11 Testudinalia testudinalis. Length 11.6mm. Littoral. Moray Coast, Banffshire, Scotland. May 2017. Leg. S. Taylor.

11 Testudinalia testudinalis. Length 11.6mm. Littoral. Moray Coast, Banffshire, Scotland. May 2017. Leg. S. Taylor.

Brown and blackish brown marks on exterior radiate from the apex, bifurcating and reuniting to form a reticulated pattern that may merge to create a generally brown shell, as on this specimen.

APPENDIX re range advance/retreat: flic.kr/p/2jW74ig

marinvert.senckenberg.science/image-browse/