Robert S. Voss's research while affiliated with American Museum of Natural History and other places

Publications (86)

Article
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The current literature on marsupial phylogenetics includes numerous studies based on analyses of morphological data with limited sampling of Recent and fossil taxa, and many studies based on analyses of molecular data with dense sampling of Recent taxa, but few studies have combined both data types. Another dichotomy in the marsupial phylogenetic l...
Article
In this report, the fourth of a revisionary series on mouse opossums (Marmosa), we treat the members of a monophyletic group of trans-Andean taxa that include M. alstoni (Allen, 1900); M. nicaraguae Thomas, 1905; and M. adleri, a new species. Although cytochrome b sequence divergence values among these species are substantially lower than distances...
Preprint
Full-text available
The current literature on marsupial phylogenetics includes numerous studies based on analyses of morphological data with relatively limited sampling of Recent and fossil taxa, and many studies based on analyses of molecular data that include a dense sampling of Recent taxa, but relatively few that combine both data types. Another dichotomy in the m...
Article
The purpose of this application, under Article 23.9.3 of the Code, is to conserve the name Marmosa isthmicaGoldman, 1912 for a species of small Neotropical marsupial. This specific name, which has been used consistently for over a century, is threatened by a senior synonym, Marmosa reginaThomas, 1898, which has been applied incorrectly until very r...
Article
Phylogenetic analyses of molecular sequence data obtained from the holotype of Marmosa reginaThomas, 1898, together with a reassessment of its morphological characters indicate that this species does not belong to the subgenus Micoureus as previously believed. Instead, both molecular and phenotypic data are consistent with the hypothesis that M. re...
Article
Newly available molecular sequences and morphological data suggest that Philander nigratusThomas, 1923, is a valid species. Currently known from just eight specimens collected in the Peruvian departments of Junín and Ayacucho, P. nigratus does not appear to be closely related to either of the congeneric taxa with which it was previously synonymized...
Article
In this report, the second of a revisionary series on mouse opossums (Marmosa), we analyze cytochrome b sequence data from 166 specimens of the subgenus Micoureus and delimit putative species using the multirate Poisson Tree Processes (mPTP) method. That analysis identifies 21 putative species, many of which can be matched with available names, inc...
Article
DNA sequence data obtained from the 96 year old holotype of Marmosa elegans coquimbensisTate, 1931, support the hypothesis that this nominal taxon is a synonym or subspecies of Thylamys elegans (Waterhouse, 1839) and is not conspecific with T. pallidior (Thomas, 1902).
Article
This report is the third in our monographic series on mammalian diversity and Matses ethnomammalogy in the Yavarí-Ucayali interfluvial region of northeastern Peru. Based on taxonomic analysis of specimens collected in the region, we document the occurrence of 19 species of marsupials in the genera Caluromys, Glironia, Hyladelphys, Marmosa, Monodelp...
Article
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Didelphis marsupialis, type species of the genus Didelphis, is a widely distributed and commonly studied American marsupial. Unfortunately, the previously noncontroversial application of the epithet marsupialis Linnaeus, 1758, has recently been called into question, and the lectotype is no longer extant. To preserve long-standing binomial usage for...
Article
Cytochrome b sequences from South American specimens of the water opossum Chironectes minimus exhibit uncorrected pairwise differences of 0.6% or less among samples collected thousands of kilometers apart (in Guyana, Bolivia and southeastern Brazil). Despite published evidence of population divergence from recent analyses of craniodental morphology...
Article
This is the first installment of a revision of the didelphid marsupial genus Philander, commonly known as gray four-eyed opossums. Although abundant and widespread in lowland tropical forests from southern Mexico to northern Argentina, species of Philander are not well understood taxonomically, and the current literature includes many examples of c...
Article
This report continues our monographic analysis of mammalian diversity and Matses ethnomammalogy in the Yavarí-Ucayali interfluvial region of northeastern Peru. Based primarily on specimens collected in the region from 1926 to 2003, interviews with Matses hunters, and published sight surveys of large mammals, we document the local occurrence of 33 s...
