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Scotoleon nigrilabris
Photo#381181
Copyright © 2010
Rich Olsen
Dragonfly -
Scotoleon nigrilabris
-
Moses Lake, Grant County, Washington, USA
August 21, 2009
Please tell what this is. I'm assuming it is a damselfly or a darner, but i can't find a match for it. Thank you.
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Contributed by
Rich Olsen
on 2 April, 2010 - 3:29pm
Last updated 29 June, 2022 - 5:13pm
Moved
Moved from
Clathroneuria coquilletti
.
Antennae differ quite significantly.
…
Jonathan Hoskins
, 23 November, 2021 - 9:05pm
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S nigirilabris
While I agree that this is a Scotoleon, it looks odd for C nigrilabris to me, and I don't think that the photo is sufficient to make a species level ID.
…
Steven Mlodinow
, 29 June, 2022 - 3:14pm
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Scotoleon
If the oddness is in terms of the abdomen, that would likely be because this is a male. Two of yours (and the vast majority of photos) are females. We have particularly few male records for the species (in fact, after annotating sex, we only have 4 other images of males on BugGuide to 32 images of females). Also, depending on the positioning of the abdomen, more or less yellow may show from underneath the tergies and sternites. As far as
Scotoleon
species, the vast majority don't occur this far north and, in our area, are more restricted to the south(west)ern states. In fact, the only other species reported this far north by Penny et al. (1997) is
S. nivatensis
, which is very different in the color of the pterostigmas, wing pigmentation, and a darker body (see tentative
ID by Leon Tavares
).
…
Jonathan Hoskins
, 29 June, 2022 - 6:42pm
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I understand the differences between males and females
I was commenting on the pattern on the pronotum, which is very hard to assess in this photo, and generally important in the ID of Scotoleon. It is also well outside the stated range in BugGuide and well north of any other records in BugGuide or in iNat.
If S nigrilabris is known from WA (or adjacent areas) and other Scotoleon aren't, then I can't argue.
…
Steven Mlodinow
, 29 June, 2022 - 8:17pm
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Stange (2004) and Stange (1970)
Stange (2004)
directly places the species in Washington state. I still need to update a number of our ranges that were expanded as of that book but haven't had a good time to run through all of them yet. Looking at known records in the northwest corner of the range of the genus (BC to OR to WY TO MY), there are fairly sparse species records. Now, that being said, some species aren't very well studied, so range data isn't a definitive (take, for example, the population of
Vella americana
in Texas, readily distinguished by hindwing structure, not found in the literature and fairly well outside of the previously-known range). Here are the species with existing records there (bold entries noting records not in our currently-reported ranges):
•
S. nigrilabris
: ID, MT,
WA
, WY
•
S. nivatensis
: ID, OR
•
S. peregrinus
: BC, WY
Now, as far as patterning, that's generally less reliable than looking at male terminalia (though
S. nigrilabris
is rather consistent compared to some other widespread species). Using Stange (1970), the length of the terminalia, and what can be seen of its structure, seem to point strongly to this species as well (we could sort of consider 3 groupings of terminalia as long, short, and stubby*, where this would fall under short but seemingly not stubby). I arrive at couplet 3, where the yellow-color of both the pale body parts and the pterostigma single out
S. nigrilabris
. Come to think of it, I don't recall another
Scotoleon
with a yellow pterostigma, though Leon Tavares could say more definitively.
* "long" = at least 3/4 the length of the 8th abdominal segment; "short" being less than 1/2 the length of the 8th but 3x as long as wide; "stubby" being less than 1/2 the length of the 8th but no more than 2x as long as wide.
…
Jonathan Hoskins
, 29 June, 2022 - 9:41pm
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Moved
Moved from
Antlions
.
…
Ken Wolgemuth
, 23 May, 2010 - 12:27pm
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#381181 Identification – Clathroneuria coquilletti
ID
…
John D. Oswald
, 23 May, 2010 - 12:23pm
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Moved
Moved from
ID Request
.
…
Ken Wolgemuth
, 2 April, 2010 - 5:43pm
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Re: Dragonfly
Myrmeleontidae looks like a good match, but I wouldn't know how to narrow it down further than that.
…
Natalie McNear
, 2 April, 2010 - 4:09pm
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Antlion Brachynemurus abdominalis
Thank you, i believe that is what it is. It looks like what is in my picture.
…
Rich Olsen
, 2 April, 2010 - 5:38pm
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Looks a bit like
Brachynemurus abdominalis
Might be something close to that, at any rate. Maybe an expert will be able to say for sure.
…
Ken Wolgemuth
, 2 April, 2010 - 4:52pm
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Interesting...
I'm thinking it's neither... Zygopterans should have no easily-visible antennae. Some kind of neuropteran perhaps? I'll do some poking around.
…
Natalie McNear
, 2 April, 2010 - 4:05pm
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