17 Steromphala umbilicalis. H. 7.9mm, B. 12mm. Aug. 2013. Menai Strait, Wales.

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17 Steromphala umbilicalis. H. 7.9mm, B. 12mm. Aug. 2013. Menai Strait, Wales.

Translucent, black-purple freckled, sub-rectangular, smooth-edged, right neck-lobe; flattened while releasing faeces. Circular operculum resting on yellow epipodium. Sensory tentacle at base of right eye peduncle (none on left).

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Photographic guide to the identification and biology of European marine invertebrates

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