15 Haminoea navicula COMPARE Haminella solitaria

15 Haminoea navicula COMPARE Haminella solitaria

1: thin brown periostracum on live H. solitaria. 2: stranded white shell with periostracum lost. 3: Smooth spiral striae on shell; not slightly jagged/flexed. Aperture protrudes only slightly (4:) beyond umbilicus-like involute spire (5), but protrusion exaggerated because specimen tilted. Kattegat, Denmark, June 2022 and M. Kapeller, Skagerrak, Sweden.  © J.K. Prehn.