Adult habitat & habits
Clearings and tracksides, usually along streams or rivers.
April/June and at higher altitudes July to August/September. Larva: described and figured by Rotheray (1988a); mines stems and basal rosettes of Cirsium palustre; other species of Carduus and Cirsium are also cited as larval foodplants by Reemer et al (2009).. This species overwinters as a puparium.
Caltha, Ranunculus, Stellaria,Taraxacum.
Irish reference specimens
van der Goot (1981). The adult insect is illustrated in Bartsch et al (2009b), Stubbs and Falk (1983) and Torp (1994). This species is very similar to C. bracusi Vujic & Claussen. Distinctions between these two species are given by Vujic and Claussen (1994b). The surstyli of the male terminalia are figured by Stubbs and Falk (2002).
Fenno-Scandia south to the Pyrenees, montane in southern parts of its range; Britain eastwards through central Europe into European parts of Russia and on into much of Siberia. Added to the Irish list by Speight et al (1975).
The single specimen mentioned in Speight et al (1975) cannot be re-located and the Irish specimen subsequently recorded in Nash and Speight (1976) has proved to be misidentified. There have been no further records of C. fraterna from Ireland. The status of C. fraterna as an Irish insect must be regarded as doubtful and requiring confirmation. Until and unless the presence of this species in Ireland can be verified there is no adequate basis for including it on the Irish list.
Records submitted to Data Centre in 2021
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Speight, M. C. D. (2008) Database of Irish Syrphidae (Diptera). Irish Wildlife Manuals, No. 36. National Parks and Wildlife Service. Department of Environment, Heritage and Local Government, Dublin, Ireland.
Speight, M.C.D. (2014) Species accounts of European Syrphidae (Diptera), 2014. Syrph the Net, the database of European Syrphidae, vol. 78, 321 pp., Syrph the Net publications, Dublin.