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5 results for “Scandentia”
Herbarium specimen image of Scandentia cymosa (Spreng.) E.L.Cabral & Bacigalupo, part of the collection of Royal Botanic Gardens, Kew
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.
Data from: Opsin genes of select treeshrews resolve ancestral character states within Scandentia
Treeshrews are small, squirrel-like mammals in the order Scandentia, which is nested together with Primates and Dermoptera in the superordinal group Euarchonta. They are often described as living fossils, and researchers have long turned to treeshrews as a model or ecological analogue for ancestral primates. A comparative study of colour vision-encoding genes within Scandentia found a derived amino acid substitution in the long-wavelength sensitive opsin gene (OPN1LW) of the Bornean smooth-tailed treeshrew (Dendrogale melanura). The opsin, by inference, is red-shifted by ca. 6 nm with an inferred peak sensitivity of 561 nm. It is tempting to view this trait as a novel visual adaptation; however, the genetic and functional diversity of visual pigments in treeshrews is unresolved outside of Borneo. Here we report gene sequences from the northern smooth-tailed treeshrew (Dendrogale murina) and the Mindanao treeshrew (Tupaia everetti, the senior synonym of Urogale everetti). We found that the opsin genes are under purifying selection and that D. murina shares the same substitution as its congener, a result that distinguishes Dendrogale from other treeshrews, including T. everetti. We discuss the implications of opsin functional variation in light of limited knowledge about the visual ecology of smooth-tailed treeshrews.
Data from: Opsin genes of select treeshrews resolve ancestral character states within Scandentia
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Data from: Using three-dimensional geometric morphometric and dental topographic analyses to infer the systematics and paleoecology of fossil treeshrews (Mammalia, Scandentia)
<p>Treeshrews are small, Indomalayan mammals closely related to primates. Previously, three-dimensional geometric morphometric analyses were used to assess patterns of treeshrew lower second molar morphology, which showed that the position of molar landmarks covaries with intraordinal systematics. Another analysis used dental topographic metrics to test patterns of functional dental morphology and found that molar curvature, complexity, and relief were an effective means for examining patterns of variation in treeshrew dietary ecology. Here, we build on these analyses by adding two fossil taxa; <i>Prodendrogale yunnanica</i>, from the Miocene of China and <i>Ptilocercus kylin</i> from the Oligocene of China. Our results show that <i>Pr. yunnanica</i> had a dental bauplan more like that of a tupaiid than that of a ptilocercid, but that the extant tupaiids, including <i>Tupaia</i> and <i>Dendrogale</i>, are more similar to one another in this regard than any are to <i>Prodendrogale. </i>This is contrary to our expectations as <i>Prodendrogale </i>is hypothesized to be most closely related to <i>Dendrogale. Ptilocercus kylin, </i>which has been proposed to be the sister taxon of <i>Pt. lowii,</i> is characterized by dental morphology like that of <i>Pt. lowii </i>in crest and cuspal position but is interpreted to have been more frugivorous. It has been claimed that <i>Ptilocercus </i>has undergone little morphological change through time. Our results suggest that <i>Pt. kylin</i> was more ecologically distinct from <i>Pt. lowii</i> than previously proposed, providing a glimpse into a more complex evolutionary history of that group than had been inferred.</p>
Data from: Using three-dimensional geometric morphometric and dental topographic analyses to infer the systematics and paleoecology of fossil treeshrews (Mammalia, Scandentia)
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