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Photo#1831972
Springtail 20

Springtail 20
Terre Haute, Vigo County, Indiana, USA
May 2, 2020
Size: 250 microns

Images of this individual: tag all
Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20 Springtail 20

Moved

Tullbergiidae
Anal spines and large post-antennal organ should be present, but are not visible...

 
Psuedocelli?
Hello Franz, Thanks for the ID. Are those Psuedocelli at the base of each antenna? I did not see grill-like PAO at the base of the antenna. I could try to re-image this one from different angles if you think it could be something else.

 
Indeed, it are pseudocelli
The pseudocelli in Tullbergiidae look quite different from those in Onychiuridae, more simple. Typically in Tullbergiidae is that there are 1+1 on the antennal bases and 1+1 on the back margin of the head (in other words 4 on the head). You can see the left back margin pseudocellus in your images : distinctly round.
The PAO in Tullbergiidae is quite narrow and long and is orientated transversally. You can see a small part of it in the head image just after the left antenna, you can see a few vesicles, the tip of the grid. The specimen is quite deformed. But if you could reimage the head in more lateral aspect then the PAO should become more visible. Also, it would be nice to have a lateral shot of anal spines, just to confirm that they are present.

 
More Images
Hello Frans. I was able to take more images at different angles for this specimen. What do you think?

 
Thx.
The PAO is clearly visible now. Wrt the anal spines : the papillae on which the anal spines are located are present, but the spines itself are broken off.
It is definitly Tullbergiidae.

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