†Moleculospina Rigby 1986 (demosponge)
Demospongea - Protomonaxonida - Piraniidae
Alternative spelling: Moleculopina
Parent taxon: Piraniidae according to R. M. Finks et al. 2004
Sister taxon: Pirania
Subtaxa: Moleculospina mammillata
Ecology: stationary intermediate-level epifaunal suspension feeder