Article
A new species of the nectarivorous bat genus Hsunycteris is described from lowland Amazonian forest in northeastern Peru. The new species, H. dashe, can be distinguished from other congeners by its larger size; V-shaped array of dermal chin papillae separated by a wide basal cleft; metacarpal V longer than metacarpal IV; broad rostrum; lateral marg...
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We describe a new species of the didelphid marsupial genus Monodelphis from Brazil, where it appears to be widely distributed in the states of Pará, Mato Grosso, Rondônia, and Acre. Monodelphis saci, new species, belongs to the subgenus Mygalodelphys, and analyses of DNA sequence data suggest that it is most closely related to M. handleyi, M. osgoo...
Article
The ecological mechanisms that sustain high species richness in Neotropical bat communities have attracted research attention for several decades. Although many ecologists have studied the feeding behavior and diets of Neotropical bats on the assumption that food is a limiting resource, other resource axes that might be important for species coexis...
Article
Members of the didelphid marsupial genus Monodelphis have previously been classified into species groups, but such informal subdivisions are inconsistent among authors and have contributed little but confusion to the taxonomic history of the genus. Recent molecular phylogenetic studies, however, have consistently recovered several strongly supporte...
Article
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In this report, the first installment of a comprehensive revision of the didelphid marsupial genus Marmosops, we revise the species of the subgenus Sciophanes. Based on morphological character variation among almost 300 examined specimens-which we interpret in the context of a previously published analysis of molecular sequence data-this revision r...
Article
To assess species-level diversity in the didelphid marsupial genus Marmosops, we obtained sequence data from the mitochondrial cytochrome b (CYTB) gene from >200 specimens, including exemplars of every currently recognized species together with multiple specimens of all geographically widespread forms. Analyses of these data using the general mixed...
Article
To infer historical-biogeographical patterns and processes in South America based on estimated divergence times and ancestral distributions for a diverse clade of small marsupials (Monodelphis). South America. We estimated a time-scaled phylogeny using sequence data from four nuclear genes and one mitochondrial gene for most currently recognized sp...
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Morphological character data are inadequate to resolve the evolutionary relationships of the didelphid genus Chacodelphys , which previous phylogenetic analyses have alternatively suggested might be the sister taxon of Lestodelphys and Thylamys (tribe Thylamyini) or of Monodelphis (tribe Marmosini) in the subfamily Didelphinae. Because fresh materi...
Article
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Robinson’s mouse opossum (Marmosa robinsoni) typically inhabits xeric shrublands, savannas, and deciduous forests from Panama through Colombia and Venezuela, to the islands of Trinidad, Tobago, and Grenada. We assessed its phylogeographic structure in the 1st such study based on dense geographic sampling of any vertebrate from dry habitats in this...
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To resolve phylogenetic relationships among species of Marmosa we analyzed DNA sequences from one mitochondrial and three nuclear genes for every member of the nominotypical subgenus and from four species of the subgenus Micoureus. As reported in previous studies, the subgenus Marmosa was found to be paraphyletic, whereas Micoureus was recovered as...
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Information is provided about the only known South American specimens of the cricetid rodent species Isthmomys pirrensis, which is otherwise known only from eastern Panama.
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The recent description of a new species of Amazonian tapir is inadequately supported by the genetic, morphological, and ethnographic information provided by the authors.
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Short-tailed opossums (genus Monodelphis) represent one of the most speciose clades of New World marsupials, with 26 currently recognized species that collectively range from eastern Panama to northern Argentina. Here we present the first phylogenetic analyses of the genus based on dense taxonomic sampling and multiple genes. From most sampled spec...
Article
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Species of Thyroptera are insectivorous foliage-roosting bats that inhabit lowland moist forests (including gallery formations in savanna landscapes) from Mexico to southeastern Brazil. Although four species are currently recognized, only one or two species were previously known to occur at most localities. Recent inventory work in northeastern Per...
