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Robert P Anderson - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic analyses of spiny pocket mice Heteromyidae heteromyinae based on allozymic and morphological data
Journal of Mammalogy, 2006Co-Authors: Marcelo Weksler, Robert P Anderson, Duke S RogersAbstract:Abstract The subfamily Heteromyinae (spiny pocket mice) represents a well-defined monophyletic group within the rodent family Heteromyidae. Although 2 genera of spiny pocket mice, Heteromys and Liomys, are recognized in the subfamily, no phylogenetic analysis has demonstrated their reciprocal monophyly. A recent study using DNA-sequence data from the mitochondrial gene cytochrome b suggested that Liomys is paraphyletic but included few species of Heteromys. Here, we conduct phylogenetic analyses of the subfamily with dense taxonomic sampling using allozymic data from a previous study and external and cranial morphological data; our aim is to assess generic monophyly and elucidate phylogenetic structure within the genera, to the degree possible with these data. We also reidentify selected voucher specimens from the allozymic study. Parsimony-based analyses indicate 3 clades in the subfamily: (A) Liomys irroratus, L. pictus, and L. spectabilis; (B) L. adspersus and L. salvini; and (C) all examined species o...
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a new montane species of spiny pocket mouse rodentia Heteromyidae heteromys from northwestern costa rica
American Museum Novitates, 2006Co-Authors: Robert P Anderson, Robert M TimmAbstract:Abstract Recent taxonomic works have recognized only two species of spiny pocket mice of the genus Heteromys (Rodentia: Heteromyidae) from Costa Rica. Within Costa Rica, the widespread H. desmarestianus is considered to occur throughout the wet Caribbean lowlands, as well as at middle and high elevations on the Caribbean and Pacific slopes of the country's main montane systems. In contrast, H. oresterus is known from only a few localities at high elevations in the western portion of the Cordillera de Talamanca in central Costa Rica. Our morphological and morphometric analyses of specimens from northwestern Costa Rica reveal the presence of an undescribed species of the genus, which we describe as Heteromys nubicolens. This new species ranges from 750 to 1840 m in elevation in the Cordillera de Tilaran and Cordillera de Guanacaste. Heteromys desmarestianus is found in the surrounding mesic lowlands and foothills. Externally, both species possess dark brown dorsal pelage, but H. nubicolens differs by overal...
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taxonomy distribution and natural history of the genus heteromys rodentia Heteromyidae in western venezuela with the description of a dwarf species from the peninsula de paraguana
American Museum Novitates, 2003Co-Authors: Robert P AndersonAbstract:Abstract Heteromys anomalus is widely distributed along the Caribbean coast of South America and was generally considered the only spiny pocket mouse present in Venezuela until H. australis was reported recently from the Cordillera de Merida. Here, I revise the spiny pocket mice of western Venezuela and compare specimens from the semi-insular Peninsula de Paraguana with samples from throughout the distributional area of H. anomalus. Morphological comparisons with all other species of the genus suggest that the Heteromys from Paraguana are closely related to H. anomalus, but univariate and multivariate analyses show that they are much smaller than samples of H. anomalus. In addition, adults from Paraguana display differences in cranial shape when compared with adults of H. anomalus. Hence, specimens from Paraguana are here described as a new species, Heteromys oasicus, and taxonomic treatments of H. anomalus and H. australis in western Venezuela are also provided. Although the original geographic context o...
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a new species of spiny pocket mouse Heteromyidae heteromys endemic to western ecuador
American Museum Novitates, 2002Co-Authors: Robert P Anderson, Pablo JarrinvAbstract:Whereas previous treatments have considered Heteromys australis the only spiny pocket mouse present in Ecuador, morphological and morphometric analyses of specimens from Ec- uador and southwestern Colombia reveal the presence of two species of the genus. Heteromys australis is distributed in evergreen forests from eastern Panamaand western Venezuela through Colombia to extreme northwestern Ecuador, where it inhabits wet, unseasonal areas of the Chocoand adjacent western slopes of the Andes. We here describe a new species, Heteromys teleus, found only in evergreen forests of central-western Ecuador, in areas less mesic and more seasonal than those characteristic of H. australis. Both species possess dark gray dorsal pelage, but H. teleus differs by larger (nonoverlapping) measurements of the hind foot and distinctive cranial proportions. Most notably, the rostrum of the new species is strik- ingly wide and massive, and the interparietal is narrow and rounded (in contrast to the wide, diamond-shaped interparietal of H. australis). The ranges of the two species together conform to the previously recognized Chocoan evergreen-forest fauna of western Colombia and north- western Ecuador. However, the restriction of H. teleus to evergreen but seasonal forests of the southern Choco ´ (transitional between the relatively unseasonal evergreen forests of the central Chocoto the north and highly seasonal xeric regions to the south) is unique within currently
Robert M Timm - One of the best experts on this subject based on the ideXlab platform.
