Essex Field Club on Facebook

Visit Our Centre

EFC Centre at Wat Tyler Country ParkOur centre is available for visits on a pre-booked basis on Wednesdays between 10am - 4pm. The Club’s activities and displays are also usually open to the public on the first Saturday of the month 11am - 4pm.

Video about the Club Essex Field Club video

About the Essex Field Club
Essex Field Club
registered charity
no 1113963
HLF Logo A-Z Page Index

Species Account for Merzomyia westermanni

previous species | next species

Merzomyia westermanni  (Meigen, 1826)
Diptera: other groups: Tephritidae

Merzomyia westermanni - a Copyright: Raymond Small

Maps produced by MapMate®. Data overlays Copyright © Essex Field Club 2024.
Reproduction for study and non-profit use permitted, all other rights reserved.

Taxonomic group: flies (other) (Diptera: other groups) - County data

Why not become a member

View time series maps for Merzomyia westermanni

Missing records?

member log-on for taxon report

Status: Notable

Essex RDB: Listed
Records: 132
First Record: 1976
Latest Record: 2023

1992-on hectads: 22
Pre-1992 hectads: 4
Total hectads: 24

Additional Phenology Data


Merzomyia westermanni - b
Merzomyia westermanni - b
Merzomyia westermanni - a
Merzomyia westermanni - a
Merzomyia westermanni
Merzomyia westermanni

upload a new image

Please report any problems with this record:
VC error
GR error
Taxon ID suspect
Structural habitat suspect
Other problems, please explain here:


Species text
The species is scarce, with nearly all Essex records in the south of the county. Nationally it has a strongly southeastern distribution with almost all records south of a line between the Wash and Severn map in Clemons (2004). It is a gallfly, whose larvae form a gall in the flower head of Ragwort Senecio, especially Hoary Ragwort S. erucifolius. Infected plants are usually obvious because the swelling forces up groups of pappus hairs. References

Species text last edited on Tue Mar 20th 2007 by user 3


Broad Habitat Data (based on 55 records with habitat information)

Broad subhabitat Data (based on 1 records with subhabitat information)

Structural Habitat Data (based on 59 records with structural habitat information)

Habitat Detail and Method (based on 132 records with habitat detail and method information)

Recorded management for locations with Merzomyia westermanni

Recorded substrate and hydrology for locations with Merzomyia westermanni

Why not join the Club, register and add a new species page
Interpretation of distribution maps