Affiliated to the British Entomological and Natural History Society (BENHS)
You are not logged in.
The study group covers the family Oestridae of which there are probably only 9 extant species in Britain, and possibly even fewer in Ireland. The initial aim of the study group is to collate current and historic distributional data.
Oestridae larvae are internal parasites of various animals; most species being host-specific and unable to complete their life-cycle in the wrong type of animal. Some species affect domesticated livestock, and have suffered catastrophic declines or extinction due to improved animal husbandry, i.e. the widespread use of various drugs and poisons. The two Hypoderma species causing warbles in cattle were eradicated from Britain during the 1970s and 1980s; likewise, Gasterophilius must have suffered catastrophic declines in recent decades due to the 'worming' of horses. Infestation by the Sheep Nostril Fly, Oestrus ovis, is harder to diagnose and treat; nevertheless, it is probably uncommon in modern Britain and Ireland. The remaining resident British and Irish Oestridae are less at risk of national extinction as their hosts are Red Deer, Roe Deer and Reindeer.
Organiser: Andrew Grayson
Stuart, I collected a bot fly on 30 August 2010 in County Sligo, Ireland which I tentatively identified as Gasterophilus intestinalis using Colyer & Hammond. I have no key works to the family. Anything observed in Ireland is a worthwhile record as so little recording is done here. If you are interested I could arrange to photograph the specimen in order to get an accurate identification.
Hello Don, By all means do provide a photograph, and I'll give you an identification. Have you got any further details such as grid refernce, site/area name, etc. Best wishes, Andrew Grayson
I netted one of two bot flies that were trying to land on a pony in the New Forest. It looks superficially like pictures of Gasterophilus intestinalis on the internet (although the wing cloud is somewhat darker). Are there any keys to this family? Is it safe to record the species on the basis of internet pictures or are there similar species? Many thanks for any info.