SCIENTIFIC PORTAL FOR ALL USERS INTERESTED IN PTEROBRANCHS AND GRAPTOLITES
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Collagen-like structures in Ordovician graptolite periderm
K.M.Towe & A. Urbanek
Nature 1972, 237, 5356, 443-445
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ABSTRACT:
---------Electron microscopic studies of skeletal periderm of
450 million year old graptolites (Hemichordata) reveal a
morphologically well-preserved fibrous material which
resembles collagen in association with polysaccharide. The
cortical fibrils, organized into lamellar plies, show a rough
periodicity, a central "core" and helical structure, all of
which can be related to extant collagens.
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---------To the right you can see a TEM micrograph showing
comparison of collagen fibrils in the sectioned sclera of the
rabbit eye (upper left), with cortical fibrils of sectioned
graptolite periderm.
Scale: 1 micrometer. From Towe & Urbanek.
Visit related pages:
Collagen in pterobranchs
Collagen in cuticula of Polychaeta
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