Trivia juveniles.
Maximum length when live 13mm (excluding protruding foot and tentacles).
1: mantle lobes not fused; often withdrawn to expose juvenile white shell.
2: If mantle lobes fully expanded, a dorsal break line is present .
3: dorsal surface of mantle lobes often with stalk-like papillae that may branch terminally.
4: mantle lobes dorsally whitish or pale yellowish; developing dark bands and/or marks as Trivia matures.
5: live animal is spheroid with a respiratory siphon.juveniles.

Dorset, October 2014, © J. Chamberlain & the Lizard, Cornwall, England, August 2011, © N.Ward