†Cystothalamia guadalupensis Girty 1908 (demosponge)
Demospongea - Agelasida - Guadalupiidae
Alternative combination: Amblysiphonella guadalupensis
Full reference: G. H. Girty. 1908. The Guadalupian fauna. United States Geological Survey Professional Paper 58:1-651
Belongs to Cystothalamia according to J. K. Rigby et al. 1998
Sister taxa: Cystothalamia adrianensis, Cystothalamia conica, Cystothalamia crassa, Cystothalamia distefanoi, Cystothalamia irregulara, Cystothalamia megacysta, Cystothalamia nana, Cystothalamia nodulifera, Cystothalamia surmaqensis
Type specimen: Its type locality is USGS 2966 green, El Capitan, Guadalupe Mountains, which is in a Capitanian reef, buildup or bioherm limestone in the Capitan Formation of Texas
Ecology: stationary epifaunal suspension feeder