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genetic relationships of caribbean lowland spiny pocket mice heteromys desmarestianus rodentia Heteromyidae evidence of a distinct mitochondrial lineage
Therya, 2019Co-Authors: Andrea Romero, Mark E Mort, Andrew J Dewoody, Robert M TimmAbstract:Genetic studies provide important insights into the evolutionary history and taxonomy of species, allowing us to identify lineages difficult to distinguish morphologically. The relationship among species in the genus Heteromys has been in flux as new species have been described, and candidate species have been suggested in the H. desmarestianus group. One new potential species may be in Costa Rica’s Caribbean lowlands. Herein, we test the phylogenetic relationship of individuals from Costa Rica’s Caribbean lowlands to individuals from throughout the species’ range using mitochondrial sequences from cytochrome-b (cytb). We captured 116 individuals from the lowlands, sequenced their cytb genes, and incorporated 74 GenBank sequences from throughout the species’ range to test if individuals from Costa Rica’s Caribbean lowlands potentially constitute an undescribed species. Our results document a distinct mitochondrial lineage in the Caribbean lowlands of Costa Rica. Our results from extensive sampling within the lowlands show a unique mitochondrial DNA lineage, which may suggest the presence of an undescribed species. The Caribbean lowlands of Costa Rica may hold other cryptic diversity, and further phylogenetic studies should incorporate samples from this area, as it may have a unique evolutionary history.
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a new montane species of spiny pocket mouse rodentia Heteromyidae heteromys from northwestern costa rica
American Museum Novitates, 2006Co-Authors: Robert P Anderson, Robert M TimmAbstract:Abstract Recent taxonomic works have recognized only two species of spiny pocket mice of the genus Heteromys (Rodentia: Heteromyidae) from Costa Rica. Within Costa Rica, the widespread H. desmarestianus is considered to occur throughout the wet Caribbean lowlands, as well as at middle and high elevations on the Caribbean and Pacific slopes of the country's main montane systems. In contrast, H. oresterus is known from only a few localities at high elevations in the western portion of the Cordillera de Talamanca in central Costa Rica. Our morphological and morphometric analyses of specimens from northwestern Costa Rica reveal the presence of an undescribed species of the genus, which we describe as Heteromys nubicolens. This new species ranges from 750 to 1840 m in elevation in the Cordillera de Tilaran and Cordillera de Guanacaste. Heteromys desmarestianus is found in the surrounding mesic lowlands and foothills. Externally, both species possess dark brown dorsal pelage, but H. nubicolens differs by overal...
Pablo Jarrinv - One of the best experts on this subject based on the ideXlab platform.
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a new species of spiny pocket mouse Heteromyidae heteromys endemic to western ecuador
American Museum Novitates, 2002Co-Authors: Robert P Anderson, Pablo JarrinvAbstract:Whereas previous treatments have considered Heteromys australis the only spiny pocket mouse present in Ecuador, morphological and morphometric analyses of specimens from Ec- uador and southwestern Colombia reveal the presence of two species of the genus. Heteromys australis is distributed in evergreen forests from eastern Panamaand western Venezuela through Colombia to extreme northwestern Ecuador, where it inhabits wet, unseasonal areas of the Chocoand adjacent western slopes of the Andes. We here describe a new species, Heteromys teleus, found only in evergreen forests of central-western Ecuador, in areas less mesic and more seasonal than those characteristic of H. australis. Both species possess dark gray dorsal pelage, but H. teleus differs by larger (nonoverlapping) measurements of the hind foot and distinctive cranial proportions. Most notably, the rostrum of the new species is strik- ingly wide and massive, and the interparietal is narrow and rounded (in contrast to the wide, diamond-shaped interparietal of H. australis). The ranges of the two species together conform to the previously recognized Chocoan evergreen-forest fauna of western Colombia and north- western Ecuador. However, the restriction of H. teleus to evergreen but seasonal forests of the southern Choco ´ (transitional between the relatively unseasonal evergreen forests of the central Chocoto the north and highly seasonal xeric regions to the south) is unique within currently
Duke S Rogers - One of the best experts on this subject based on the ideXlab platform.
