16 results found
    1. Ecology

    Extinction risk and conservation of the world’s sharks and rays

    Nicholas K Dulvy et al.
    One-quarter of the Chondrichthyes have an elevated risk of extinction, mainly as a result of overfishing.
    1. Developmental Biology
    2. Evolutionary Biology

    Resegmentation is an ancestral feature of the gnathostome vertebral skeleton

    Katharine E Criswell, J Andrew Gillis
    Shared complexities of backbone segmentation between cartilaginous fishes and tetrapods originate much earlier in vertebrate evolution than previously thought.
    1. Ecology

    Extinction Risk: Counting the cost of overfishing on sharks and rays

    Darcy Bradley, Steven D Gaines
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    1. Neuroscience

    A primal role for the vestibular sense in the development of coordinated locomotion

    David E Ehrlich, David Schoppik
    Zebrafish use their sense of gravity and their cerebellum to coordinate the fin and body movements that, as they develop, allow them to better maintain balance as they climb.
    1. Developmental Biology
    2. Evolutionary Biology

    Evolution of the head-trunk interface in tetrapod vertebrates

    Elizabeth M Sefton et al.
    Both gill musculature and the evolutionarily conserved cucullaris muscle are derived from unsegmented mesoderm adjacent to the first 3 somites, extending the posterior limit of cranial mesoderm.
    1. Developmental Biology
    2. Stem Cells and Regenerative Medicine

    Adult chondrogenesis and spontaneous cartilage repair in the skate, Leucoraja erinacea

    Aleksandra Marconi et al.
    The ability of cartilaginous fishes to generate new cartilage through adulthood, and to spontaneously repair damaged cartilage, could shed light on novel cell-based therapies for cartilage injury in mammals.
    1. Evolutionary Biology

    Neurocranial anatomy of an enigmatic Early Devonian fish sheds light on early osteichthyan evolution

    Alice M Clement et al.
    Stunning new scan data of an enigmatic fish from the Early Devonian of Australia, Ligulalepis, is identified as a stem osteichthyan, specifically, as the sister taxon to the 'psarolepids' plus crown osteichthyans.
    1. Developmental Biology
    2. Evolutionary Biology

    A shift in anterior–posterior positional information underlies the fin-to-limb evolution

    Koh Onimaru et al.
    A shift in antero-posterior positional information may contribute to the fin-to-limb transformation.
    1. Developmental Biology
    2. Evolutionary Biology

    Fgf-signaling is compartmentalized within the mesenchyme and controls proliferation during salamander limb development

    Sruthi Purushothaman et al.
    While movement of Fgf-signaling to the limb mesenchyme accompanied a shift in function, the ultimate outcome remains a convergent tetrapod limb phenotype.
    1. Evolutionary Biology

    A non-archaeopterygid avialan theropod from the Late Jurassic of southern Germany

    Oliver WM Rauhut et al.
    A new taxon from the Late Jurassic of southern Germany represents the second volant bird known from that time period and documents the improvement of flapping flight in bird evolution.

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