†family Monophorasteridae Lahille 1896 (sand dollar)
Echinoidea - Clypeasteroida - Monophorasteridae
Full reference: F. Lahille. 1896. Variabilité et affinités du Monophora darwini. Revista del Museo de La Plata 7:411-444
Parent taxon: Scutelliformes according to A. Kroh and A. B. Smith 2010
Sister taxa: Abertellidae, Astriclypeidae, Dendrasteridae, Echinarachniidae, Eoscutellidae, Mellitidae, Placatenellidae, Protoscutellidae, Rotulidae, Scutasteridae, Scutellidae, Taiwanasteridae
Subtaxa: none
Type: Monophoraster
Ecology: slow-moving semi-infaunal detritivore
Distribution: