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Subgenus Eoseristalis (Eristalis Subgenus Eoseristalis)
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Orange-legged Drone Fly (Eristalis flavipes)
Photo#877532
Copyright © 2013
Charley Eiseman
Criorhina? -
Eristalis flavipes
Northfield, Franklin County, Massachusetts, USA
September 19, 2013
Images of this individual:
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Contributed by
Charley Eiseman
on 20 December, 2013 - 3:45pm
Last updated 6 January, 2014 - 5:15pm
Moved
Moved from
Subgenus Eoseristalis
.
…
Charley Eiseman
, 6 January, 2014 - 5:15pm
Moved
Moved from
Syrphid Flies
.
…
Kelsey J.R.P. Byers
, 23 December, 2013 - 7:45am
Looks more like Eristalis to
Looks more like
Eristalis
to me -
Criorhina
has a straight R4+5 vein, while this fly's vein is curved. Facial shape also looks wrong, though it's hard to tell while this fly is happily feeding!
…
Kelsey J.R.P. Byers
, 20 December, 2013 - 4:01pm
Interesting
I didn't realize
Eristalis
could have such a furry abdomen.
…
Charley Eiseman
, 20 December, 2013 - 4:18pm
Eristalis tenax is pretty un-
Eristalis tenax
is pretty un-hairy, but a fair number of
Eristalis (Eoseristalis)
are fairly hairy - for example,
E. anthophorina
and
E. fratercula
:
and
Someone else just posted an
Eristalis
and was also surprised by the hairy abdomen, so you're not alone! It surprised me too when I realized the furry fly I'd caught was indeed
Eristalis
- so furry.
…
Kelsey J.R.P. Byers
, 20 December, 2013 - 4:23pm
Using these wonderfully clear
Using these wonderfully clear images, I've keyed this out to
Eristalis bardus
- the arista is hairy at the base (hard to see on most images, but not on these!), eye pile evenly distributed (so not
E. tenax
, which is obvious otherwise), and the bright orange posterior tarsus and overall bumblebee-like appearance are diagnostic of
E. bardus
. Nice fly!
Later: of course,
E. bardus
doesn't seem to be recognized as a species, and may be
E. flavipes
- going to dig for a bit to see if they've been synonymized.
…
Kelsey J.R.P. Byers
, 5 January, 2014 - 5:39pm
The source I need to look at
The source I need to look at is Telford's 1970 "
Eristalis
(Diptera: Syrphidae) from America North of Mexico" - I'll go grab a look at my university library tomorrow afternoon while some samples run. Sadly we don't have the 1970s available online! So, for now, I'll live this lovely fly unmoved and we'll see what happens. Thanks for your patience!
…
Kelsey J.R.P. Byers
, 5 January, 2014 - 6:03pm
... I'm an idiot, already had
... I'm an idiot, already had the paper on my laptop! So it gets weirder. The "Key to the Genera of Nearctic Syrphidae" lists
E. flavipes
, but not
E. bardus
, as a species, as do the other resources there (such as the Field Guide to the Flower Flies of Ontario).
Telford (1970) lists
E. flavipes
as a synonym of
E. bardus
- and states that
bardus
is "the valid name for the species because of priority." (
bardus
dates to 1829,
flavipes
to 1849). The original type specimens were lost.
Here's what I propose - let's move this fly to
flavipes
for now, and I'll post on the Taxonomy Forum asking for thoughts. Sound good?
…
Kelsey J.R.P. Byers
, 6 January, 2014 - 5:06pm
Sounds good
Strange that several references list both as valid species--
ITIS
being another example. If Telford (1970) was the last revision of the genus, it seems like we should go with
E. bardus
, but maybe it makes sense to ask one of the authors of the new key.
…
Charley Eiseman
, 6 January, 2014 - 5:15pm
Say names
Bardus
is a Say name (
Milesia bardus
Say, 1829). Say's insect collection was eaten by beetles, leaving doubt of the identity of his species. Some authors have applied his names to the most similar or most common species matching the description. Others have refused to use his names without a type specimen.
Wirth et al. (in Stone 1965
(
1
)
) gave
bardus
precedence over
flavipes
Walker. They also noted
Musca americana
Swederus 1787 as the probable oldest name, but invalid as a junior homonym of a Fabricius name.
…
John F. Carr
, 11 January, 2014 - 3:29pm
Ahh - I didn't realize it was
Ahh - I didn't realize it was beetles, just that it was lost! Seems a somewhat reasonable argument for concern over the species identities. I may need to email one of the syrphid academics to ask if they have thoughts on a more modern key or at least species list...
…
Kelsey J.R.P. Byers
, 11 January, 2014 - 3:40pm
Thanks!
According to
this page
, that is in subgenus
Eristalis
. Is that correct?
…
Charley Eiseman
, 5 January, 2014 - 5:46pm
Hmm. If it is - as that page
Hmm. If it is - as that page suggests - synonymized with
E. flavipes
, it should still be in subgenus
Eoseristalis
- as I understand it, subgenus
Eristalis
only contains one species in our area,
E. tenax
, which is introduced.
…
Kelsey J.R.P. Byers
, 5 January, 2014 - 5:50pm