About Earthynature of Britain
  1. Home
  2. Species
  3. Alderfly
Species · Other insects

Alderfly

Sialis lutaria

767Records since 2000
MayPeak month
58Counties with records

When it is recorded

Jan6
Feb0
Mar65
Apr131
May154
Jun52
Jul60
Aug43
Sep112
Oct62
Nov33
Dec1

GBIF records by month, 2000–2025 (all years combined).

Where it is recorded

#CountyNationRecordsShare
1Powys Wales61
2Gwynedd Wales48
3Norfolk England40
4Ceredigion Wales40
5Worcestershire England35
6Highland Scotland32
7Isle of Anglesey Wales28
8Cambridgeshire England26
9Pembrokeshire Wales23
10City of Edinburgh Scotland20
11Conwy Wales20
12Surrey England19
13Monmouthshire Wales18
14Denbighshire Wales17
15Aberdeenshire Scotland12
267 England121 Scotland311 Wales5 Northern Ireland

Records per county (GADM level 2) and per nation; one record can count towards several areas. 58 counties in all.

About this species

Records since 2000
767
Peak month
May
Counties with records
58
Scientific name
Sialis lutaria
Group
Other insects
NBN Atlas records since 2000
668
Most recorded in
Powys
Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Megaloptera
Family
Sialidae
Genus
Sialis
Name with authority
Sialis lutaria (Linnaeus, 1758)
Described
1758
Contributing datasets
30

Sources: GBIF occurrence data (CC0 / CC BY), JNCC Taxon Designations (OGL), NBN Atlas (open licences), Wikidata (CC0) · Wikidata Q1316279 · GBIF 5101313