Cambrian Era Peronopsis Trilobite Fossils 1.jpg

Peronopsis Trilobites

Wheeler Shale Formation, House Range, Millard Co., Utah, USA
Cambrian Era (510 Million Years Ago)
Peronopsis (meaning "broach-like" or possibly "boot-like") is a genus of trilobite restricted to the Middle Cambrian. Its remains have been found in Asia, Australia, Europe, and North America. Like all Agnostida, members of the Peronopsidae are diminutive, with the headshield (or cephalon) and tailshield (or pygidium) of approximately the same size (or isopygous) and outline. Like all Agnostina, Peronopsidae have only two thorax segments. The cephalon and pygidium usually have a complete set of furrows. The preglabellar furrow - between the front and the central raised area of the cephalon (or glabella) - is lacking or incomplete. The cephalon carries no spines. The border around the pygidium is not forked.
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Agnostida
Suborder: †Agnostina
Superfamily: †Agnostoidea
Family: †Peronopsidae
Genus: †Peronopsis