@article {46372, title = {Systematic relationships among pocket gopher chewing lice (Phthiraptera: Trichodectidae) inferred from electrophoretic data}, journal = {International journal for parasitology}, volume = {23}, year = {1993}, note = {LR: 20041117; JID: 0314024; ppublish}, month = {1993}, pages = {191 - 201}, address = {ENGLAND}, abstract = {

Multilocus starch-gel electrophoresis was used to obtain electrophoretic data for maximum parsimony, phenetic, and component analysis of systematic relationships among 14 species of pocket gopher chewing lice and two outgroup species. Pocket gopher lice studied included taxa representing seven of the 25 species complexes in Geomydoecus, and two of the four species complexes of Thomomydoecus. In pairwise comparisons, 12 of the 14 pocket gopher lice were characterized by two or more fixed genetic differences, and each nominal species possessed at least one fixed difference. These electrophoretic results are consistent with previous morphological analysis of species-level taxonomy. A maximum-parsimony analysis of the electrophoretic data yielded 80 trees, each with a length of 78 steps and a consistency index of 0.83. The strict consensus tree and the UPGMA phenogram of genetic distances indicate that five species of lice from Central American pocket gophers (Orthogeomys) form a clade distinct from lice hosted by North American pocket gophers (Geomys, Thomomys, and Cratogeomys). Other louse clades receiving reasonable support in bootstrap parsimony analysis include: (Thomomydoecus wardi, Th. minor); (Geomydoecus scleritus, G. mobilensis); (G. panamensis, G. setzeri); and (G. cherriei, G. costaricensis). The systematic results of this electrophoretic study are generally consistent with the boundaries of louse species complexes described previously.

}, keywords = {alleles, animals, electrophoresis, Lice Infestations/parasitology/veterinary, Mallophaga, Phylogeny, Research Support, U.S. Gov{\textquoteright}t, Non-P.H.S., Rodent Diseases/parasitology, rodentia}, isbn = {0020-7519}, doi = {dx.doi.org/10.1645/13-415.1}, url = {http://www.sciencedirect.com/science/article/pii/002075199390141K}, author = {Nadler,Steven A. and Mark S. Hafner} } @article {40279, title = {Taxonomic importance of first-instar chewing lice (Phthiraptera: Trichodectidae) from pocket gophers (Rodentia: Geomyidae)}, journal = {Annals of the Entomological Society of America}, volume = {89}, year = {1996}, month = {1996}, pages = {510 - 518}, abstract = {

A study of 1st-instar nymphs representing 119 of the 122 currently recognized taxa of pocket gopher lice of the genera Geomydoecus and Thomomydoecus resulted in the recognition of numerous valuable taxonomic features enabling reliable differentiation for a surprisingly large number of these lice. These characters are discussed primarily at the species complex level, with mention of specific differences where pertinent. A key is given for the identification of the currently recognized 26 complexes of pocket gopher lice.

}, keywords = {complex, geomydoecus, Mallophaga, mexico, rodentia, taxonomy, thomomydoecus, thomomys, U.S.A.}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/2985.pdf}, author = {Roger D. Price and Hellenthal,Ronald A.} } @article {38718, title = {Phylogeny of Geomydoecus and Thomomydoecus pocket gopher lice (Phthiraptera: Trichodectidae) inferred from cladistic analysis of adult and first instar morphology}, journal = {Systematic Entomology}, volume = {20}, year = {1995}, month = {1995}, pages = {129 - 143}, abstract = {

The phylogeny of all 122 species of chewing lice of the genera Geomydoecus and Thomomydoecus (Phthiraptera: Trichodectidae) hosted by pocket gophers (Rodentia: Geomyidae) is estimated by a cladistic analysis of fifty-eight morphological characters obtained from adults and first instars. The data set has considerable homoplasy, but still contains phylogenetic information. The phylogeny obtained is moderately resolved and, with some notable exceptions supports the species complexes proposed by Hellenthal and Price over the last two decades. The subgenera of G. (Thaelerius) and T. (Thomomydoecus)are both shown to be monophyletic , but the monophyly of subgenus T. (Jamespattonius) could not be confirmed, perhaps due to the lack of first instar data for one of its component species. The nominate subgenus of Geomydoecus may be monophyletic, but our cadogram was insufficiently resolved to corroberate this. Mapping the pocket gopher hosts on to the phylogeny reveals a consistant pattern of louse clades being restricted to particular genera or subgenera of gophers, but the history of the host-parasite association appears complex and will require considerable effort to resolve.

}, keywords = {assemblages, Chewing lice, complex, cospeciation, Evolution, Geomyidae, host parasite, lice, Mallophaga, mexico, rodentia, U.S.A.}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/0003.pdf}, author = {Page,Roderic D. M. and Roger D. Price and Hellenthal,Ronald A.} }