Demospongea - Agelasida - Guadalupiidae

Synonym: Racemina Termier and Termier 1977

Full reference: G. H. Girty. 1908. The Guadalupian fauna. United States Geological Survey Professional Paper 58:1-651

Parent taxon: Guadalupiidae according to R. M. Finks et al. 2004

Sister taxa: Diecithalamia, Exovasa, Guadalupia, Imbricatocoelia, Incisimura, Lemonea, Polyphymaspongia

Subtaxa: Cystothalamia adrianensis, Cystothalamia conica, Cystothalamia crassa, Cystothalamia distefanoi, Cystothalamia guadalupensis, Cystothalamia irregulara, Cystothalamia megacysta, Cystothalamia nana, Cystothalamia nodulifera, Cystothalamia surmaqensis

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Type: Cystothalamia nodulifera

Ecology: stationary epifaunal suspension feeder