Bivalvia - Mytilida - Mytilidae

Alternative combinations: Myalina postcarbonica, Mytilus postcarbonica

Full reference: G. H. Girty. 1927. Descriptions of new species of Carboniferous and Triassic fossils (from southeastern Idaho). United States Geological Survey Professional Paper 152:411-446

Belongs to Mytilus according to M. E. Clapham 2011

Sister taxa: Mytilus (Crenomytilus), Mytilus (Falcimytilus), Mytilus (Mytilus), Mytilus (Tumidimytilus), Mytilus affinis, Mytilus antiqorum, Mytilus beaumonti, Mytilus brewsterensis, Mytilus bussoni, Mytilus californianus, Mytilus canoasensis, Mytilus cleopatrae, Mytilus conradinus, Mytilus deperditus, Mytilus edulis planulatus, Mytilus eurynota, Mytilus galloprovincialis, Mytilus hamiltonensis, Mytilus homfrayi, Mytilus jurensis, Mytilus lamellosus, Mytilus linguatulus, Mytilus luciferus, Mytilus mabuchii, Mytilus madagascariensis, Mytilus magellanicus, Mytilus mooraboolensis, Mytilus nativus, Mytilus ochotensis, Mytilus pectinatus, Mytilus periscus, Mytilus rimosus, Mytilus scaphoides, Mytilus seminummuarius, Mytilus shulapsensis, Mytilus submenkeanus, Mytilus subpectinatus, Mytilus trossulus, Mytilus ursensis

Average measurements (in mm): valve length 29.1