description Acaste Overview
Acaste is a genus of phacopid trilobites that lived from the Silurian into the Devonian Period. Fossils are known from European marine deposits. The genus is recognized by its large schizochroal eyes, whose visual surfaces contain numerous individually lensed facets, and by the characteristic proportions of its cephalon and thorax. Acaste is useful for identifying Silurian and Devonian phacopid assemblages and for comparing trilobite eye structure.
help Acaste FAQ
What is Acaste, and when did it live?
Acaste is a genus of phacopid trilobites that lived from the Silurian into the Devonian Period. Its fossils are known from European marine deposits.
What makes Acaste's eyes unusual?
The most distinctive feature is its large schizochroal eyes. Their visual surfaces contain numerous individually lensed facets, unlike a simple single-lens eye.
What does schizochroal mean in Acaste?
In a schizochroal eye, each facet is associated with its own lens and is set apart within the eye surface. Acaste is useful for studying this design because its large eyes preserve the feature clearly in many descriptions.
Where are Acaste fossils found?
Acaste fossils are chiefly associated with Europe. They occur in marine rocks spanning the Silurian and Devonian, not in freshwater deposits.
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