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Robert S Voss - One of the best experts on this subject based on the ideXlab platform.
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On the Identity of Victoria's Mouse Opossum, Marmosa regina Thomas, 1898
American Museum Novitates, 2020Co-Authors: Thomas C. Giarla, Robert S VossAbstract: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. regina is a senior synonym of M. isthmica Goldman, 1912, in the subgenus ExuloMarmosa. Because replacing isthmica with regina would create nomenclatural confusion, we recommend maintaining current usage of the former name and suppressing usage of the latter.
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DNA sequence data from the holotype of Marmosa elegans coquimbensis Tate, 1931 (Mammalia, Didelphidae) resolve its disputed relationships
American Museum Novitates, 2020Co-Authors: Thomas C. Giarla, Robert S VossAbstract: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).
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phylogenetic relationships of mouse opossums didelphidae Marmosa with a revised subgeneric classification and notes on sympatric diversity
American Museum Novitates, 2014Co-Authors: Robert S Voss, Eliecer E Gutierrez, Sergio Solari, Rogerio Vieira Rossi, Sharon A JansaAbstract:ABSTRACT 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 a robustly supported clade. Species currently referred to the subgenus Marmosa form four strongly supported and morphologically diagnosable groups. Based on these results we recognize a total of five subgenera: Marmosa Gray, 1821 (for macrotarsus, murina, tyleriana, and waterhousei); Micoureus Lesson, 1842 (for alstoni, constantiae, demerarae, paraguayana, phaea, and regina); StegoMarmosa Pine, 1972 (for andersoni and lepida); EoMarmosa, new subgenus (for rubra); and ExuloMarmosa, new subgenus (for isthmica, mexicana, robinsoni, simonsi, xerophila, and zeledoni). The best-supported hypothesis of relationships among these clades is ((StegoMarmosa (Marmo...
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molecular systematics of mouse opossums didelphidae Marmosa assessing species limits using mitochondrial dna sequences with comments on phylogenetic relationships and biogeography
American Museum Novitates, 2010Co-Authors: Eliecer E Gutierrez, Sharon A Jansa, Robert S VossAbstract: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 of sequence data from the mitochondrial cytochrome-b gene representing 12 of the 14 morphologically defined taxa recently treated as valid species of Marmosa (Marmosa) in the aforementioned revisionary work. These data provide a basis for testing the monophyly of morphologically defined taxa in the subgenus Marmosa, and they afford the first opportunity to assess phylogenetic relationships among the majority of species currently referred to the genus. Ten of 11 species of Marmosa (Marmosa) represented by multiple sequences in our analyses were recovered as monophyletic. In contrast, our samples of M. mexicana were recovered as two deeply divergent haplogroups that were not consistently associated as sister taxa. Among other results, our analyses support the recognition of M. isthmica and M. simonsi as species distinct from M. robinsoni, and the recognition of M. macrotarsus and M. waterhousei as species distinct from M. murina. The validity of three other species long recognized as distinct (M. rubra, M. tyleriana ,a ndM. xerophila) is also clearly supported by our results. Although cytochrome-b sequence data are not consistently informative about interspecific relationships in this study, we found
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A Revision of the Didelphid Marsupial Genus Marmosa Part 1. The Species in Tate's ‘Mexicana’ and ‘Mitis’ Sections and Other Closely Related Forms
Bulletin of the American Museum of Natural History, 2010Co-Authors: Rogerio Vieira Rossi, Robert S Voss, Darrin P. LundeAbstract:Abstract 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. robinsoni based on morphological or molecular citeria: M. rubra Tate, 1931, and M. xerophila Handley and Gordon, 1979. Based on first-hand examination of holotypes and other material (about 1500 specimens in total), we additionally recognize M. isthmica Goldman, 1912, and M. simonsi Thomas, 1899 (both currently synonymized with M. robinsoni), and M. zeledoni Goldman, 1917 (currently synonymized with M. mexicana), as valid species. For each of the seven species recognized as valid herein (M. mexicana, M. zeledoni, M. isthmica, M. robinsoni, M. xerophila, M. simonsi, M. rubra), we describe and illustrate diagnostic external and craniodental characters, tabulate m...
