Ellipsoscapha occidentalis (Meek & Hayden, 1856)

Cunha, Carlo M. & Salvador, Rodrigo B., 2018, Type specimens of fossil " Architectibranchia " and Cephalaspidea (Mollusca, Heterobranchia) in the Academy of Natural Sciences of Philadelphia, Zoosystematics and Evolution 94 (2), pp. 505-527 : 505

Ellipsoscapha occidentalis (Meek & Hayden, 1856) Figure 6N

Bulla occidentalis Meek & Hayden, 1856 (non A. Adams, 1850): 69.

Type locality.

Yellowstone River (150 miles above its mouth), near Glendive, Montana, USA; stratum: Pierre Shale; age: Late Cretaceous.

Type material.

Syntypes, ANSP IP17139, 2 shells.

Current taxonomic status.

Ellipsoscapha occidentalis (Meek & Hayden, 1856) ( Sohl 1967). Substitution of the junior primary homonym is not mandatory if the conditions of Article 23.9.5 ICZN (1999) are met, but a request for a ruling of the Commission under its plenary powers to validate the junior homonymous name would be necessary.