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288 results for “Sigmodontinae”
FIGURE 8 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 8. The occlusal view of the upper and lower molar rows of Nectomys saturatus paratype BMNH 3.1.8.3. The bar represents 2 mm.
FIGURE 7 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 7. The skull of Nectomys saturatus. Dorsal, ventral, and lateral views of the skull and lateral view of the mandible N. saturatus holotype BMNH 97.11.7.40. Courtesy of the Trustees of the Natural History Museum, London. The bar represents 10 mm.
FIGURE 3 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 3. Bar chart showing the frequency of the characters states of the six informative morphological traits. In the x axes are the species and in the y axes are the absolute frequency of characters states. Each chart (a–f) represents one character where the numbers represent the character states. A, size of mystacial vibrissae; 1, mystacial vibrissae reaches the base of the ear; 2, mystacial vibrissae surpass the base of the ear, but do not reach the top of pinnae; 3, mystacial vibrissae surpass the pinnae top. B, color of ungual tufts; 1, ungual tufts dark brown; 2, ungual tufts dark colored in the base and white in the top; 3, ungual tufts white. C, presence and size of hypothenar pad of pes; 1, hypothenar pad present, small and fleshy; 2, hypothenar pad of pes absent; 3, hypothenar pad of pes small, not fleshy. D, color of ventral keel of hair on ventral surface of the tail; 1, keel dark brown-haired; 2, keel white-haired; 3, keel white-haired at a half to two-thirds apical part of the tail; 4, keel white-haired at a quarter to one-third apical part of the tail; 5, keel entire mixed with dark brown and white hairs; 6, keel mixed with dark brown and white hairs at one-third apical part. E, shape of interorbital region; 1, interorbital region strongly convergent posteroanteriorly; 2, interorbital region with supraorbital margin tending to be parallel. F, presence of paralophule on M1; 1, paralophule absent; 2, paralophule present.
FIGURE 5 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 5. Upper molars. Occlusal view of upper molars showing the presence of paralophule at M1 of Nectomys saturatus (BMNH 3.1.8.3, arrow in the left panel), and the absence of this character in N. rattus (NMW B471, right panel). The bars represent 5 mm.
FIGURE 2 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 2. Scatter plot of the individual scores obtained from the first two discriminant functions of Discriminant Analysis: axis x, first discriminant function (DF1) represents 52.3% of variance; axis y, second discriminant function (DF2) represents 26.1% of variation.
FIGURE 1 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 1. Location of Nectomys specimens employed in this study. Countries acronyms: ARG, Argentina; BRA, Brazil; COL, Colombia; ECU, Ecuador; FGU, French Guiana; GUY, Guyana; PER, Peru; SUR, Suriname; TRI, Trinidad and Tobago; VEN, Venezuela.
FIGURE 4 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 4. Interorbital region. Dorsal view of the skull showing the different shapes of interorbital region. Upper panel, interorbital region strongly convergent, Nectomys apicalis (AMNH 71909). Lower panel, interorbital with supraorbital margins almost parallel sided, N. saturatus (BMNH 3.1.8.3). The bars represent 5 mm.
FIGURA 8 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 8: Histograma da distribuição dos valores da primeira função entre O. flavescens (em preto) e O. nigripes (em branco).
FIGURA 5 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 5: A) escápulas direitas em vista dorsal: em cima O. nigripes, embaixo O. flavescens; B) úmeros direitos em vista posterior de O. nigripes à esquerda e O. flavescens à direita. Setas estreitas na porção proximal evidenciam as diferenças no tubérculo do úmero mais conspícuo e protuberante em O. flavescens do que em O. nigripes. Setas mais largas mostram as diferenças na tuberosidade deltóide; C) detalhes da articulação do membro superior em O. flavescens. Na porção proximal a cabeça do úmero, medial, articula-se com o acrômio (a) da escápula e na porção distal a tróclea (t), medial, recebe a extremidade proximal da ulna e o capítulo (c), lateral, articula-se com a cabeça do rádio. fs = fossa supra-espinhal; fi = fossa infra-espinhal; e = espinha da escápula; tu = tubérculo do úmero; d = tuberosidade deltóidea; fo = fossa do olécrano.
FIGURA 4 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 4: Vista ventral do crânio de Oligoryzomys com detalhe da região da bula auditiva. A, B, C) ilustram diferentes conformações do espinho estapedial.
FIGURA 3 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 3: Em cima: vista dorsal, ventral e lateral de sincrânio de O. nigripes. Em baixo: vista dorsal, ventral e lateral de sincrânio de O. flavescens. Escala = 14 mm.
FIGURA 7 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 7: Corte no plano sagital de estômago de O. nigripes; D) duodeno; E) esôfago; I) incisura angular; EA) epitélio aglandular; EG) epitélio glandular; P) plica.
FIGURA 1 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 1: Localidades de origem dos exemplares de Oligoryzomys analisados. 1: Santa Vitória do Palmar; 2: Tapes; 3: Viamão; 4: Triunfo; 5: Porto Alegre; 6: Maquiné; 7: Torres; 8: Canela; 9: São Francisco de Paula; 10: Monte Negro; 11: Venâncio Aires; 12: Cruz Alta; 13: Santa Maria; 14: Rosário do Sul; 15: Aratiba; 16: Itá; 17: Esmeralda; 18: Cambará do Sul; 19: São Joaquim; 20: Iguape; 21: Juquiá; 22: Caxambú; 23: Cariacica; 24: Santa Teresa; 25: Santa Maria de Jetibá.
FIGURA 6 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 6: A) Vista lateral da metade esquerda do osso do quadril formado pelos três ossos primários: ílio, ísquio e púbis (P) de O. nigripes, à esquerda, e O. flavescens à direita: CI) crista íliaca, FA) fossa do acetábulo, FO) forame obturado; B) Fêmur esquerdo em vistas anterior (lado esquerdo) e posterior (lado direito). Na região proximal estão evidenciados a cabeça do fêmur (CF), trocânter maior (TM) e trocânter menor (Tm). Na região distal, vista anterior, destaque para a articulação com a patela (P) e na vista posterior os côndilos medial (CM) e lateral CL); C) Tíbia e fíbula esquerdas em vista posterior. ON = O. nigripes e OF = O. flavescens. A seta indica uma lâmina óssea oblonga mais proeminente em O. nigripes do que em O. flavescens. O número 1 indica uma projeção póstero-lateral inferior à face articular mais evidente em O. nigripes do que em O. flavescens. O número 2 indica um ápice pontiagudo, em O. nigripes, voltado inferiormente na face posterior que não aparece em O. flavescens. Na porção distal encontram-se o maléolo medial (MM) e o maléolo lateral (ML).
FIGURA 2 in Anatomia Comparada E Morfometria De Oligoryzomys Nigripes E O. Flavescens (Rodentia, Sigmodontinae) No Rio Grande Do Sul, Brasil
FIGURA 2: Variáveis morfométricas crânio dentárias averiguadas. Da esquerda para direita: vista lateral, dorsal, ventral do crânio e vista superior da série molar superior de Oligoryzomys: comprimento total (CT), comprimento côndilo-incisivo (CCI), comprimento côndilozigomática (CCZ), comprimento do diástema superior esquerdo (CDS), largura zigomática (LZ), largura do rostro (LR), comprimento do rostro (CR), largura da caixa craniana (CC), largura inter-orbital (LIO), largura do forâmen incisivo (LFI), comprimento do forâmen incisivo (CFI), largura da placa zigomática (LPZ), ponte palatal (PP), distância entre as bordas labiais do primeiro molar superior esquerdo e direito (DMI), comprimento póstero-palatal (CPP), largura da bula auditiva (LBA), distância entre os côndilos occiptais (DCO), largura do primeiro molar superior (LMI) e comprimento da série molar superior (CMS).
FIGURE 5 in Ontogenetic And Sexual Variation In Cranial Characters Of Aegialomys Xanthaeolus (Thomas, 1894) (Cricetidae: Sigmodontinae) From Ecuador And Peru
FIGURE 5: Scores of principal component analysis based on the values of 19 variables and designed in the first and second principal component, showing sexual differentiation.
FIGURE 4 in Ontogenetic And Sexual Variation In Cranial Characters Of Aegialomys Xanthaeolus (Thomas, 1894) (Cricetidae: Sigmodontinae) From Ecuador And Peru
FIGURE 4: Scores of principal component analysis based on the values of 19 variables and designed in the first and second principal component, showing differentiation among age classes.
FIGURE 6 in Ontogenetic And Sexual Variation In Cranial Characters Of Aegialomys Xanthaeolus (Thomas, 1894) (Cricetidae: Sigmodontinae) From Ecuador And Peru
FIGURE 6: Scores based on the values of the first nine principal components and designed in the first and second canonical discriminant function.
FIGURE 1 in Ontogenetic And Sexual Variation In Cranial Characters Of Aegialomys Xanthaeolus (Thomas, 1894) (Cricetidae: Sigmodontinae) From Ecuador And Peru
FIGURE 1: Known collection localities of Aegialomys xanthaeolus in South America. The area delimited by a square is detailed in Figure 2. See gazetteer (Appendix B), where numbers are associated with collection localitites.
