomys et Pappogeomys), d'hotes terminaux. Le developpement d'H. weldensis n'a pu etre rendu il terme chez des rats de laboratoire Rattus norvegicus (Berkenhout). Une analyse discriminante multiple a servi il etablir des relations morphologiques entre quatre especes d'Hymenolepis (H. diminuta, H. tualatinensis, H. weldensis, H. geomydis). L'analyse permettait de classifier un individu dans un groupe particulier et de distinguer les especes.