Trigonocercella

Trigonocercella is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period,^[1] a faunal stage which lasted from approximately 478 to 471 million years ago.^[1]

Trigonocercella Temporal range: Early Arenig
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	†Artiopoda
Class:	†Trilobita
Order:	†Asaphida
Family:	†Asaphidae
Genus:	†Trigonocercella Hintze, 1952
Species
T. acuta