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Photo#92604
large speckled springtail - Tomocerus

large speckled springtail - Tomocerus
Windham, Rockingham County, New Hampshire, USA
Size: about 4 mm
Collected and photographed Jan. 1, 2007 by sifting hand-shredded moss and fungus samples gathered Dec. 2, 2006 from wooded area.

When the subject is positioned somewhat end-on to the camera, I fudge its measured length to accommodate the angle. That's the case with this one. The smaller humpback springtail is about 1.6mm.

Moved

Two members of the Entomobryomorpha
Entomobryomorpha are characterised by a reduced prothorax (it is not visible in dorsal aspect). In other words the first dorsally visible thoracic segment is in fact the second one! It appears as if Entomobryomorpha have only 2 thoracic segments...
The large specimen is of the family Tomoceridae. Genus Tomocerus sensu lato. Possibly Tomocerus vulgaris. It looks speckled because it lost most of its scales cover... For a more sure genus diagnosis, we need to see the ventral side, we have to get an idea about the relative size of the dental spines array.
The small humpback is family Entomobryidae, subfamily Lepidocyrtinae, genus Lepidocyrtus.

 
Oh,
s.l. is sensu lato abbreviated :-) Thanks, Frans.

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