Chernyshev, A.V. and Goedert, J.L. 2021.

New species of latest Eocene/earliest Oligocene microgastropods (Heterobranchia: Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA

. Zootaxa. 4981, 3 (Jun. 2021), 469–480. DOI:https://doi.org/10.11646/zootaxa.4981.3.3.