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Cheilosia grossa

 
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Cheilosia grossa Reply with quote

Cheilosia grossa (FallÚn, 1817)

Identification ease/difficulty: 2

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Last edited by stuart on Wed Jun 01, 2005 9:22 pm; edited 1 time in total
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sun May 29, 2005 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

Species account from Provisional atlas of British hoverflies, Ball & Morris, 2000.

Cheilosia grossa (FallÚn, 1817) Cheilosia corydon (Harris)

Biology: The larvae mine the stems and roots of a wide range of thistles (Cirsium and Carduus spp.), especially Cirsium palustre, which then tend to become stunted and multi-stemmed. Females have been observed to oviposit on small, young, flowering spikes growing from the centre of the rosette (Rotheray, pers. comm.). Adults are found visiting flowers such as Salix catkins in the early spring, usually in sheltered situations such as woodland rides or edges. Males typically hover at considerable height

Distribution: Adult records are scarce, probably because this very early-flying species is often missed by collectors, but also because individuals tend to fly high and out of reach, hovering or visiting flowers near the tops of bushes. It is much easier to record by searching for larvae in thistle stems, and records gathered using this method have shown that it is not uncommon throughout most of Britain, although records are scarce in Wales and south-west England
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