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Helophilus affinis

 
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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: Helophilus affinis Reply with quote

Helophilus affinis Wahlberg, 1844

Identification ease/difficulty: 5

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

PostPosted: Sun May 29, 2005 8:41 am    Post subject: Species account from the Provisional atlas Reply with quote

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

Helophilus affinis Wahlberg, 1844

Biology: The larvae are undescribed. According to Speight (1989), it is associated with small water bodies in unimproved grassland, acid fen and the edge of raised bogs. Adults hover over small pools

Distribution: This species was recently added to the British list by Stuke (1996), based on a single specimen in the Royal Museum of Scotland collected by A.B.Duncan in August 1982 on Fair Isle, and originally identified as H. hybridus. It has been rapidly extending its range southwards from Scandinavia and northern Europe in recent decades. It has been recorded regularly from Denmark (previously only isolated specimens), and for the first time in the Netherlands and N.W.Germany since 1980 and recently in S.W.Germany and Switzerland (Speight, 1998). Speight (1988a) predicted its occurrence in Britain, and gives a key to separate it from the other British members of the genus
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