Thorny-headed worms

Description of Mediorhynchus papillosus (Acanthocephala: Gigantorhynchidae) from a Colorado, U.S.A., population, with a discussion of morphology and geographical variability

Publication Type:Journal Article
Year of Publication:1998
Authors:O. M. Amin, Dailey M. D.
Journal:Journal of the Helminthological Society of WashingtonJ. Helminthol. Soc. Wash.
Pagination:189 - 200
Date Published:1998///
ISBN Number:1049233X (ISSN)
Keywords:Brazil, Bulgaria, China, Colorado, Mediorhynchus papillosus, Mediorhynchus papillosus morphology, Oreoscoptes montanus, Russia, Taiwan, U.S.A.

The original description of Mediorhynchus papillosus Van Cleave, 1916 included misinterpretations of such taxonomically important structures as proboscis armature. The species was briefly redescribed from Asian material by Schmidt and Kuntz (1977) as well as by various Russian and other workers before and after 1977. The present collection from Colorado provided important taxonomic information previously unreported or erroneously interpreted. The first description of M. papillosus from North American specimens collected from a sage thrasher, Oreoscoptes montanus Baird, 1858, in Colorado, U.S.A., is presented with new features reported for the first time. A comprehensive comparison of the North American, Asian, and Russian populations is presented and discussed. Mediorhynchus papillosus appears to be a geographically variable species, particularly in size of proboscis and its armature, and relative space occupied by the neck and posterior proboscis. The geographically isolated Taiwanese population was markedly different from the Colorado population; the latter was more similar to others from various Soviet republics, particularly the Ukraine. Distinctiveness of geographical populations appears to be related to geographical restrictions, intermediate and definitive host specificity and distribution, and host feeding behavior.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith