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355 results for “mammal species”
Data from: Species discrimination of co-occurring small fossil mammals: a case study of the Cretaceous-Paleogene multituberculate genus Mesodma
The mammalian fossil record is largely composed of isolated teeth and tooth-bearing elements. In vertebrate microfossil assemblages with closely related, co-occurring species of mammals, it can be difficult to identify isolated teeth to species level because morphological differences among species may be slight and based on a single tooth position. Here we investigate the utility of the allegedly diagnostic lower fourth premolar (p4) for species-level identification in the genus Mesodma (Multituberculata, Neoplagiaulacidae). We conducted linear and geometric morphometrics on 86 p4s representing four Cretaceous-Paleogene (K-Pg) species of Mesodma that are common in deposits of the western interior of North America. Although Mesodma has been extensively discussed in the literature, these four species overlap considerably in p4 size and shape, making species-level identifications challenging. Using linear measurements, landmarks, and semilandmarks, we quantified p4 size and shape to understand morphological variation across the genus and uncover practical sources of morphological differentiation among the species represented here. Our results indicate (1) size is more important than shape for identifying p4s of Mesodma species; p4 shape varies across the genus, but cannot be used alone to identify isolated p4s to species; (2) M. garfieldensis and M. thompsoni cannot be distinguished from each other using p4 size or shape; we therefore subsume M. garfieldensis within M. thompsoni; and (3) M. formosa increased in size across the K-Pg boundary. In light of these results, we recommend that taxonomic diagnoses relying on isolated teeth incorporate quantitative analyses of morphology whenever possible to increase the accuracy of species-level identifications and paleofaunal studies that employ them.
FIGURE 1. African mammal species described between January 1 1989 and December 31 2008 in A synthesis of African and western Indian Ocean Island mammal taxa (Class: Mammalia) described between 1988 and 2008: an update to Allen (1939) and Ansell (1989)
FIGURE 1. African mammal species described between January 1 1989 and December 31 2008, per year. The spike in 2006 is due largely to Louis et al. (2006b).
FIGURE 19 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 19. Dorsal, ventral and lateral views of skull and mandible of Thrichomys sp. (male, UFES 1407).
FIGURE 15 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 15. Detailed views of incisive foramen (left), mesopterigoyd fossa (middle) and subsquamosal foramen (right) of Rhipidomys ipukensis n. sp. (a: MN 73741) and Rhipidomys emiliae (b: DPO 10).
FIGURE 9 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 9. Dorsal, ventral and lateral views of skull and mandible of: a) Oecomys paricola (female, UFES 1368), b) Oecomys roberti (female, UFES 1370) and c) Oecomys sp. (female, UFES 1353).
FIGURE 12 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 12. Dorsal, ventral and lateral views of skull and mandible of Pseudoryzomys simplex (female, UFES 1381).
FIGURE 2 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 2. Landscape at the study area: a) Coco River at Parque Estadual do Cantão; b) interior view of the alluvial forest at Parque Estadual do Cantão; c) ipuca surrounded by a cultivated area at Fazenda Lago Verde.
FIGURE 6 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 6. Dorsal, ventral and lateral views of skull and mandible of Hylaeamys megacephalus (female, UFES 1327).
FIGURE 4 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 4. Dorsal, ventral and lateral views of skull and mandible of Calomys tocantinsi (male, UFES 1285).
FIGURE 1 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 1. Map of study area detailing locations of sampling points (circles with numbers or letters) at Parque Estadual do Cantão (PEC, blue box), Área de Proteção Ambiental Ilha do Bananal/Cantão (APABC), and Fazenda Lago Verde (FLV, yellow box), state of Tocantins, and Fazenda Santa Fé (FSF, blue box), state of Pará. See text for further information regarding sampling points.
FIGURE 18 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 18. Bayesian tree of cyt-b haplotypes from specimens of Thrichomys, rooted using Trinomys and Makalata. Bayesian posterior probabilities are in bold and percentages are average Kimura two-parameter distances.
FIGURE 14 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 14. Dorsal, ventral and lateral views of skull and mandible of the holotype of Rhipidomys ipukensis n. sp. (male, MN 73741).
FIGURE 17 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 17. Dorsal, ventral and lateral views of skull and mandible of Proechimys roberti (female, UFES 1396).
FIGURE 13 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 13. Bayesian tree of cyt-b haplotypes from specimens of Rhipidomys, rooted using Thomasomys and Hylaeamys. Bayesian posterior probabilities are in bold and percentages are average Kimura two-parameter distances.
FIGURE 11 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 11. Dorsal, ventral and lateral views of skull and mandible of Oligoryzomys fornesi (female, UFES 1376).
FIGURE 16 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 16. Dorsal, ventral and lateral views of skull and mandible of Makalata didelphoides (male, UFES1387).
FIGURE 5 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 5. Dorsal, ventral and lateral views of skull and mandible of Holochilus sciureus (male, UFES 1306).
FIGURE 3 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 3. Plot of cumulative number of species of small mammals captured at the mid-Araguaia River, Tocantins, Brazil.
FIGURE 10 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 10. Bayesian tree of cyt-b haplotypes from specimens of Oligoryzomys rooted using Hylaeamys and Thomasomys. Bayesian posterior probabilities are in bold and percentages are average Kimura two-parameter distances.
FIGURE 8 in Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat
FIGURE 8. Bayesian tree of cyt-b haplotypes from specimens of Oecomys rooted using Hylaeamys and Thomasomys. Bayesian posterior probabilities are in bold and percentages are average Kimura two-parameter distances.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.