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Sphaerexochus

SPHAEREXOCHUS
The external skeleton of this trilobite is convex and elongate, with a thick, calcite cuticle. Its raised central lobe is especially convex, and the inflated glabella occupies the bulk of the head width. The genal spines are reduced. Its thorax has 11 segments, with tiny pleural tips, curved down- ward. The short tail shield is also spiny.
Habitat: Sphaerexochus probably lived in fairly shallow water, on and around coral reefs.
Remark: This genus is usually found in Late Ordovician and Silurian limestones.

© 1992 Cyril Walker, David Ward .