Sternaspis Otto, 1821

Type species.

Sternaspis thalassemoides Otto, 1821, by monotypy.

Diagnosis .

Sternaspids with introvert hooks falcate, tapered. Pre-shield region with 7 segments. Ventro-caudal shield stiff, usually with abundant sediment particles loosely adhered; with well-developed radial ribs and concentric lines. Branchial filaments arranged in discrete branchial plates.