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Halticotoma andrei - male

Halticotoma andrei - Male
Deming, Luna County, New Mexico, USA
September 24, 2017
Size: 2.7 mm to tip of abdomen
Coordinates: 32.2721, -107.7368
On sotol (Dasylirion wheeleri).
Coll. and det. as Halticotoma andrei Knight by J. T. Botz.

Although coloration can be the same for these two species, males of H. andrei and H. valida can be easily separated by the shape of the left clasper that sticks out rigidly from the left side of the abdominal apex. This clasper is long and narrow in H. andrei, short and blunt in H. valida. This structure is visible in the lateral and ventral photos.

Images of this individual: tag all
Halticotoma andrei - male Halticotoma andrei - male Halticotoma andrei - male Halticotoma andrei - male

Exteranl character
Is there any difference in external characters between the two species? I'm looking for the external differences for a long time, which can be shown in the pictures.

According to Knight (1968), the first antennomere is a little longer than the distance between eyes in H. andrei, and a little shorter than the distance between eyes in H. valida. Having examined dozens of specimens at the University of Arizona IC, I'd say this holds up, but is not easy to assess in a photo, since one or the other of these two features is usually foreshortened in the photo. A left lateral or posterior shot of a male is needed to see the difference in the left clasper.

Thanks again, Jason!

I was going from memory, and goofed. It's the second antennomere (II) that is compared with the distance between eyes. In H. andrei, II is as long as the distance between eyes plus the dorsal width of one eye. In H. valida, II is shorter than this distance (it may also be shorter or slightly more than the interocular length). You can see why the best scenario is when you have a male to examine!

Thanks, Jason!
As you know, the length, especially the length of the antenna greatly varies depending on the angles. So, it's hard to make a reference for ID on pictures. I wish there is something distinguisable on picture.

Moved from Halticotoma.

Nie ma za co!
Two more species to go!

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