†suborder Echinochimaeroidei (chimaera)
Chondrichthyes - Chimaeriformes
Parent taxon: Chimaeriformes according to J. S. Nelson et al. 2016
See also Long 2011 and Nelson 2006
Sister taxa: Arctacanthus, Callorhynchidae, Chimaeridae, Chimaeroidei, Chimeroidei, Crassidonta, Icthypriapus, Myracanthiodei, Myriacanthoidei, Squalorajoidei
Subtaxa: Echinochimaeridae
Ecology: nektobenthic carnivore
Distribution: found only at MV 7106, Supercrop Quarry, Bear Gulch (Carboniferous of Montana)