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Australia: The Land Where Time Began |
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Cosmine Found only in the Sarcoptergii, this is a primitive tissue that is believed to have had the function of supporting a complex sensory system on the surface of the dermal bones. It consisted of a layer of dentine above the dermal bone, containing flask-shaped cavities possibly containing sensory cells, connected to the outer surface by pores, connected by canals, and probably formed a complex vascular system for the skin . The dentine layer was covered by an enameloid layer and the epithelium. John A Long The Rise of Fishes - 500 Million years of Evolution, University of New South Wales Press, 1995 |
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Author: M.H.Monroe Email: admin@austhrutime.com Sources & Further reading |