Sea slug, Hydatina physis, Another primitive sea-slug, we can see in this species how the body is becoming more prominent than the shell. This represents a stage in the process by which 'snails' have evolved into 'slugs'. This common tropical species feeds on polychaete worms (30mm).

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Photo credit: © Solvin Zankl / Alamy / Afripics
License: Licensed
Model Released: No

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