Research Library | Digital Repository

On the phylogeny of hair. American Museum novitates ; no. 1820

Show simple item record Elias, Hans, 1907- en_US Bortner, Seymour. en_US 2005-10-06T17:47:53Z 2005-10-06T17:47:53Z 1957 en_US
dc.description 15 p. : ill. ; 24 cm. en_US
dc.description Includes bibliographical references (p. 14-15). en_US
dc.description.abstract "Thickenings of the epidermis that project downward and upward, the outward projections of which are surrounded by circular ditches, and that perform a mechanico-sensory function are considered forerunners of hairs (prototriches). Findings of previous observers on such structures in fishes, tailed amphibians, and reptiles are combined with new observations on skin projections of some Salienta to devise a theory of hair and scale evolution. The most primitive prototriches are simple downward thickenings of the epidermis (fishes). In the next stage, a small corium papilla pushes into the epidermal downward thickening and a slight external elevation is added (tailed amphibians). Further phases involve keratinized, sharp, conical projections with circular ditches (coni circumfossati) in spadefoot toads. In some reptiles sensory bristles of similar structure present another phase. The prototriches in tailless amphibians are arranged in characteristic patterns on the warts. Transitional phases between protothrix-studded warts and scale-hair combinations can be shown. The theory is advanced that while the hairs derive from the prototriches, the scales of Amniota derive from warts of amphibians"--P. 14. en_US
dc.format.extent 4115819 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 1820 en_US
dc.subject.lcc QL1 .A436 no.1820, 1957 en_US
dc.subject.lcsh Hair -- Phylogeny. en_US
dc.subject.lcsh Hair -- Evolution. en_US
dc.subject.lcsh Skin -- Evolution. en_US
dc.subject.lcsh Mammals -- Anatomy. en_US
dc.subject.lcsh Amniotes -- Anatomy. en_US
dc.title On the phylogeny of hair. American Museum novitates ; no. 1820 en_US
dc.type text en_US

Files in this item

This item appears in the following Collection(s)

  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

Show simple item record

Search Entire Repository

Advanced Search


My Account