14 Testudinalia testudinalis. Length 13.2mm. Littoral. Moray Coast, Banffshire, Scotland. May 2017. Leg. S. Taylor.

14 Testudinalia testudinalis. Length 13.2mm. Littoral. Moray Coast, Banffshire, Scotland. May 2017. Leg. S. Taylor.

Left; live in water soon after capture. Coated with thin layer of yellow-brown alga that affects colour.
Centre; recently dead, in water, after other specimens in captivity had grazed off algal coating.
Right; dead and dry. Colours duller but growth lines distinct.

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

marinvert.senckenberg.science/image-browse/