Phylum Arthropoda, Class Trilobita

Devonian.  Silica Formation.  Trilobites comprise a complex and huge clade of arthropods with estimates of number of species exceeding 15,000. The Devonian was punctuated by periods of rising seas that disrupted the reef systems where the trilobites flourished, forcing selective adaptation.
Abstract/Description: Devonian. Silica Formation. Trilobites comprise a complex and huge clade of arthropods with estimates of number of species exceeding 15,000. The Devonian was punctuated by periods of rising seas that disrupted the reef systems where the trilobites flourished, forcing selective adaptation.
Subject(s): Wax, KY, United States
environmental sciences