RataterraFirst edition in progress
My atlas

Searches names, synonyms and regional names, with or without accents.

    Sea, rivers & lakes

    Molluscs

    Shellfish with shells and without: oysters, mussels and clams, sea snails, squid, cuttlefish and octopus.

    Watercolour of oysters, mussels, whelk shells and a squid on an oyster farmer's table overlooking tidal water.

    Bivalves

    38

    Sea snails

    8

    Squid, cuttlefish and octopus

    5

    Habitats and classes follow the World Register of Marine Species (WoRMS), checked on 27 October 2026. A species recorded in both sea and fresh or brackish water appears in both lists.