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taxonomic status and species limits of perognathus rodentia Heteromyidae in the southern great plains
Southwestern Naturalist, 2010Co-Authors: Brandi S Coyner, Duke S Rogers, Thomas E Lee, Ronald A Van Den BusscheAbstract:The cytochrome-b gene was sequenced and data were analyzed for 104 Perognathus from localities in Mexico, Arizona, California, New Mexico, Oklahoma, and Texas to evaluate the validity of P. flavus and P. merriami and to assess the occurrence of species of Perognathus in Oklahoma. Unweighted- parsimony, minimum-evolution, maximum-likelihood (TrN+I+G), and Bayesian analyses revealed seven well-supported terminal clades corresponding to currently recognized species of Perognathus. Results validate recognition of P. flavus and P. merriami as distinct species, document the occurrence of P. merriami within Oklahoma, and reveal a second potential contact zone between P. flavus and P. merriami in the Oklahoma Panhandle. RESUMEN—El gen cytochroma-b de 104 ejemplares de Perognathus de localidades en Mexico, Arizona, California, Nuevo Mexico, Oklahoma, y Texas fueron secuenciados y los datos analizados a fin de convalidar las especies P. flavus y P. merriami y para evaluar la presencia de las especies de Perognathus en Oklahoma. Los analisis filogeneticos (parsimonia sin peso, evolucion mo probabilidad maxima (TrN+I+G), y el de Bayes) revelaron la existencia de siete clados terminales bien apoyados que corresponden a las especies de Perognathus actualmente conocidas. Los resultados confirman la validez de las especies P. flavus y P. merriami, documentan la presencia de P. merriami en el estado de Oklahoma, y revelan una segunda zona potencial de contacto entre P. flavus y P. merriami en el area noroeste del estado de Oklahoma conocido como el panhandle (mango de la sarten).
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basal clades and molecular systematics of heteromyid rodents
Journal of Mammalogy, 2007Co-Authors: John C. Hafner, Jessica E Light, David J Hafner, Emily Reddington, Duke S Rogers, Mark S. Hafner, Brett R RiddleAbstract:The New World rodent family Heteromyidae shows a marvelous array of ecomorphological types, from bipedal, arid-adapted forms to scansorial, tropical-adapted forms. Although recent studies have resolved most of the phylogenetic relationships among heteromyids at the shallower taxonomic levels, fundamental questions at the deeper taxonomic levels remain unresolved. This study relies on DNA sequence information from 3 relatively slowly evolving mitochondrial genes, cytochrome c oxidase subunit I, 12S, and 16S, to examine basal patterns of phylogenesis in the Heteromyidae. Because slowly evolving mitochondrial genes evolve and coalesce more rapidly than most nuclear genes, they may be superior to nuclear genes for resolving short, basal branches. Our molecular data (2,381 base pairs for the 3-gene data set) affirm the monophyly of the family and resolve the major basal clades in the family. Alternative phylogenetic hypotheses of subfamilial relationships are examined statistically and the Perognathinae and Heteromyinae are found to represent sister clades relative to the Dipodomyinae. The 3 traditional subfamilial groupings are supported; the controversial placement of Microdipodops as a sister clade to Dipodomys in the Dipodomyinae is affirmed, Perognathus and Chaetodipus are distinct sister clades within the Perognathinae, and species of Liomys and Heteromys form the resolved clade Heteromyinae. However, Liomys is found to be paraphyletic relative to Heteromys and, given that this finding corroborates earlier studies, we present a formal taxonomy of Heteromys wherein we place Liomys in synonymy. Semiparametric and parametric methods are used to estimate divergence times from our molecular data and a chronogram of the Heteromyidae, calibrated by the oldest known fossils of Dipodomys and Perognathus ,i s presented. Our time estimates reveal subfamilial differentiation in the early Miocene (22.3‐21.8 million years ago) and pose testable times of divergence for the basal heteromyid nodes. With the basal heteromyid clades resolved and cladogenic events positioned in a time framework, we review the major geological and paleoecological events of the Oligocene and Miocene associated with the early historical biogeography of the family.
