04.1 Trivia monacha COMPARE with Trivia arctica

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04.1 Trivia monacha COMPARE with Trivia arctica

Shell heights both 11.2 mm. Where ribs from both sides meet, they are:
On T. monacha (1) unaligned, (2) often of different width or (3) joined at an angle.
On T. arctica, ribs are perfectly aligned and their junction point is imperceptible, except where deflected by an interposed subsidiary rib (4).

Imprint

Photographic guide to the identification and biology of European marine invertebrates

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