Article
The geological record of South American mammals is spatially biased because productive fossil sites are concentrated at high latitudes. As a result, the history of mammalian diversification in Amazonia and other tropical biomes is largely unknown. Here we report diversification analyses based on a time-calibrated molecular phylogeny of opossums (Di...
Article
A new species of the didelphid marsupial genus Marmosops is described from the Pakaraima Highlands of western Guyana and from two highland sites in eastern Venezuela. All known specimens were collected on sandstone table mountains (eroded fragments of the Roraima Formation) in the eastern subregion of Pantepui. The new species, M. pakaraimae, is on...
Article
Opossums and pitvipers are sympatric throughout most of the New World, but trophic relationships between these speciose clades have only recently attracted the attention of researchers. Although it is now known that some venom-resistant opossums prey on pitvipers, a review of the literature on diets shows that some Neotropical pitvipers prey on opo...
Article
Phylogenetic analyses of cytochrome-b sequence data from 13 of the 15 currently recognized species of New World porcupines were used to test competing taxonomic hypotheses and to explore scenarios of morphological evolution and biogeography. Consistent with previous studies, the monophyly of Erethizontidae (Chaetomys + Erethizon + Coendou) and the...
Article
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A new species of the didelphid marsupial genus Monodelphis is described from the eastern Bolivian province of Santa Cruz. The new species, currently known from a single specimen, belongs to the M. brevicaudata group but differs from other taxa within that clade (M. brevi-caudata, M. domestica, M. glirina, M. maraxina, and M. palliolata) in size, qu...
Article
Mammals that prey on venomous snakes include several opossums (Didelphidae), at least two hedgehogs (Erinaceidae), several mongooses (Herpestidae), several mustelids, and some skunks (Mephitidae). As a group, these taxa do not share any distinctive morphological traits. Instead, mammalian adaptations for ophiophagy seem to consist only in the abili...
Article
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The rapid evolution of venom toxin genes is often explained as the result of a biochemical arms race between venomous animals and their prey. However, it is not clear that an arms race analogy is appropriate in this context because there is no published evidence for rapid evolution in genes that might confer toxin resistance among routinely envenom...
Article
The erethizontid rodent genus Coendou (including Echinoprocta and Sphiggurus) contains 13 valid species that live in tropical and subtropical forests from Mexico to Uruguay. This report tabulates information about the type material of all Recent nominal taxa referred to the genus, provides synonymies of all species recognized as valid, describes ge...
Article
This report is the first installment of a monographic study of mammalian diversity and ethnomammalogy in a sparsely inhabited rainforest region between the Yavarí and Ucayali rivers in northeastern Peru. Our study is based on several large collections of mammals (totaling about 3500 specimens) made at various localities in this region between 1926...
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Species of the didelphid marsupial genus Thylamys, commonly known as fat-tailed mouse opossums, are broadly distributed in the open habitats of central and southern South America. In this report we examine species limits in the genus and infer phylogenetic relationships among Thylamys species using both molecular phylogenetic and morphological meth...
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We report the discovery of a new species of doglike bat (Peropteryx) from the lowland Amazonian forests of Ecuador and Peru. It has transparent wing membranes that are faintly tinged brown with pale-brown arms and digits; ears that are separated on the forehead; and a skull with small, shallow pterygoid pits that are anterolateral to an undivided b...
Article
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The genus Marmosa contains 15 currently recognized species, of which nine are referred to the subgenus Marmosa, and six to the subgenus Micoureus. Recent revisionary research based on morphological data, however, suggests that the subgenus Marmosa is more diverse than the currently accepted taxonomy indicates. Herein we report phylogenetic analyses...
Article
We revise the nominal species of mouse opossums currently synonymized with Marmosa mexicana Merriam, 1897, and M. robinsoni Bangs, 1898, which include all of the trans-Andean taxa currently assigned to the nominotypical subgenus of Marmosa. In addition, we redescribe two other species that appear to be closely related to M. mexicana and M. robinson...