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phylogenetic analyses of spiny pocket mice Heteromyidae heteromyinae based on allozymic and morphological data
Journal of Mammalogy, 2006Co-Authors: Marcelo Weksler, Robert P Anderson, Duke S RogersAbstract:Abstract The subfamily Heteromyinae (spiny pocket mice) represents a well-defined monophyletic group within the rodent family Heteromyidae. Although 2 genera of spiny pocket mice, Heteromys and Liomys, are recognized in the subfamily, no phylogenetic analysis has demonstrated their reciprocal monophyly. A recent study using DNA-sequence data from the mitochondrial gene cytochrome b suggested that Liomys is paraphyletic but included few species of Heteromys. Here, we conduct phylogenetic analyses of the subfamily with dense taxonomic sampling using allozymic data from a previous study and external and cranial morphological data; our aim is to assess generic monophyly and elucidate phylogenetic structure within the genera, to the degree possible with these data. We also reidentify selected voucher specimens from the allozymic study. Parsimony-based analyses indicate 3 clades in the subfamily: (A) Liomys irroratus, L. pictus, and L. spectabilis; (B) L. adspersus and L. salvini; and (C) all examined species o...
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genie differentiation in spiny pocket mice of the liomys pictus species group family Heteromyidae
Canadian Journal of Zoology, 1992Co-Authors: Duke S Rogers, Mark D EngstromAbstract:Electromorphic variation at 33 presumptive genetic loci within and among samples of the Liomys pictus species-group from western, southern, and eastern Mexico was examined. Levels of heterozygosity and polymorphism within samples were low when compared with those of rodents in general, and genie divergence among samples was very high, resulting in a discontinuous distribution of alleles among localities. We hypothesize that some of these geographic discontinuities result from intrinsic barriers to gene flow within L. pictus. Genie variation in or near zones of overlap suggest that the following pairs of taxa segregate as distinct biological species: L. p. plantinarensis and L. spectabilis; L. p. plantinarensis and L. p. pictus; L. p. hispidus and L. p. pictus. Liomys spectabilis is more similar genically to adjacent populations of L. p. pictus in northwestern Mexico than samples of L. pictus are to each other. As presently defined, L. pictus appears to be paraphyletic and probably is a composite of severa...
Jessica E Light - One of the best experts on this subject based on the ideXlab platform.
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checklist of ectoparasites of cricetid and heteromyid rodents in mexico
Therya, 2020Co-Authors: Jessica E Light, Roxana Acosta, Lance A Durden, Barry M Oconnor, Whitney C Preisser, Ralph P EckerlinAbstract:We present an updated checklist of ectoparasite species (including mites, ticks, lice, and fleas) infesting cricetid and heteromyid rodents (Rodentia: Cricetidae and Heteromyidae) in Mexico. For each parasite species, we include information on parasite taxonomy, host associations, collection localities, citations from the literature, and museum collections, when available. We recorded more than 172 mite, 114 flea, 22 tick, and 22 louse species from a minimum of 110 host species (82 cricetid and 28 heteromyid species) distributed across 31 states in Mexico. This work represents the most up-to-date and comprehensive checklist of ectoparasite species parasitizing cricetid and heteromyid rodents in Mexico.
