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7 results for “2D morphometrics”
Figure 2. 2D in The Woodcock's head: Resolving a morphological oddity using geometric morphometrics
Figure 2. 2D landmarks used in this study following Klingenberg and Marugán-Lobón (2013). Skull scheme modified from Thompson (1942). Abbreviation: BK—beak; O—orbit; B—braincase.
Reshaping Foramen Magnum Research. Analyzing foramen magnum variation in modern humans using 2D osteometry and 3D geometric morphometrics – A master thesis summary and research review. Supplementary Materials.
<p>This supplementary materials document refers to: <em>Göldner, D., 2024. Reshaping Foramen Magnum Research. Analyzing foramen magnum variation in modern humans using 2D osteometry and 3D geometric morphometrics – A master thesis summary and research review. Mitteilungen der Berliner Gesellschaft für Anthropologie, Ethnologie und Urgeschichte 44 (2023).</em></p> <p> </p> <p> </p>
Using 2D dental geometric morphometrics to identify modern Perognathus and Chaetodipus specimens (Rodentia, Heteromyidae)
<p></p><p>The Heteromyidae (pocket mice and kangaroo rats) are a group of extant small rodents abundant in western North America, as well as in fossil assemblages over the last 20 million years. Two genera of heteromyids, Chaetodipus and Perognathus, share similar tooth morphology and teeth are the primary fossil remains. Previous genetic studies show these extant sister genera likely diverged in the middle Miocene (~16 million years ago); however, the Chaetodipus fossil record starts in the Pleistocene (~2 million years ago). In this study, we asked whether two-dimensional geometric morphometrics on complete dentition and isolated premolars can accurately identify Chaetodipus and Perognathus specimens at the genus and species level. We landmarked the occlusal surface of the upper and lower tooth rows of modern Chaetodipus (n = 83) and Perognathus specimens (n = 80), including 12 of the 26 extant species across the two genera. We ran a canonical variates analysis to investigate whether principal component variation could predict known taxonomic identifications. The morphospace using complete dentition can identify specimens to genus with 90 – 92% accuracy and to species with more variable accuracy. We found an isolated premolar provides sufficient information for genus-level identification (69 – 84% accuracy), but not for species-level identification (26 – 56% accuracy). This morphospace of modern specimens can be used to identify the skeletal remains of Chaetodipus and Perognathus in museum collections, raptor pellets, or middens, to refine our existing knowledge of heteromyid evolutionary history.</p><p></p>
Data from: 2D or Not 2D? Testing the utility of 2D vs. 3D landmark data in geometric morphometrics of the sculpin subfamily Oligocottinae (Pisces; Cottoidea)
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Using 2D dental geometric morphometrics to identify modern Perognathus and Chaetodipus specimens (Rodentia, Heteromyidae)
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Data from: Cryptic species or inadequate taxonomy? implementation of 2D geometric morphometrics based on integumental organs as landmarks for delimitation and description of copepod taxa
Discovery of cryptic species using molecular tools has become common in many animal groups but it is rarely accompanied by morphological revision, creating ongoing problems in taxonomy and conservation. In copepods, cryptic species have been discovered in most groups where fast-evolving molecular markers were employed. In this study at Yeelirrie in Western Australia we investigate a subterranean species complex belonging to the harpacticoid genus Schizopera Sars, 1905, using both the barcoding mitochondrial COI gene and landmark-based two-dimensional geometric morphometrics. Integumental organs (sensilla and pores) are used as landmarks for the first time in any crustacean group. Complete congruence between DNA-based species delimitation and relative position of integumental organs in two independent morphological structures suggests the existence of three distinct evolutionary units. We describe two of them as new species, employing a condensed taxonomic format appropriate for cryptic species. We argue that many supposedly cryptic species might not be cryptic if researchers focus on analyzing morphological structures with multivariate tools that explicitly take into account geometry of the phenotype. A perceived supremacy of molecular methods in detecting cryptic species is in our view a consequence of disparity of investment and unexploited recent advancements in morphometrics among taxonomists. Our study shows that morphometric data alone could be used to find diagnostic morphological traits and gives hope to anyone studying small animals with a hard integument or shell, especially opening the door to assessing fossil diversity and rich museum collections. We expect that simultaneous use of molecular tools with geometry-oriented morphometrics may yield faster formal description of species. Decrypted species in this study are a good example for urgency of formal descriptions, as they display short-range endemism in small groundwater calcrete aquifers in a paleochannel, where their conservation may be threatened by proposed mining.
Data from: Cryptic species or inadequate taxonomy? implementation of 2D geometric morphometrics based on integumental organs as landmarks for delimitation and description of copepod taxa
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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.