ammonites
Cystothalamia megacysta Finks 2010 (demosponge)

Demospongea - Agelasida - Guadalupiidae

Full reference: R. M. Finks. 2010. The sponge family Guadalupiidae in the Texas Permian. Journal of Paleontology 84(5):821-847

Belongs to Cystothalamia according to R. M. Finks 2010

Sister taxa: Cystothalamia adrianensis, Cystothalamia conica, Cystothalamia crassa, Cystothalamia distefanoi, Cystothalamia guadalupensis, Cystothalamia irregulara, Cystothalamia nana, Cystothalamia nodulifera, Cystothalamia surmaqensis

Type specimen: AMNH 44897

Ecology: stationary epifaunal suspension feeder