Trivia arctica
1: pitch-brown/black marks on mantle rim, dorsal when mantle fully extended.
2: no pitch-brown/black marks on shell.
Shell height (longest dimension) 8.5 mm. Menai Strait, Wales. March 2011.
Trivia arctica
1: pitch-brown/black marks on mantle rim, dorsal when mantle fully extended.
2: no pitch-brown/black marks on shell.
Shell height (longest dimension) 8.5 mm. Menai Strait, Wales. March 2011.