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For the United States & Canada
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Genus Pogonognathellus

Big Springtail - Pogonognathellus elongatus Giant springtail - Pogonognathellus elongatus large springtail - Pogonognathellus Springtail #2 - Pogonognathellus Springtail  - Pogonognathellus Pogonognathellus dubius? - Pogonognathellus dubius giant springtail - Pogonognathellus Unidentified  - Pogonognathellus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Collembola (Springtails and allies)
Order Entomobryomorpha (Elongate-bodied Springtails)
Family Tomoceridae
Genus Pogonognathellus
Explanation of Names
Pogonognathellus Paclt 1944
21 spp. total(1), 5 spp. in AK & Canada(2)
Antennae tapering, compared to more even diameter in Tomocerus
Tomocerus vs Pogonognathellus:
In Tomocerus, the long 3rd antennal segment is subcylindrical vs tapering in Pogonognathellus

Also, the ratio of the 3rd antennal segment to the 4th in Pogonognathellus is much larger than in Tomocerus, and the 4th antennal segment is much shorter than the 2nd in Pogonognathellus, while in Tomocerus they are subequal in length.
In the US, large (~4‒5 mm) Pogonognathellus are represented by species that can be distinguished based on the length of the antennae. As a rule of thumb:
antennae < body ∴ P. flavescens (can be confused with Tomocerus minor and/or vulgaris)
antennae = body ∴ P. dubius
antennae > body ∴ P. elongatus
NB: antennae must be intact (the short antennomere 4 present)
In Tomocerus, only antennomeres 1 & 2 have scales; in Pogonognathellus all the antennomeres do. ―Frans Janssens