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

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dc.contributor.authorElias, Hans, 1907-en_US
dc.contributor.authorBortner, Seymour.en_US
dc.date.accessioned2005-10-06T17:47:53Z
dc.date.available2005-10-06T17:47:53Z
dc.date.issued1957en_US
dc.description15 p. : ill. ; 24 cm.en_US
dc.descriptionIncludes 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.extent4115819 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/4703
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, N.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 1820en_US
dc.subject.lccQL1 .A436 no.1820, 1957en_US
dc.subject.lcshHair -- Phylogeny.en_US
dc.subject.lcshHair -- Evolution.en_US
dc.subject.lcshSkin -- Evolution.en_US
dc.subject.lcshMammals -- Anatomy.en_US
dc.subject.lcshAmniotes -- Anatomy.en_US
dc.titleOn the phylogeny of hair. American Museum novitates ; no. 1820en_US
dc.typetexten_US

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