20 Onchidoris bilamellata

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20 Onchidoris bilamellata

Numerous observations suggest migrations for breeding or feeding, but the causes are difficult to verify. Whatever the impetus, mass movements with hundreds following in each other’s tracks occur and have been photographed.
Depth 28 metres. Temperature 12°C. Oban, Scotland. October 2010. © J. Anderson.

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Photographic guide to the identification and biology of European marine invertebrates

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