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Agreed that there seems to be confusion on whether baumhaueri and hyalipennis are separate species or not. As I understand it, this would be baumhaueri, at the moment, in the UK.
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According to the first sentence here: http://www.robberflies.info/keyger/htmle/diohya.html
D. hyalipennis is present in U.K.
The current checklist of Diptera of the UK (November 2012) has this to say...
"Beuk (pers. comm.) and following him Stubbs (1996) suggested that hyalipennis (Fabricius, 1794) was the correct name for
Dioctria baumhaueri of the British list. This possible synonymy was first proposed by van der Goot (1961). Zoological Record
for 2001 reported the synonymising of Dioctria baumhaueri with D. hyalipennis (Fabricius, 1794) by Lehr (2001). Later authors
differed in their treatment, some accepting this synonymy but others regarding these species as distinct. Lehr was evidently
unaware of the synonymy by van der Goot and referred, as the authority for recognising this synonym, to Peus (1954) who
regarded them as possibly varieties of one species. This synonymy may be correct as they are separated primarily on leg colour,
hyalipennis having mainly yellow legs, sometimes with a dark patch above the apex of the anterior femora. British specimens
have darker legs and fit baumhaueri in this respect but there is a need for comparison with continental material and examination
of any surviving type material. Weinberg & Bächli (1995), who treat these species as separate, also distinguish them on the shape
of the posterior metatarsus but this has not proved reliable and further work is considered necessary to establish whether this
synonymy is correct (Malcolm Smart pers. comm.), so it is not adopted here."
It would seem that the name could change, but currently, baumhaueri is the name to use in the UK, then.
in Denmark hyalipennis is used, baumhaueri as a synonym. Tolmerus instead of Machimus, intricaria for intricarius.. many of the same species have different names as soon as you cross the border
edit: a discussion point, perhaps, what it means to adhere to the convention of one's country - eg. how does that affect the study of european flies. And does it show that no language is properly 'dead' so long as people are using it? I don't know
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