Article
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Six species of Paraguayan didelphid marsupials (opossums) were described by the Spanish naturalist Félix de Azara (1742–1821), whose nontechnical accounts were the basis for Latin binomials in current use for several species. Unfortunately, some of Azara's descriptions are problematic and have long been a source of taxonomic confusion. In particula...
Article
Neotropical porcupines of the Coendou vestitus group consist of four small-bodied species from northwestern South America that are hypothesized to form a clade on the basis of their unique dorsal pelage composition. In addition to soft wool and barbed quills—hair types widely shared by other erethizontids—the dorsal pelage of vestitus-group porcupi...
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Micronycteris sensu stricto is a diverse group of small to medium-sized phyllostomid bats characterized by large rounded pinnae that are connected at the base by an interauricular band of skin. Eight species are currently recognized, including three with dark venters (hirsuta, megalotis, microtis) and five with pale venters (brosseti, sanborni, sch...
Article
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Five nominal species of small didelphid marsupials previously referred to Gracilinanus differ conspicuously from the type species (G. microtarsus) and from all of the other valid taxa that we recognize as members of that genus (G. aceramarcae, G. agilis, G. dryas, G. emiliae, G. marica). These anomalous forms can be distinguished morphologically fr...
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In order to facilitate much-needed revisionary research on Marmosops, we summarize the currently accepted species-level taxonomy, provide full bibliographic citations for original descriptions of all 36 included nominal taxa, map their type localities, and list their type material (if known). We rediagnose the genus Marmosops, compare it with three...
Article
This report describes the results of nonvolant mammal inventory fieldwork at Paracou, a lowland rainforest locality in northern French Guiana, and concludes the faunal analysis introduced by our previous monograph on the bats of Paracou (Simmons and Voss, 1998). Working within a 3–km radius over the course of 202 sampling dates from 1991 to 1994, w...
Article
A new species of the murid rodent genus Thomasomys is described from the Cordillera Oriental of eastern Ecuador, a major range of the northern Andes that remains almost completely unexplored mammalogically. In order to provide a baseline for future faunal inventory work in these mountains, this report summarizes specimen data from the vicinity of P...
Article
In order to test the results of a previous study of didelphid marsupial phylogeny based on IRBP nuclear gene sequences (Jansa and Voss, 2000. Phylogenetic studies on didelphid marsupials I. Introduction and preliminary results from nuclear IRBP gene sequences. Journal of Mammalian Evolution 7: 43–77), we surveyed external, cranial, dental, and kary...
Article
This report summarizes a decade of morphological and molecular research on the phylogenetic relationships of didelphid marsupials (opossums), a substantially intact radiation of New World metatherian mammals. We review the comparative morphology of Recent opossums, emphasizing those anatomical systems from which taxonomically useful information is...
Article
Gracilinanus emiliae is a species of gracile mouse opossum that is currently known from fewer than a dozen specimens. The material we examined exhibits a distinctive suite of external and craniodental characters that are unlike those of any other congeneric species. We review all published records for G. emiliae, several of which are based on misid...
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The type material of Oryzomys curasoae McFarlane and Debrot, 2001, an allegedly extinct species from the island of Curaçao, Netherlands Antilles, is morphologically indistinguishable from O. gorgasi Hershkovitz, 1971, a Recent mangrove-inhabiting species from mainland Venezuela. A phylogenetic analysis suggests that the latter belongs to the genus...
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Although theoretical studies have suggested that base-compositional heterogeneity can adversely affect phylogenetic reconstruction, only a few empirical examples of this phenomenon, mostly among ancient lineages (with divergence dates > 100 Mya), have been reported. In the course of our phylogenetic research on the New World marsupial family Didelp...
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In order to achieve a monophyletic classification of oryzomyine rodents, 10 new genera are described for species or species groups previously referred to the polyphyletic genus Oryzomys. The following names are proposed: Aegialomys, n.gen. (for the ''xanthaeolus group'' of authors); Cerradomys, n.gen. (for the ''subflavus group''); Eremoryzomys, n....
