Bivalvia - Protobranchia - Malletiidae
Full reference: R. D. Hoare, M. J., I.I.I. Heaney, and R. H. Mapes. 1989. Bivalves (Mollusca) from the Imo Formation (Mississippian, Chesterian) of North-Central Arkansas. Journal of Paleontology 63(5):582-603
Parent taxon: Malletiidae according to R. D. Hoare et al. 1989
Sister taxa: Anthraconeilo, Arisaigia, Australoneilo, Cadomia, Carinineilo, Concavoleda, Ctenodontella, Dysodonta, Ekstadia, Johnmartinia, Katadesmia, Koenenia, Lapteviella, Lophoconcha, Malletia, Metapalaeoneilo, Myoplusia, Neilo, Nuculites, Palaeoneilo, Perissonata, Phaenodesmia, Prosoleptus, Quadratonucula, Sluha, Taimyrodon, Tindariopsis, Vnigriella, Yoldioides, Zeehania
Subtaxa: Spathelopsis browni
Ecology: facultatively mobile infaunal deposit feeder