| the systematics of nematodes that cause ostertagiasis in domestic and wild ruminants in north america: an update and a key to species. | studies of medium stomach worms (subfamily ostertagiinae) of domestic and wild ruminants in north america have refined our understanding of the systematics, host distribution and biogeography of these nematodes. strong support for recognition of monophyly for the ostertagiinae has resulted from preliminary phylogenetic analyses of morphological characters among these and other trichostrongylids. evaluation of morphological and biochemical characters in our laboratory and elsewhere has not refute ... | 1993 | 8484224 |
| identification by polymerase chain reaction (pcr) of marshallagia marshalli and ostertagia gruehneri from svalbard reindeer. | a polymerase chain reaction (pcr) assay to identify two common abomasal nematodes marshallagia marshalli and ostertagia gruehneri of svalbard reindeer was developed. species-specific pcr primers were designed from internal transcribed spacer (its)-2 sequences of rdna and validated using morphologically identified adult male and female nematodes. using the species-specific primers, a 110 bp fragment was amplified from m. marshalli and its minor morph marshallagia occidentalis and a 149 bp fragmen ... | 2000 | 10899533 |
| discovery and description of a new trichostrongyloid species (nematoda: ostertagiinae), abomasal parasites in mountain goat, oreamnos americanus, from the western cordillera of north america. | marshallagia lichtenfelsi sp. n. is a dimorphic ostertagiine nematode occurring in the abomasum of mountain goats, oreamnos americanus, from the western cordillera of north america. major and minor morphotype males and females are characterized and distinguished relative to the morphologically similar marshallagia marshalli / marshallagia occidentalis from north america and marshallagia dentispicularis, along with other congeners, from the palearctic region. the configuration of the convoluted a ... | 2012 | 22316219 |