ammonites
Patellispongia robusta Beresi and Rigby 1993 (demosponge)

Demospongea - Orchocladina - Anthaspidellidae

Full reference: M. S. Beresi and J. K. Rigby. 1993. The Lower Ordovician sponges of San Juan, Argentina. Brigham Young University Geology Studies 39:1-63

Belongs to Patellispongia according to M. S. Beresi and J. K. Rigby 1993

Sister taxa: Patellispongia alternata, Patellispongia argentina, Patellispongia attenuata, Patellispongia australis, Patellispongia brosiusae, Patellispongia mackenziensis, Patellispongia oculata, Patellispongia rugosa

Type specimen: Its type locality is Talacasto Gulch, which is in an Arenigian open shallow subtidal wackestone/lime mudstone in the San Juan Formation of Argentina

Ecology: stationary epifaunal suspension feeder