The National Red List Project

UKJNCC - Tschaefferi2023 | Tenthredo schaefferi

Assessment ID
Tschaefferi2023
Taxon name
Tenthredo schaefferi
Klug, 1817
Uploaded by
JNCC
Taxonomic information
Scientific name
Tenthredo schaefferi
Klug, 1817
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Insects
Kingdom
Animalia
Phylum
arthropoda
Class
insecta
Order
hymenoptera
Family
tenthredinidae
Genus
Tenthredo
Species
schaefferi
Species authority
Klug, 1817
National taxonomy system
UKSI
Unique national taxonomic ID
NBNSYS0000013486
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
Vulnerable
Abbreviated status
VU
Qualifying criteria (if given)
A2c
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
Benson (1952) considered this to be a very scarce species, occurring north to Lincolnshire. It has subsequently been found widely as far north as Dundee, and west to Devon and Anglesey, suggesting that a significant range expansion occurred. However, the data now support a status of Vulnerable, based on an estimated reduction of 48% of the AOO between 2012 and 2022, the causes of which are not understood. The assessment end-year was moved forward to 2022 as a record in this year made a difference to the IUCN status (consistent with the overall assessment approach).
Assessment details
Year assessed
2023
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.433
URL (link) of redlist assessment or publication
https://www.sawflies.org.uk/wp-content/uploads/2023/08/Sawfly-Review-Phase-2-FINAL.pdf
Further information
Endemism (according to assessment)
Endemic to region
Not assigned
Population trends as listed in assessment
Population 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 2: The Athaliidae and the Tenthredinidae (excluding Nematinae)
Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England.