02 Differentiation L. obtusata/L. fabalis

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02 Differentiation L. obtusata/L. fabalis

Littorina fabalis male. A large obvious penis, positioned at the posterior of the head on the right side, is present on mature males in all seasons, and can be exposed on dead or living specimens of both species.
Shell height 12.5mm. Llŷn, North Wales. September 2015.

Imprint

Photographic guide to the identification and biology of European marine invertebrates

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