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Assessment ID
220213505
Taxon name
Xerocrassa homeyeri
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa homeyeri
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
homeyeri
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Gómez-Moliner, B.J.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220271251
Taxon name
Xerocrassa grata
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa grata
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
grata
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Near Threatened
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2024
Assessors/contributors/reviewers listed
Martínez-Ortí, A.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220182003
Taxon name
Xerocrassa frater
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa frater
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
frater
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Gómez-Moliner, B.J.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220272687
Taxon name
Xerocrassa edmundi
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa edmundi
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
edmundi
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Endangered
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Martínez-Ortí, A.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220234778
Taxon name
Xerocrassa ebusitana
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa ebusitana
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
ebusitana
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Near Threatened
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Martínez-Ortí, A.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220252011
Taxon name
Xerocrassa derogata
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa derogata
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
derogata
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Martínez-Ortí, A.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
ESNRL7673820253
Taxon name
Xerocrassa cobosi
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa cobosi
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
cobosi
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Near Threatened
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2025
Assessors/contributors/reviewers listed
Arrébola Burgos, J.R.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp. and IUCN (2012) Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Spain assessment. The IUCN National Red List of Spanish Threatened Species
IUCN SSC EsSSG and IUCN Red List Unit, 2025. The IUCN National Red List of Spanish Threatened Species.
Assessment ID
220238139
Taxon name
Xerocrassa cisternasi
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa cisternasi
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
cisternasi
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Near Threatened
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Martínez-Ortí, A.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
164438291
Taxon name
Xerocrassa chiae
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa chiae
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
chiae
Species authority
Location and scope
Scope (of the Assessment)
Regional (multi-national)
Countries included within the scope of the assessment
Spain
Andorra
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Gómez-Moliner, B.J.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
No
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.
Assessment ID
220215551
Taxon name
Xerocrassa caroli
Uploaded by
IUCN SSC Spain Species Specialist Group (EsSSG)
Taxonomic information
Scientific name
Xerocrassa caroli
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Molluscs
Kingdom
Animalia
Phylum
Class
Order
Family
Genus
Xerocrassa
Species
caroli
Species authority
Location and scope
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Spain
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Criteria system used
IUCN

(see Assessment details)

Assessment details
Year assessed
2023
Assessors/contributors/reviewers listed
Gómez-Moliner, B.J.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, U.K. ii + 30pp.
Further information
Endemism (according to assessment)
Endemic to region
Yes
Habitat and systems
Ecological system type
Terrestrial
Freshwater
Marine
Publication
Global and Europe Assessment. The IUCN Red List of Threatened Species
IUCN. 2025. The IUCN Red List of Threatened Species. Version 2025-2. https://www.iucnredlist.org.