Oidalagnostus trispinifer

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

oid-, Greek, swelling; Agnostus, a trilobite genus name.

tri, three; spinifer, Latin, spined, referring to the three pygidial marginal spines.

Oidalagnostus trispiniger; Oidalagnostus cf. O. trispiniger; Oidalagnostus tienshanicus

Compared with Oidalagnostus changi, its glabella has a spine-like swelling medially on the anterior margin, a weak preglabellar median furrow, the cheek usually with dense radiating comb-like ornament, and the posterior axial ring of the pygidium each with two sausage-like lateral lobes, posterior margin with a median spine at the axial area.

This species is the type species of Oidalagnostus.