04 Littorina arcana N1168. Female removed from shell 5.7 mm high. N. Yorkshire, September 2014. Specimen N.

04 Littorina arcana N1168. Female removed from shell 5.7 mm high. N. Yorkshire, September 2014. Specimen N.

Most features seen through translucent mantle.
1: kidney. 2: rectum. 3: ctenidium (gill). 4: cephalic tentacle. 5: ovary. 6: developed pallial oviduct, not brood pouch with shelled embryos. 7: operculum.
Feature 6 is diagnostic for differentiation from L. saxatilis s.s.; see L. arcana N1177 05 Littorina arcana N1177. Pallial oviduct extracted from female with 5.7 mm high shell. N. Yorkshire, September 2014. Specimen N. for greater detail.

No full account yet of this species.
marinvert.senckenberg.science/image-browse/7215763361…