Rogerio Vieira Rossi - One of the best experts on this subject based on the ideXlab platform.
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Species diversity of Marmosa subgenus Micoureus (Didelphimorphia, Didelphidae) and taxonomic evaluation of the white-bellied woolly mouse opossum, Marmosa constantiae
Zoological Journal of the Linnean Society, 2019Co-Authors: Luan Gabriel De Lima Silva, Daniela Ferreira, Rogerio Vieira RossiAbstract:Abstract Marmosa subgenus Micoureus contains six currently recognized species, distributed from southern Belize to northern Argentina. Although recent studies have demonstrated the monophyly of the subgenus, the species have not been recently revised. Except for M. phaea, we evaluated the species diversity in this subgenus of mouse opossums using integrated morphological, morphometric and molecular data, with emphasis on M. constantiae. We used a total of 700 specimens for morphological and morphometric analyses. For phylogenetic, species delimitation, molecular variance and population structuring analyses (the latter two only for M. constantiae), we used the mitochondrial cytochrome b gene. Morphometric variation patterns were evaluated through Principal Component Analysis and Discriminant Function Analysis. Our results indicate that there are seven species in our samples. Among the species analysed morphologically, some can be discriminated by craniodental measurements and all can be discriminated through morphology. Marmosa constantiae is polyphyletic, composed of two lineages, one of which is correctly named M. budini. Marmosa constantiae (s.s.) has a well-known genetic structure, with no clear geographic structure and no consistent morphological patterns. Several records of M. demerarae in the literature correspond to M. constantiae. Marmosa demerarae may thus represent a complex formed of at least two species.
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phylogenetic relationships of mouse opossums didelphidae Marmosa with a revised subgeneric classification and notes on sympatric diversity
American Museum Novitates, 2014Co-Authors: Robert S Voss, Eliecer E Gutierrez, Sergio Solari, Rogerio Vieira Rossi, Sharon A JansaAbstract:ABSTRACT 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 a robustly supported clade. Species currently referred to the subgenus Marmosa form four strongly supported and morphologically diagnosable groups. Based on these results we recognize a total of five subgenera: Marmosa Gray, 1821 (for macrotarsus, murina, tyleriana, and waterhousei); Micoureus Lesson, 1842 (for alstoni, constantiae, demerarae, paraguayana, phaea, and regina); StegoMarmosa Pine, 1972 (for andersoni and lepida); EoMarmosa, new subgenus (for rubra); and ExuloMarmosa, new subgenus (for isthmica, mexicana, robinsoni, simonsi, xerophila, and zeledoni). The best-supported hypothesis of relationships among these clades is ((StegoMarmosa (Marmo...
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A Revision of the Didelphid Marsupial Genus Marmosa Part 1. The Species in Tate's ‘Mexicana’ and ‘Mitis’ Sections and Other Closely Related Forms
Bulletin of the American Museum of Natural History, 2010Co-Authors: Rogerio Vieira Rossi, Robert S Voss, Darrin P. LundeAbstract:Abstract 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. robinsoni based on morphological or molecular citeria: M. rubra Tate, 1931, and M. xerophila Handley and Gordon, 1979. Based on first-hand examination of holotypes and other material (about 1500 specimens in total), we additionally recognize M. isthmica Goldman, 1912, and M. simonsi Thomas, 1899 (both currently synonymized with M. robinsoni), and M. zeledoni Goldman, 1917 (currently synonymized with M. mexicana), as valid species. For each of the seven species recognized as valid herein (M. mexicana, M. zeledoni, M. isthmica, M. robinsoni, M. xerophila, M. simonsi, M. rubra), we describe and illustrate diagnostic external and craniodental characters, tabulate m...
