UKJNCC - Jcompressus2022 | Janus compressus

Assessment ID
Jcompressus2022
Taxon name
Janus compressus
Fabricius, 1793
Uploaded by
JNCC
Taxonomic information
Scientific name
Janus compressus
Fabricius, 1793
Common name(s)
Constricted Stem-sawfly
Assessed taxon level
Species
Higher level taxonomic groupings
Invertebrates
Insects
Kingdom
Animalia
Phylum
arthropoda
Class
insecta
Order
hymenoptera
Family
cephidae
Genus
Janus
Species
compressus
Species authority
Fabricius, 1793
National taxonomy system
UKSI
Unique national taxonomic ID
NHMSYS0021661111
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
Not Applicable
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
Andrew Halstead discovered the first British record in Surrey in 2011 (Halstead 2018), with further Surrey records in 2013 and 2021 by the same recorder. It is a fairly distinctive-looking insect and so it feels unlikely to be widely overlooked. All three records were from parks in close proximity to gardens. The species is known to feed on fruit-trees, suggesting likely importation through the horticultural trade; its native range includes central and southern Europe. Following Red List guidelines for a newly colonising species this species is given the status Not Applicable for now, although this will need review in future assessments.
Assessment details
Year assessed
2022
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.544
Further information
Endemism (according to assessment)
Endemic to region
Not assigned
Habitat and systems
Ecological system type
Terrestrial
Yes
Freshwater
No
Marine
No
Publication
Musgrove, A.J. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England.