@article {40272, title = {Temporal congruence revisited: comparison of mitochondrial DNA sequence divergence in cospeciating pocket gophers and their chewing lice}, journal = {Systematic Biology}, volume = {45}, year = {1996}, month = {1996}, pages = {151 - 167}, abstract = {

Molecular phylogenies can be used to test hypotheses of cospeciation between hosts and parasites by comparing both cladistic relationships and branch lengths. Molecular data can also help discriminate between competing reconstructions of the history of the host-parasite association. Methods for comparing sequence divergence in hosts and parasites are described and applied to data for pocket gophers and their chewing lice. The hypothesis of cospeciation between these two clades is strongly supported. The lengths of homologous branches in the gopher and louse phylogenies are positively correlated, but there is little support for the hypothesis that lice are evolving an order of magnitude faster than are their hosts.

}, keywords = {analysis, assemblages, Chewing lice, clock, component, cospeciation, dna, Evolution, geomydoecus, Geomyidae, Geomys, gopher, host parasite, lice, lineages, Mallophaga, molecular, Orthogeomys, Phylogeny, pocket, sequence, speciation, substitutions, thomomydoecus, thomomys, tree, trees, trichodectidae}, url = {http://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/sysbio/45/2/10.1093/sysbio/45.2.151/2/45-2-151.pdf?Expires=1485178998\&Signature=Ot51qtPL0yKCXIoYGaXyDHFhW32zncDUkaJP357f8CU5td~btGv15S2jmYH8DOK8nSGL1a66mMoOQflCg02Fs47sv~qKstzYpYsm6kbvwqnA}, author = {Page,Roderic D. M.} } @article {39806, title = {Mammalian hair diameter as a possible mechanism for host specialization in chewing lice}, journal = {Journal of Mammalogy}, volume = {81}, year = {2000}, month = {2000}, pages = {999 - 1007}, abstract = {

We examined the relationship between mammalian hair diameter and body mass at several taxonomic levels (interordinal, intrafamilial, intrageneric, and intraspecific) and showed a significant, positive allometric relationship between hair diameter and body size at all taxonomic levels examined. The allometric coefficient (alpha) ranged from 0.13 to 0.33. Within pocket gophers (Geomyidae), a significant positive relationship exists between hair diameter and rostral groove dimensions of their chewing lice, Geomydoecus, which use the rostral groove to grasp hairs of their host. Coupled with previous evidence of a strong allometric relationship between rostral groove width and louse body size, our findings suggest that hair diameter of the host is an important determinant of body size in chewing lice that parasitize pocket gophers.

}, keywords = {body, Evolution, Geomyidae, gopher, hair, host, independent, mass, parasite, Phthiraptera, Phylogeny, pocket, rodentia, size, trichodectidae}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/2261.pdf}, author = {David L. Reed and Mark S. Hafner and Allen,Shannon K.} } @article {39397, title = {Pocket gophers and chewing lice: a test of the maternal transmission hypothesis}, journal = {Molecular Ecology}, volume = {7}, year = {1998}, month = {1998}, pages = {1065 - 1069}, abstract = {

The life-history traits of pocket gophers and their chewing lice suggest that there is little opportunity for transmission of parasites among pocket gophers, with the exception of transmission from mother to offspring. Herein, we test the hypothesis that lice are transmitted maternally by using an indirect approach that compares the distribution of louse populations to the distribution of mitochondrial DNA haplotypes in the pocket gophers. Comparison of the chewing louse distributions to the distribution of mtDNA haplotypes for the gophers revealed no significant concordance, and thus falsifies the maternal transmission hypothesis.

}, keywords = {coevolution, colonization, geomydoecus, Geomyidae, host, Mallophaga, mitochondrial dna, mtDNA, parasite, populations, RFLP, thomomys bottae, trichodectidae}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/0842.pdf}, author = {James W. Demastes and Mark S. Hafner and David J. Hafner and Theresa A. Spradling} } @article {39382, title = {Two new subgenera of chewing lice (Phthiraptera: Trichodectidae) from pocket gophers (Rodentia: Geomyidae), with a key to all included taxa}, journal = {Journal of Medical Entomology}, volume = {31}, year = {1994}, month = {1994}, pages = {450-466}, type = {Proof copy of article }, abstract = {

Proof copy: The new subgenera Thaelerius and Jamespattonius are described, respectively, for the eight species of Geomydoecus in the thomomyus complex of lice and the four species of Thomomydoecus in the wardi complex. Except for T. byersi Hellenthal \& Price from Thomomys bottae (Eydoux \& Gervais), these lice are restricted to the Thomomys talpoides (Richardson) complex of pocket gophers and are the only lice found on these hosts. A key is given for the identification of the currently recognized 122 taxa of pocket gopher lice.

}, keywords = {complex, geomydoecus, mtax, PHP, thomomydoecus, trichodectidae}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/0825.pdf}, author = {Hellenthal,Ronald A. and Roger D. Price} } @article {38796, title = {Biosystematics of the chewing lice of pocket gophers}, journal = {Annual Review of Entomology}, volume = {36}, year = {1991}, note = {PHP;; Basically a review of the pocket gophers and their chewing lice up until 1991. A good summery of the studies conducted by the key workers in the field thus far.}, month = {1991}, pages = {185 - 203}, keywords = {complex, differentiation, genetic, geomydoecus, Geomyidae, Mallophaga, rodentia, subgenus, talpoides, thomomys, thomomys bottae, trichodectidae, U.S.A.}, url = {https://phthiraptera.myspecies.info/sites/phthiraptera.info/files/0098.pdf}, author = {Hellenthal,Ronald A. and Roger D. Price} } @article {38719, title = {Disparate rates of molecular evolution in cospeciating hosts and parasites}, journal = {Science}, volume = {265}, year = {1994}, month = {1994}, pages = {1087 - 1090}, abstract = {

DNA sequences for the gene encoding mitochondrial cytochrome oxidase I in a group of rodents (pocket gophers) and their ectoparasites provide evidence for cospeciation and reveal different rates of molecular evolution in the hosts and their parasites. The overall rate of nucleotide substitution (both silent and replacement changes) is approximately three times higher in lice, and the rate of synonymous substitution (based on analysis of fourfold degenerate sites) is approximately an order of magnitude greater in lice. The difference in synonymous substitution rate between lice and gophers correlates with a difference in similar magnitude in generation times.

}, keywords = {base, differentiation, genetic, genome, geomydoecus, Geomyidae, gopher, Mallophaga, mitochondrial dna, Phylogeny, pocket, rodentia, substitutions, trees, trichodectidae}, url = {http://www.phthiraptera.info/sites/phthiraptera.info/files/0004.pdf}, author = {Mark S. Hafner and Sudman,Philip D. and Villablanca,Francis X. and Theresa A. Spradling and James W. Demastes and Nadler,Steven A.} }