How to Identify Nudibranchs & Sea Slugs
Practical tips for identifying nudibranchs and related sea slugs using body shape, colour, pattern, anatomy, food source, habitat and location.
Learn identificationSea Slug Species Database
Explore the verified MacroDivers collection of nudibranchs and other sea slugs.
Growing public collection
MacroDivers Sea Slug Database — Preview
Explore our growing collection of verified nudibranch and sea slug records, with photographs and practical identification details from the MacroDivers collection. New records will be added as the database develops.
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Identification Basics
Identification Basics
These guides explain the practical features we use when identifying sea slugs and organising records in the MacroDivers database.
Nudibranch & Sea Slug Body Types
Understand the practical body-shape categories used in the MacroDivers database, including oval, elongate, robust, with appendages, with visible shell and other.
Explore body typesRhinophores
A visual guide to rhinophore shapes, from ringed and smooth to rolled, branched and pocket-like forms.
Study rhinophoresNudibranch Gills
Understand external gill plumes, cerata, hidden gills and how these breathing structures help with identification.
Explore gill types