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a revision of the didelphid marsupial genus Marmosa part 1 the species in tate s mexicana and mitis sections and other closely related forms
Bulletin of the American Museum of Natural History, 2010Co-Authors: Rogerio Vieira Rossi, Robert S Voss, Darrin P. LundeAbstract:Abstract 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. robinsoni based on morphological or molecular citeria: M. rubra Tate, 1931, and M. xerophila Handley and Gordon, 1979. Based on first-hand examination of holotypes and other material (about 1500 specimens in total), we additionally recognize M. isthmica Goldman, 1912, and M. simonsi Thomas, 1899 (both currently synonymized with M. robinsoni), and M. zeledoni Goldman, 1917 (currently synonymized with M. mexicana), as valid species. For each of the seven species recognized as valid herein (M. mexicana, M. zeledoni, M. isthmica, M. robinsoni, M. xerophila, M. simonsi, M. rubra), we describe and illustrate diagnostic external and craniodental characters, tabulate m...
Sharon A Jansa - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic relationships of mouse opossums didelphidae Marmosa with a revised subgeneric classification and notes on sympatric diversity
American Museum Novitates, 2014Co-Authors: Robert S Voss, Eliecer E Gutierrez, Sergio Solari, Rogerio Vieira Rossi, Sharon A JansaAbstract:ABSTRACT 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 a robustly supported clade. Species currently referred to the subgenus Marmosa form four strongly supported and morphologically diagnosable groups. Based on these results we recognize a total of five subgenera: Marmosa Gray, 1821 (for macrotarsus, murina, tyleriana, and waterhousei); Micoureus Lesson, 1842 (for alstoni, constantiae, demerarae, paraguayana, phaea, and regina); StegoMarmosa Pine, 1972 (for andersoni and lepida); EoMarmosa, new subgenus (for rubra); and ExuloMarmosa, new subgenus (for isthmica, mexicana, robinsoni, simonsi, xerophila, and zeledoni). The best-supported hypothesis of relationships among these clades is ((StegoMarmosa (Marmo...
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molecular systematics of mouse opossums didelphidae Marmosa assessing species limits using mitochondrial dna sequences with comments on phylogenetic relationships and biogeography
American Museum Novitates, 2010Co-Authors: Eliecer E Gutierrez, Sharon A Jansa, Robert S VossAbstract: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 of sequence data from the mitochondrial cytochrome-b gene representing 12 of the 14 morphologically defined taxa recently treated as valid species of Marmosa (Marmosa) in the aforementioned revisionary work. These data provide a basis for testing the monophyly of morphologically defined taxa in the subgenus Marmosa, and they afford the first opportunity to assess phylogenetic relationships among the majority of species currently referred to the genus. Ten of 11 species of Marmosa (Marmosa) represented by multiple sequences in our analyses were recovered as monophyletic. In contrast, our samples of M. mexicana were recovered as two deeply divergent haplogroups that were not consistently associated as sister taxa. Among other results, our analyses support the recognition of M. isthmica and M. simonsi as species distinct from M. robinsoni, and the recognition of M. macrotarsus and M. waterhousei as species distinct from M. murina. The validity of three other species long recognized as distinct (M. rubra, M. tyleriana ,a ndM. xerophila) is also clearly supported by our results. Although cytochrome-b sequence data are not consistently informative about interspecific relationships in this study, we found
Leonora Pires Costa - One of the best experts on this subject based on the ideXlab platform.
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New records of the rare little rufous mouse opossum, Marmosa lepida (Thomas,1888) (Mammalia, Didelphidae) in southeastern Amazonia, Brazil
Pensoft Publishers, 2018Co-Authors: Roger Rodrigues Guimarães, Ana Carolina Loss, Leonora Pires CostaAbstract:Here we present new records of the mouse opossum Marmosa (Stegomamosa) lepida (Thomas, 1888) collected in the recently flooded region of the Xingu River during the construction of the Belo Monte hydropower dam in the state of Pará, Brazil. This taxon is rarely captured, and it has often been misidentified as other similar genera of arboreal marsupials, such as Gracilinanus. Our specimens were identified morphologically and genetically using partial DNA of the mitochondrial cytochrome b gene. The new records increase the known distribution by about 250 km to the southeast. 
