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IUCN Red List of selected molluscs and echinoderms in Great Britain 2025

Abstract

This report presents the first attempt to assess the extinction risk of selected marine molluscs and echinoderms in the coastal and offshore waters of Great Britain, applying the IUCN Red List Categories and Criteria at a regional scale. The assessment followed the standard three-step process: defining the region and taxa, assigning preliminary status using global criteria, and adjusting for potential interactions with populations outside the region. The final categorisation reflects the risk of extinction within Great Britain.

Species were drawn from the Marine Species of the British Isles and Adjacent Seas list, with families selected that were relatively well recorded. Non-native species, vagrants, and taxa with insufficient evidence were excluded. In total, 117 species were assessed, representing approximately 6% of molluscs and 4% of echinoderms known from British waters.

The accompanying spreadsheet provides the supporting data for the IUCN Red List of selected marine molluscs and echinoderms in Great Britain report. It offers a structured summary of assessment results and related information to complement the published report, including:

  • Final Red List category and qualifying criteria for assessed species.
  • Key metrics used in the assessment, such as extent of occurrence (EOO), area of occupancy (AOO), generation length, and presence in England, Scotland and Wales.
  • Notes on threats, population trends, and commentary supporting the categorisation.
  • A list of species that were not assessed, with reasons (e.g. non-native, vagrant, or insufficient data).
  • Additional evidence providing life history traits, habitat information, and other supporting details.

These resources may not be fully accessible for all users. If you need copies in a different or more accessible format, please contact Communications@jncc.gov.uk.

Resource type Publication

Topic category Environment

Reference date 2025·12·01

Citation
Tillin, H.M., Hawkins, S.J., Grundy, S. & Figueroa Ashforth, C. 2025. IUCN Red List of selected molluscs and echinoderms in Great Britain. JNCC Report 805. JNCC, Peterborough, ISSN 0963-8091.

Lineage
This report presents the first attempt to assess the extinction risk of selected marine molluscs and echinoderms in the coastal and offshore waters of Great Britain, applying the IUCN Red List Categories and Criteria at a regional scale.

Responsible organisation
Communications, JNCC publisher

Limitations on public access No limitations

Use constraints Available under the Open Government Licence 3.0

Metadata date 2026·01·07

Metadata point of contact
Communications, JNCC

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