Tariccoia

Tariccoia is a genus of small to average size (between and long) marine arthropods in the Liwiidae Family, that lived during the late Ordovician period. Fossil remains of "Tariccoia" were collected from Sardinia, Italy. "Tariccoia" looks like a large, soft agnostid trilobite. It has a headshield (or cephalon) wider than the tailshield (pygidium), and in between them three (or four?) thoracic body segments (somites). The genus is monotypic, its sole species being Tariccoia arrusensis.
Etymology.
The name of the genus references the Sardinian paleontologist M. Taricco. The species was named after the Riu is Arrus Member, the deposit in which it was found.
Description.
"Tariccoia arrusensis" is between 2.5 and 6 cm along the axis, almost half a wide as long. The dorsal exoskeleton consists of a cephalon, a pygidium and two or three thoracic somites with articulating half-rings, all non-calcified. The cephalon is sub-semicircular, widest near the rounded genal angles. The cephalon is wider than the pygidium. Eyes are absent. Antennas are not known. The body is constricted at the two or three thoracic somites, so the animal gives the impression to have a waist. The pygidium is widest before midlength. The pygidium has a mid-ridge.
Distribution.
"T. arrusensis" has been collected from the Upper Ordovician (Sandbian to Katian) Riu is Arrus Member, Monte Argentu Formation, Sardinia, Italy.
Habitat.
"Tariccoia arrusensis" was probably a marine bottom dweller.