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The Araguaia River as an Important Biogeographical Divide for Didelphid Marsupials in Central Brazil
The Journal of heredity, 2015Co-Authors: Rita Gomes Rocha, Eduardo Ferreira, Ana Carolina Loss, Rasmus Heller, Carlos Fonseca, Leonora Pires CostaAbstract:The riverine barrier model suggests that rivers play a significant role in separating widespread organisms into isolated populations. In this study, we used a comparative approach to investigate the phylogeography of 6 didelphid marsupial species in central Brazil. Specifically, we evaluate the role of the mid-Araguaia River in differentiating populations and estimate divergence time among lineages to assess the timing of differentiation of these species, using mitochondrial DNA sequence data. The 6 didelphid marsupials revealed different intraspecific genetic patterns and structure. The 3 larger and more generalist species, Didelphis albiventris, Didelphis marsupialis, and Philander opossum, showed connectivity across the Araguaia River. In contrast the genetic structure of the 3 smaller and specialist species, Gracilinanus agilis, Marmosa (Marmosa) murina, and Marmosa (Micoureus) demerarae was shaped by the mid-Araguaia. Moreover, the split of eastern and western bank populations of the 2 latter species is consistent with the age of Araguaia River sediments formation. We hypothesize that the role of the Araguaia as a riverine barrier is linked to the level of ecological specialization among the 6 didelphid species and differences in their ability to cross rivers or disperse through the associated habitat types.
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Original Article The Araguaia River as an Important
2015Co-Authors: Biogeographical Divide, Rita Gomes Rocha, Eduardo Ferreira, Ana Carolina Loss, Rasmus Heller, Carlos Fonseca, Didelphid Marsupials, Leonora Pires CostaAbstract:The riverine barrier model suggests that rivers play a significant role in separating widespread organisms into isolated populations. In this study, we used a comparative approach to investigate the phylogeography of 6 didelphid marsupial species in central Brazil. Specifically, we evaluate the role of the mid-Araguaia River in differentiating populations and estimate divergence time among lineages to assess the timing of differentiation of these species, using mitochondrial DNA sequence data. The 6 didelphid marsupials revealed different intraspecific genetic patterns and structure. The 3 larger and more generalist species, Didelphis albiventris, Didelphis marsupialis, and Philander opossum, showed connectivity across the Araguaia River. In contrast the genetic structure of the 3 smaller and specialist species, Gracilinanus agilis, Marmosa (Marmosa) murina, and Marmosa (Micoureus) demerarae was shaped by the mid-Araguaia. Moreover, the split of eastern and western bank populations of the 2 latter species is consistent with the age of Araguaia River sediments formation. We hypothesize that the role of the Araguaia as a riverine barrier is linked to the level of ecological specialization among the 6 didelphid species and differences in their ability to cross rivers or disperse through the associated habitat types
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Highly conserved d-loop sequences in woolly mouse opossums Marmosa (Micoureus).
Mitochondrial DNA, 2012Co-Authors: Rita Gomes Rocha, Yuri L. R. Leite, Eduardo Ferreira, Juliana Justino, Leonora Pires CostaAbstract:This study reports the occurrence of highly conserved d-loop sequences in the mitochondrial genome of the woolly mouse opossum genus Marmosa subgenus Micoureus (Mammalia, Didelphimorphia, Didelphidae). Sixty-six sequences of Marmosa (Micoureus) demerarae, Marmosa (Micoureus) constantiae, and Marmosa (Micoureus) paraguayanus were amplified using universal d-loop primers and virtually no genetic differences were detected within and among species. These sequences matched the control region of the mitochondrial marsupial genome. Analyses of qualitative aspects of these sequences revealed that their structural composition is very similar to the d-loop region of other didelphid species. However, the total lack of variability has not been reported from other closely related species. The data analyzed here support the occurrence of highly conserved d-loop sequences, and we found no support for the hypothesis that these sequences are d-loop-like nuclear pseudogenes. Furthermore, the control and flanking regions obtained with different primers corroborate the lack of variability of the d-loop sequences in the mitochondrial genome of Marmosa (Micoureus).
