Trilobites de la Formación San Juan (Ordovícico Inferior), Precordillera Argentina

VACCARI, N.E.

AMEGHINIANA

Asociación Paleontológica Argentina

Lugar: Buenos Aires; Año: 2001 vol. 38 p. 331 - 347

0002-7014

Trilobites of the San Juan Formation (Lower Ordovician), Argentine Precordillera. New trilobite species from the San Juan Formation, on the west flank of the Cerro La Silla and Cerro Viejo, near Jáchal (San Juan Province), include late Tremadoc-early Arenig Leiostegium precordillearanus n. sp., early Arenig Platillaenus niquivilensis n. sp. and P. jaanussoni n. sp., and late Arenig-early Llanvirn Basilicus (Basiliella) leanzai n. sp., and Waisfeldaspis beatrizae n. gen. et n. sp. A new scutelluine trilobite, Waisfeldaspis n. gen., is proposed to include a rare species with a pygidium as wide as long, axis very short, and pleural fields with only two pairs of ribs.