CAENOGASTROPODA COX, 1960

Powell, II, Charles L. & Dineen, Ashley A., 2023, A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska, PaleoBios 40 (1904), pp. 1-28 : 2

SUBCLASS CAENOGASTROPODA COX, 1960 COHORT SORBEOCONCHA PONDER AND LINDBERG,

1997 SUBCOHORT HYPSOGASTRPODA PONDER AND LINDBERG, 1997

ORDER LITTORINIMORPHA BANDEL, 2002

SUPERFAMILY NATICOIDEA GUILDING, 1834

FAMILY NATICIDAE GUILDING, 1834

SUBFAMILY POLINICINAE GRAY, 1847 A GENUS EUSPIRA AGASSIZ, 1837 (?)

Type species — Natica glaucinoides J. Sowerby, 1812 accepted as Euspira glaucinoides (J. Sowerby, 1812) by subsequent designation of Bucquoy, Dautzenberg, and Dolfuss (1833:143). Eocene, Europe (see Kabat, 1991: Bull MCZ 152:429 for more details).

Differential Diagnosis — This new species is questionably referred to the genus Euspira , which is characterized by a globose shell, spire moderately elevated, and an open umbilicus partially blocked by a weakly developed umbilical callus. While these features are found in Euspira ? louiemarincovichi it differs in having a higher spire than all but eastern Pacific and Arctic Euspira except E. pallida ( Broderip and Sowerby, 1829) and in having sculpture.

Geological Range — Late Jurassic ( Das et al. 2019) to Holocene.