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UKJNCC - Cgrandis2024 | Cladius grandis

Assessment ID
Cgrandis2024
Taxon name
Cladius grandis
Serville, 1823
Uploaded by
JNCC
Taxonomic information
Scientific name
Cladius grandis
Serville, 1823
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Insects
Kingdom
Animalia
Phylum
arthropoda
Class
insecta
Order
hymenoptera
Family
tenthredinidae
Genus
Cladius
Species
grandis
Species authority
Serville, 1823
National taxonomy system
UKSI
Unique national taxonomic ID
NHMSYS0020920103
Location and scope
Specific locality or subnational name or regional name
Great Britain
Scope (of the Assessment)
National
Countries included within the scope of the assessment
United Kingdom of Great Britain and Northern Ireland (the)
Country ISO code(s)
GB-SCT
GB-ENG
GB-WLS
Does the assessment cover a marine EEZ area(s)?
Not assigned
Conservation Status
Assessed as
Least Concern
Abbreviated status
LC
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
Assessments against all criteria give no reason to consider it threatened. The estimated rate of decline in range over the last 10 years does not exceed the 30% decline required for qualification as VU against Criterion A; EOO far exceeds the 20,000km2 VU threshold for Criterion B and the number of locations exceeds five, exceeding the Criterion D2 threshold. There is no information on population size to assess against Criteria C and D1 and no life history models to inform assessments against Criterion E. The AOO is below the Criterion B threshold but the number of recent locations exceeds 10 and there is no evidence of continuing decline, fragmentation or extreme fluctations in the population. None of the estimates approach the thresholds sufficiently to suggest NT might be an appropriate categorisation.
Assessment details
Year assessed
2024
Assessors/contributors/reviewers listed
Andy Musgrove
Criteria system used
IUCN
Reference for methods given
IUCN (2012) IUCN Red List Categories and Criteria. Version 3.1. 2nd Edition, IUCN Species Survival Commission. IUCN, Gland, Switzerland & Cambridge, UK plus regional guidelines v.20
URL (link) of redlist assessment or publication
https://www.sawflies.org.uk/wp-content/uploads/2024/05/Sawfly-Review-Phase-3-FINAL.pdf
Further information
Endemism (according to assessment)
Endemic to region
No
Population trends as listed in assessment
Population not undergoing continuing decline
Habitat and systems
Ecological system type
Terrestrial
Yes
Freshwater
No
Marine
No
Publication
A review of the status of the sawflies of Great Britain Phase 3: The Tenthredinidae (subfamily Nematinae)
Musgrove, A.J. 2024. A review of the status of sawflies of Great Britain - Phase 3: The Tenthredinidae (subfamily Nematinae). Natural England.