单词	paedomorphosis
释义	paedomorphosis /ˌpiːdə(ʊ)ˈmɔːfəsɪs / /ˌpiːdə(ʊ)mɔːˈfəʊsɪs/ noun Zoology See neoteny.Facultative paedomorphosis occurs in most species, though individuals in these species usually metamorphose fully into terrestrial adults with robust bodies and limbs, broad heads, and laterally-flattened tails.... Germ layers, homology, larval evolution, larval origins of the vertebrates, paedomorphosis and heterochrony underpinned the origins of evolutionary embryology, and so I discuss each of these topics. By comparison to other squamates, this morphology indicates skeletal paedomorphosis that is common in secondarily marine reptiles. Derivatives paedomorphic adjective ... These extremely paedomorphic crinoids lacked arms, which conduct the feeding in normal crinoids. Amphiumas are elongate, paedomorphic, aquatic salamanders that superficially resemble the primitive sirens (Sirenidae). The orthaceans again have a fibrous secondary shell and are presumed to have arisen from some nisuisid stock, possibly by paedomorphic changes affecting pedicle development in particular.
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