Table 4 in Taxonomy, phylogeny, and diversity of the extinct Lesser Antillean rice rats (Sigmodontinae: Oryzomyini), with description of a new genus and species
<p><b>Table 4.</b> Last-occurrence dates for extinct rice rats from the Windward and Leeward Islands, based on historical records or calibrated radiometric dates from archaeological or palaeontological horizons containing rice rat material</p><table><tbody><tr><th></th><th>Archaeological or palaeontological record</th></tr></tbody><tbody><tr><th>Species</th><td>Island</td><td>Historical record</td><td>Site</td><td>Calibrated radiometric date, 2s</td><td>Reference</td></tr><tr><th><i>Megalomys audreyae</i></th><td>Barbuda</td><td></td><td>Darby Sink</td><td>AD 1173–1385</td><td>MacPhee & Flemming (1999)</td></tr><tr><th><i>Megalomys desmarestii</i></th><td>Martinique</td><td><i>c.</i> 1897</td><td></td><td></td><td>Allen (1942)</td></tr><tr><th><i>Megalomys luciae</i></th><td>St. Lucia</td><td>pre-1881</td><td></td><td></td><td>Allen (1942)</td></tr><tr><th><i>Oligoryzomys victus</i></th><td>St. Vincent</td><td>1892</td><td></td><td></td><td>Allen (1942)</td></tr><tr><th><b><i>Pennatomys nivalis</i> gen. et</b> <b>sp. nov.</b></th><td>Nevis</td><td>1720? (1930s?)</td><td>Sulphur Ghaut</td><td>AD 900–1200</td><td>Newsom & Wing (2004); Wilson (2006)</td></tr><tr><td>St. Eustatius</td><td></td><td>Golden Rock</td><td>80 BC–AD 980</td><td>Schinkel (1992)</td></tr><tr><td>St. Kitts</td><td>1631?</td><td>Bloody Point</td><td>AD 660–1115</td><td>J.E. Robb, pers. comm.</td></tr><tr><th>Undescribed taxon</th><td>Anguilla</td><td></td><td>Shoal Bay East</td><td>AD 940–1320</td><td>Crock (2000)</td></tr><tr><th>Undescribed taxon (? <i>Megalomys</i> <i>audreyae</i> or ‘ <i>Ekbletomys</i> <i>hypenemus</i> ’)</th><td>Antigua</td><td></td><td>Indian Creek</td><td>AD 900–1100</td><td>Rouse & Morse (1999)</td></tr><tr><th>Undescribed taxon</th><td>Barbados</td><td>1848?</td><td></td><td></td><td>Schomburgk (1848), Ray (1962), Feilden (1890), Marsh (1984, 1985)</td></tr><tr><th>Undescribed taxon</th><td>Carriacou</td><td></td><td>Grand Bay</td><td>AD 390–1280</td><td>LeFebvre (2007); S.M. Fitzpatrick, pers. comm.</td></tr><tr><td>(Grenadines)</td><td></td><td></td><td></td></tr><tr><th>Undescribed taxon (large morph)</th><td>Grenada</td><td></td><td>Pearls</td><td>37 BC–AD 533</td><td>Haviser (1997)</td></tr><tr><th>Undescribed taxon (small morph)</th><td>Grenada</td><td></td><td>Pearls</td><td>37 BC–AD 533</td><td>Haviser (1997)</td></tr><tr><th>Undescribed taxon</th><td>Guadeloupe</td><td></td><td>Morel</td><td>AD 21–881</td><td>Haviser (1997)</td></tr><tr><th>Undescribed taxon</th><td>La Desirade</td><td></td><td>Petite Rivière</td><td>AD 600–1400</td><td>de Waal (1996)</td></tr><tr><th>Undescribed taxon</th><td>Marie Galante</td><td></td><td>Taliseronde</td><td>AD 350–665</td><td>Haviser (1997)</td></tr><tr><th>Undescribed taxon (large morph)</th><td>Montserrat</td><td></td><td>Trants</td><td>774 BC–AD 622</td><td>Petersen (1996)</td></tr><tr><th>Undescribed taxon (small morph)</th><td>Montserrat</td><td></td><td>Trants</td><td>774 BC–AD 622</td><td>Petersen (1996)</td></tr><tr><th>Undescribed taxon</th><td>Saba</td><td></td><td>Kelbey’s Ridge II</td><td>AD 1290–1400</td><td>Hoogland (1996)</td></tr><tr><th>Undescribed taxon</th><td>St. Martin</td><td></td><td>Hope Estate</td><td>AD 255–650</td><td>Newsom & Wing (2004)</td></tr></tbody></table><p>Calibrated dates were calculated from conventional <sup>14</sup> C ages (years BP) for <i>Megalomys audreyae</i> and for undescribed taxa from Grenada, Guadeloupe, and Marie Galante using OxCal 4.0 (Bronk Ramsey, 1995, 2001). The calibrated date for <i>M</i>. <i>audreyae</i> is based on a direct radiocarbon date from subfossil rice rat material; all other radiometric last-occurrence dates are based on calibrated dates of stratigraphically associated material from archaeological sites.</p>
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