DESCRIBER van Valen, 1978
TIME Cretaceous Late
FOSSILSITE Ravenscrag Formation, Saskatchewan, Canada
A mention of this genus from the Maastrichtian of West North America is contained in the fauna table of Averianov & Archibald 2003, (p.18). No further details are given.
Mimatuta morgoth Remains of this species have been identified from the Hell Creek Formation, which is Upper Cretaceous. However, there has been some reworking of fossils.