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Species Account for Merzomyia westermanni

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

Merzomyia westermanni

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

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View time series maps for Merzomyia westermanni

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Essex RDB: Listed

Records: 124
First Record: 1976
Latest Record: 2020

1992-on hectads: 20
Pre-1992 hectads: 4
Total hectads: 22
Additional Phenology Data


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

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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 58 records with structural habitat information)

Habitat Detail and Method (based on 124 records with habitat detail and method information)

Recorded management for locations with Merzomyia westermanni

Recorded substrate and hydrology for locations with Merzomyia westermanni

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Interpretation of distribution maps