George Rêgo Albuquerque - One of the best experts on this subject based on the ideXlab platform.
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Eimeria spp. (Apicomplexa: Eimeriidae) of marsupials (Mammalia: Didelphimorphia) in southern Bahia, Brazil
Revista brasileira de parasitologia veterinaria = Brazilian journal of veterinary parasitology : Orgao Oficial do Colegio Brasileiro de Parasitologia , 2018Co-Authors: Hllytchaikra Ferraz Fehlberg, Pedro De Alcântara Brito Junior, Martin R. Alvarez, Bruno Pereira Berto, George Rêgo AlbuquerqueAbstract:The occurrence of Eimeria Schneider, 1875 in mammals of the order Didelphimorphia indicates the infection-predisposition of these animals, which in turn is mainly determined for their eating habits. The objective of this work was to evaluate the parasitism of Eimeria spp. in marsupials of the Atlantic Forest of the southern region of Bahia. Fecal samples were collected from marsupials captured in the regions of Ilheus, Una, Belmonte and Mascote, with traps of the Sherman model (23 × 8 × 9 cm), Tomahawk (50 × 17 × 17 cm) and pitfall and analyzed by Sheather's modified centrifugal-flotation method. Oocysts were identified by microscopical evaluation of their morphology and morphometry. Didelphis aurita Wied-Neuwied, 1826, Gracilinanus agilis Burmeister, 1854, Monodelphis americana Muller, 1776, Marmosa demerarae O. Thomas, 1905 and Marmosa murina Linnaeus, 1758 were parasitized by Eimeria philanderi Lainson & Shaw, 1989 and Eimeria gambai Carini, 1938. Mixed parasitism for these two coccidia was observed in two of the 56 marsupials sampled. In conclusion, this work registers new hosts for E. philanderi and E. gambai, as well as the state of Bahia as a new distribution site for these coccidia.
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Eimeria spp. (Apicomplexa: Eimeriidae) of marsupials (Mammalia: Didelphimorphia) in southern Bahia, Brazil
2018Co-Authors: Hllytchaikra Ferraz Fehlberg, Bruno Pereira Berto, Pedro De Alcântara Brito, Martín Roberto Del Valle Alvarez, George Rêgo AlbuquerqueAbstract:Abstract The occurrence of Eimeria Schneider, 1875 in mammals of the order Didelphimorphia indicates the infection-predisposition of these animals, which in turn is mainly determined for their eating habits. The objective of this work was to evaluate the parasitism of Eimeria spp. in marsupials of the Atlantic Forest of the southern region of Bahia. Fecal samples were collected from marsupials captured in the regions of Ilhéus, Una, Belmonte and Mascote, with traps of the Sherman model (23 × 8 × 9 cm), Tomahawk (50 × 17 × 17 cm) and pitfall and analyzed by Sheather's modified centrifugal-flotation method. Oocysts were identified by microscopical evaluation of their morphology and morphometry. Didelphis aurita Wied-Neuwied, 1826, Gracilinanus agilis Burmeister, 1854, Monodelphis americana Müller, 1776, Marmosa demerarae O. Thomas, 1905 and Marmosa murina Linnaeus, 1758 were parasitized by Eimeria philanderi Lainson & Shaw, 1989 and Eimeria gambai Carini, 1938. Mixed parasitism for these two coccidia was observed in two of the 56 marsupials sampled. In conclusion, this work registers new hosts for E. philanderi and E. gambai, as well as the state of Bahia as a new distribution site for these coccidia.