1. Trivia arctica with mantle partly retracted. Specimen has less dark pigment near mantle edges than usual, and yellow tubercles are prominent. May be features of not fully grown adults.
2. Trivia arctica with mantle partly retracted. Specimen has less dark pigment near mantle edges than usual, and yellow tubercles are prominent. May be features of not fully grown adults.

Trivia arctica with mantle partly retracted. Specimen has less dark pigment near mantle edges than usual, and yellow tubercles are prominent. May be features of not fully grown adults.