Eumastacidae Burr, 1898
Morsea californica Scudder, S.H., 1898
Morsea catalinae Rentz, D.C.F. & Weissman, 1981
Morsea dumicola Rehn, J.A.G. & Hebard, 1918
Morsea islandica Rentz, D.C.F. & Weissman, 1981
Morsea kaibabensis Rehn, J.A.G. & H.J. Grant Jr., 1958
Morsea piute Rehn, J.A.G. & H.J. Grant Jr., 1958
Morsea tamalpaisensis Rehn, J.A.G. & Hebard, 1909
