Order Mytilida Rafinesque 1815 (clam)
Alternative spelling: Mytiloida
Parent taxon: Mytilomorphi according to J. G. Carter et al. 2011
Sister taxon: Colpomyida
Subtaxa: Austromytilus, Breviorthonota, Coxesia, Fungiacara, Gibbomodiola, Isognomoidea, Leiosolenus, Lithodomina, Lunulacardioidea, Malleoidea, Megacrenella, Modiolopsoidea, Modiomytilus, Myapalmula, Mysidiella, Mysidielloidea, Mytiloidea, Mytilon, Mytilops, Notobotula, Paramusculus, Pernomytilus, Praemytilus, Protopis, Pseudocolpomya, Regoria, Regulifer, Rhomboidella, Rhynchomytilus, Semimodiola, Skarlatella, Sootryenella, Striamodiolus, Strimodiolus, Tommasina, Undatimusculus
Ecology: stationary low-level epifaunal suspension feeder