ammonites
Patellispongia attenuata Rigby and Chatterton 1999 (demosponge)

Demospongea - Orchocladina - Anthaspidellidae

Full reference: J. K. Rigby and B. D. E. Chatterton. 1999. Silurian (Wenlock) demosponges from the Avalanche Lake area of the Mackenzie Mountains, southwestern District of Mackenzie, Northwest Territories, Canada. Palaeontographica Canadiana 16:1-43

Belongs to Patellispongia according to J. K. Rigby and B. D. E. Chatterton 1999

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

Type specimen: Its type locality is Avalanche Lake, section AV1, 590m, which is in a Sheinwoodian offshore lime mudstone/wackestone in the Delorme Formation of Canada

Ecology: stationary epifaunal suspension feeder