Article
Selection at the protein-level can influence nucleotide substitution patterns for protein-coding genes, which in turn can affect their performance as phylogenetic characters. In this study, we compare two protein-coding nuclear genes that appear to have evolved under markedly different selective constraints and evaluate how selection has shaped the...
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Phylogenetic analyses of sequence data from the nuclear gene encoding the interphotoreceptor retinoid-binding protein (Irbp) provide compelling evidence that the recently described Amazonian marsupial genus Hyladelphys is a didelphid and suggest that it occupies an internal branch separating the traditionally recognized subfamilies Caluromyinae and...
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The holotype and only known specimen of Marmosa formosa Shamel, a nominal species currently synonymized with Gracilinanus agilis Burmeister, is strikingly unlike any other known didelphid marsupial. Phylogenetic analyses based on nonmolecular characters and IRBP sequences suggest that formosa is either the sister-taxon of Thylamys (including Lestod...
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Two nominal species of Neotropical murid rodents (subfamily Sigmodontinae) that have long been referred to different genera are here placed in a new genus in recognition of their distinctness from other named supraspecific taxa. Aepeomys fuscatus Allen and Oryzomys intectus Thomas share a unique combination of external and craniodental character st...
Article
Micronycteris sensu stricto is a diverse group of small to medium-sized phyllostomid bats characterized by large rounded pinnae that are connected at the base by an interauricular band of skin. Eight species are currently recognized, including three with dark venters (hirsuta, megalotis, microtis) and five with pale venters (brosseti, sanborni, sch...
Article
This report describes the results of nonvolant mammal inventory fieldwork at Paracou, a lowland rainforest locality in northern French Guiana, and concludes the faunal analysis introduced by our previous monograph on the bats of Paracou (Simmons and Voss, 1998). Working within a 3-km radius over the course of 202 sampling dates from 1991 to 1994, w...
Article
We report and analyze nucleotide sequence variation in the first exon (1158 bp) of the nuclear gene encoding the Interphotoreceptor Retinoid Binding Protein (IRBP) among 21 species representing all 15 currently recognized genera of living didelphids. Six previously published IRBP sequences representing five nondidelphimorph marsupial orders were al...
Article
The area around Saul, French Guiana, offers easy access to undisturbed lowland primary rainforest as well as cleared and disturbed areas near human settlements. Fieldwork conducted at Les Eaux Claires (a homestead 7 km N of Saul) in July and August 1999 resulted in capture of 40 species of bats, including 17 species previously unknown from the area...
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The Matses Indians of northeastern Perú recognize two linguistically labeled folk species of saki monkeys (Cebidae: Pithecia) that are said to be morphologically distinguishable, to prefer different habitats, and to be noninterbreeding. Because the systematic literature recognizes only one biological taxon of Pithecia in the area inhabited by the M...
Article
This report describes the results of bat inventory fieldwork at Paracou, a lowland rainforest locality in northern French Guiana. Working within a 3-km radius over the course of 168 sampling days from 1991 to 1994, we captured 3126 bats, of which about 78% were taken in ground-level mistnets, 10% in mistnets suspended above ground level, and 12% at...
Article
First principal components extracted from covariance matrices of log-transformed craniodental measurements closely approximate general size factors within field-collected samples representing 14 species in seven Neotropical muroid genera; because these samples are mixed-cross-sectional, scores are age-correlated and coefficients reflect postweaning...
Article
First principal components extracted from covariance matrices of log-transformed craniodental measurements closely approximate general size factors within field-collected samples representing 14 species in seven Neotropical muroid genera; because these samples are mixed-cross-sectional, scores are age-correlated and coefficients reflect postweaning...
Article
Laboratory colonies of the Neotropical muroid rodent Zygodontomys brevicauda have been employed in studies of arbovirus epidemiology and are currently the subjects of experimental research on tropical mammalian reproductive physiology and evolutionary quantitative genetics. Captive-bred litters typically consist of 4 or 5 pups weighing 3-4 g each a...