T. tazagurtensis Tariccoia is a genus of nektaspid arthropods belonging to the family Liwiidae, known from fossils found in Ordovician strata in Sardinia and Morocco.

The dorsal exoskeleton consists of a cephalon, a pygidium and two or three thoracic somites with articulating half-rings, all non-calcified.

[1] T. arrusensis has been collected from the Upper Ordovician (Sandbian to Katian) Riu is Arrus Member, Monte Argentu Formation, Sardinia, Italy.

[1] T. tazagurtensis has been collected from the Fezouata Formation of Morocco dating to the Early Ordovician (Tremadocian).

[4] Tariccoia arrusensis is thought to have lived in a restricted reduced oxygen marine environment close to shore such as a lagoon or a bay in what was then the cold high-latitude margin of southern Gondwana, where it was locally abundant alongside macroscopic algae.