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6025731 - Vostox - female

6025731 - Vostox - Female
Madera Canyon, Arizona, USA
June 25, 2007
Size: <1"

Moved from European Earwig.

Moved from Earwigs.

Forficula auricularia

I am wondering what your leve
I am wondering what your level of expertise is with the Dermaptera. I accidentally posted 2 images of this. One was ID'd as Labidura riparia, and one was frassed. Are you sure about this? Now it is the only one, and I can't see who previously determined one as L. riparia.

So take it with a grain of salt.

Labidura riparia is quite different. They have several characteristic features not seen here:
1. They're really big, especially compared to other species found in North America.
2. They have long antennae, with at leat 25 segments. I'm never 100-percent on counting antennal segments, but I can't get more than 12 out of this one.
3. They have a two-tone color-scheme on the back, as you can see in in this image:

Your image only looks two-toned because of the angle of the light. Allowing for the unnatural highlights shows the coloration of the tegmina (leathery forewings) to be consistent with that of a female Forficula auricularia:

Forficulidae have a characteristic shape to the feet that's arguably visible here: the second of the three tarsal segments is sort of ballooned out and extending under the third/outermost segment.

Look at the forceps on the female Forficula auricularia in the guide and on those of female Labidura riparia (the thumbnails above point to good examples). This specimen matches fairly well with the Forficula auricularia, but not very well with the Labidura riparia.

The dermaptera in North America are such a small group that it's entirely possible for a motivated amateur with some knowledge of taxonomy (In my case from a couple of college botany classes) to develop a working mastery of the limited number of choices represented here. I've read every recent article I can find online, and gone through the keys in those that have them.

There are some species I don't have enough information on, and new introductions may yet throw me for a loop- but I'm quite confident in my ability to tell Forficula auricularia from Labidura riparia

By the way: please fill in the date. I could venture a guess based on the EXIF data, but that relies entirely on whether the camera clock was set correctly at the time the image was taken.

I added the date. I had acci
I added the date. I had accidentally uploaded this image twice and one has been frassed. The other had been named by someone a L. riparia, but their name has disappeared.
I found this image without a name, in my earwig image folder. However in my database, I found that it was named as a female L. riparia. Compared to my 7003499 image that also had this determination, I thought it looked so different that a mistake had been made in the database, so I put it on BG.
Much to my surprise, it was then labeled as L. riparia female, like the one I already had, but which looked quite different to me. I normally put the determiner's name in an "identifier" field, but forgot to, so I don't know who had labeled it thus, or why. I hope they join in.
As you pointed out about the antenna, even I can see that doesn't agree with Labidura. So that was clearly wrong.
On the other hand, it didn't seem like the European Earwig either. It seems that the forceps are stouter and not as curved. I just don't know.

Maybe you're thinking of the male
Your image is quite consistent with the female of the species. Males' forceps are quite different:

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