Mammalia - Cetacea - Balaenopteridae

Alternative combination: Plesiocetopsis occidentalis

Full reference: R. Kellogg. 1925. Fossil cetotheres from California. Contributions to Palaeontology from the Carnegie Institution of Washington 348(2):35-56

Belongs to Plesiocetus according to R. Kellogg 1925

Sister taxa: Balaenoptera (Plesiocetus) cortesii, Plesiocetus dubius, Plesiocetus dyticus, Plesiocetus gervaisii, Plesiocetus hupschii, Plesiocetus minor

Type specimen: UCMP M1351, a skull

Ecology: aquatic suspension feeder