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phylogeographic assessment of the heermann s kangaroo rat dipodomys heermanni
Journal of Mammalogy, 2019Co-Authors: Bridgett D Benedict, Adrian A Castellanos, Jessica E LightAbstract:The Heermann's kangaroo rat (Dipodomys heermanni; Rodentia: Heteromyidae) is a Californian endemic primarily found in the dry, gravelly grassland and open chaparral habitats of the San Joaquin Valley. Current taxonomy (based on morphology and habitat use) recognizes nine subspecies within this kangaroo rat species. Management practices of D. heermanni primarily are based on this classification, but this taxonomy may not accurately reflect unique lineages in need of conservation. Using molecular and morphological data, we performed a phylogeographic assessment of D. heermanni across the full geographic range of the species. Phylogenetic and network analyses of mitochondrial data from over 90 museum specimens (representing all nine subspecies distributed across the range of the species) revealed no substantial genetic differentiation within D. heermanni. Similarly, a geometric morphometric analysis of the crania of over 200 adult D. heermanni museum specimens (again representing all subspecies across the geographic distribution of species) resulted in no apparent morphological clustering across geography. Our results indicate that recognition of none of the nine subspecies is warranted and that conservation and management practices of D. heermanni are in need of revision.
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phylogeography and subspecies revision of the hispid pocket mouse chaetodipus hispidus rodentia Heteromyidae
Journal of Mammalogy, 2012Co-Authors: John J Andersen, Jessica E LightAbstract:The hispid pocket mouse (Chaetodipus hispidus) is one of the most genetically and morphologically divergent species within the heteromyid genus Chaetodipus. Four subspecies of C. hispidus currently are recognized, C. h. hispidus, C. h. paradoxus, C. h. spilotus, and C. h. zacatecae, ranging from North Dakota south through the Great Plains and Texas to central Mexico. We investigated the phylogeographic structure within C. hispidus by examining mitochondrial DNA from both freshly collected and museum specimens from localities distributed throughout the range of the species. We also examined 11 cranial characters in 303 specimens to assess morphological variation within the species. Although morphometric analyses were unable to differentiate the subspecies, phylogenetic analyses of molecular data indicated that the 4 currently recognized subspecies of C. hispidus are not genetically distinct. Instead, our results indicate that there are 4 distinct mitochondrial clades of C. hispidus that do not correspond to the currently recognized subspecies, but whose geographic limits instead coincide with major geographical features in the southern United States and northern Mexico. The Southern Coahuila filter-barrier (Durango and Coahuila), the Deming Plains (New Mexico), and the Balcones Escarpment (Texas) likely have acted as intermittent physical barriers to gene flow among the distinct mitochondrial clades, which we recognize as subspecies within C. hispidus.
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eight novel polymorphic microsatellites in the hispid pocket mouse chaetodipus hispidus and cross amplification in other perognathinae species rodentia Heteromyidae
Conservation Genetics Resources, 2012Co-Authors: John J Andersen, Mark A Renshaw, Jessica E LightAbstract:Twenty-eight nuclear microsatellites were isolated for the hispid pocket mouse, Chaetodipus hispidus, and characterized in 33 individuals from four genetically distinct groups throughout the geographic range of the species. Dinucleotide and trinucleotide microsatellite repeat motifs were screened, and of the 28 primer pairs created, eight amplified and were polymorphic. After correction for multiple tests, no loci deviated significantly from Hardy–Weinberg expectations. Working primers also were tested in other closely related species found within the subfamily Perognathinae. The microsatellite markers characterized in this study will be beneficial towards future population genetic research within the hispid pocket mouse and other Perognathinae rodents.
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isolation and characterization of 17 polymorphic microsatellite loci in the kangaroo mouse genus microdipodops rodentia Heteromyidae
Conservation Genetics Resources, 2010Co-Authors: Stacey L Lance, Jessica E Light, Kenneth L Jones, Cris Hagen, John C. HafnerAbstract:We isolated and characterized 17 microsatellite loci from kangaroo mice, Microdipodops megacephalus and M. pallidus. Loci were screened in 24 individuals from 21 general localities across their distributional range in the Great Basin Desert. In total, the number of alleles per locus ranged from 4 to 16, observed heterozygosity ranged from 0.333 to 1, and the probability of identity values ranged from 0.013 to 1. These loci provide new tools for examining the biogeographic history and population dynamics of Microdipodops in the context of molecular ecology.