07 Rissoa parva. Shell height 2.5 mm. Menai Strait, Wales. August 2010.

07 Rissoa parva. Shell height 2.5 mm. Menai Strait, Wales. August 2010.

1: dark-brown, diagnostic, falciform (sickle-blade-shape a.k.a. ‘comma’) mark across labial varix.
2: white labial varix
3: groove (not always visible) between labial varix and edge of aperture.
4: Corallina; longitudinal fold in sole assists grip on algal strands.

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