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Science. 1973 Mar 9;179(4077):1007-9.

Trilobite Eyes: Calcified Lenses in vivo.

Abstract

The corneal lenses preserved in the eyes of some of the Paleozoic trilobites (Arthropoda) are constructed of calcite that is crystallographically oriented to behave like glass. The calcareous lenses are capable of forming inverted images over a large depth of field and must have been present in the living trilobites.

PMID:
17842167
DOI:
10.1126/science.179.4077.1007
[PubMed]
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