A new Triassic sponge from the Antimonio terrane, Sonora, Mexico

A new Upper Triassic (Norian) chambered sponge, Fanthalamia glomerata n. sp., from the Antimonio Formation (Antimonio terrane) of northwestern Sonora, Mexico, is described. Recrystallized limestone containing the new sponge, together with other marine invertebrates, is interpreted to represent tropical, shallow-water carbonate settings characterized by local biostromal and biohermal buildups. The new species increases understanding of the ancient depositional environment and paleobiogeography of the Antimonio Formation.