Length 26 mm. Disarticulated valves; ii & iii fractured in life, fell apart when girdle and muscle removed. Llŷn, North Wales. March 2016.
Dorsal view of eight disarticulated valves.
Valve i covers head .
Tail valve viii very small relative to other valves, pigmented tegmentum forms approximate inequilateral hexagon with curved corners.

White areas on intermediate valves ii to viii are parts of articulamentum forming large rounded apophyses on anterior edge which extend in life under next valve forwards, and two lateral insertion plates, separated by single slit (s), that insert into girdle.
1: anterior white insertion plates on head valve i (magnified and tilted up at anterior), typically split into six plates by five slits (s), but only two slits clearly developed on this specimen.
2: posterior white insertion plates on tail valve viii (magnified and tilted up at posterior), typically split into three plates by two slits (s), weakly developed on this specimen.

KEY ID FEATURES and similar species at: 01 Acanthochitona crinita