ammonites
Cystothalamiella polyducta Rigby et al. 1988 (demosponge)

Demospongea - Agelasida - Aphrosalpingidae

Full reference: J. K. Rigby, A. W. Potter, and R. B. Blodgett. 1988. Ordovician sphinctozoan sponges of Alaska and Yukon Territory. Journal of Paleontology 62(5):731-746

Belongs to Cystothalamiella according to J. K. Rigby et al. 1988

Sister taxa: Cystothalamiella alaskaensis, Cystothalamiella craticulata, Cystothalamiella ducta, Cystothalamiella irregularis, Cystothalamiella tuboides

Type specimen: USNM 417214

Ecology: stationary epifaunal suspension feeder