Title
On the phylogeny of hair
Related Titles
Series:
American Museum novitates, no. 1820
By
Elias, Hans, 1907-1985
Bortner, Seymour.
Type
Book
Material
Published material
Publication info
New York, N.Y, American Museum of Natural History, [1957]
Notes
Title from caption.
"March 29, 1957."
"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.
Subjects
59.14,78.1
,
Amniotes
,
Anatomy
,
Evolution
,
Hair
,
Mammals
,
Phylogeny
,
Skin
Call Number
QL1 .A436 no.1820, 1957
Language
English
Identifiers
OCLC:
31834367
Find in a local library
Download MODS