Trivia and Ascidian

Trivia and Ascidian

Observation - Trivia and Ascidian - UK and Ireland. Description: A Groatie Buckie (Trivia monacha) on its preferred food source - an Ascidian. Two sorts of Groatie,

A Groatie Buckie (Trivia monacha) on its preferred food source - an Ascidian.
Two sorts of Groatie, one without spots too.
I have found many shells on the North Sea coasts; this is my first from Scapa Flow and my first ever live one.
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Edit - Nov 2017, added Tag