Belongs within: Diplura.
The Japygidae are a group of diplurans with forcipate cerci and trichobothria on segments 4–6 of the antennae (Condé & Pagés 1991). Macrosetae are smooth and lack barbules in members of the subfamily Japyginae (Ferguson 1990).
Characters (from Condé & Pagés 1991): Trichobothria present on segments 4–6 of antenna; mandible without prostheca; labial palps present; four pairs of thoracic spiracles; pretarsus without empodium on ventral side of the two lateral claws; S1–7 with minute membranous vesicles; cerci one-segmented, forcipate.
<==Japygidae
|--Provalljapyx Silvestri 1949 [Provalljapyginae]F90
|--JapygellinaeW39
| |--AllurjapyxW39
| |--EpijapyxW39
| |--JapyginusW39
| `--JapygellusW39
|--IndiajapyginaeW39
| |--ParindjapyxW39
| `--NeojapyxW39
`--JapyginaeS62
|--OpisthjapyxW39
|--CatajapyxW39
|--MixojapyxW39
|--MegajapyxW39
|--HecajapyxS62
|--Occasjapyx japonicusS62, SC17
|--AustrjapyxS62
|--Japygianus wheeleriWM70, CP91
|--Japyx Halliday 1863W39
| |--J. solifugusWS10
| `--J. westraliense Wom. 1934W39
|--Chiljapyx Smith 1962S62
| `--*C. caltagironei Smith 1962S62
|--Penjapyx Smith 1962S62
| `--*P. altus Smith 1962S62
|--Hapljapyx Silvestri 1948-1949S62
| `--*H. lopesi Silvestri 1948-1949S62
|--Nelsjapyx Smith 1962S62
| |--*N. hichinsi Smith 1962S62
| `--N. soldadi Smith 1962S62
|--Rossjapyx Smith 1962S62
| |--*R. australis Smith 1962S62
| `--R. anodus (Silvestri 1949) [=Hapljapyx anodus; incl. H. subanodus Silvestri 1949]S62
|--Valpjapyx Smith 1962S62
| |--*V. botani Smith 1962S62
| `--V. talcae Smith 1962S62
|--Teljapyx Silvestri 1949S62
| |--*T. riestrae Silvestri 1949S62
| |--T. megalocerus (Silv. 1901)S62
| `--T. profundus Smith 1962S62
|--Merojapyx Silvestri 1949S62
| |--*M. speggazzinii Silvestri 1949S62
| |--M. bidentatus [=M. bidentaus (l. c.)]S62
| |--M. porteri Silvestri 1949S62
| `--M. riverosi Silvestri 1949S62
|--NotojapyxWM70
| |--N. mjobergiCP91
| `--N. tillyardiCP91
| |--N. t. tillyardiCP91
| `--N. t. pagesiCP91
|--MetajapyxW39
| |--M. froggatti (Silvestri 1930) [=Japyx (Metajapyx) froggatti; incl. J. augens Silv. 1930]W39
| |--M. glauerti (Wom. 1934) [=Japyx (Metajapyx) glauerti]W39
| |--M. leae (Silvestri 1930) [=Japyx (Metajapyx) leae]W39
| |--M. longiseta (Silvestri 1908) [=Japyx (Metajapyx) longiseta]W39
| |--M. michaelseni (Silvestri 1930) [=Japyx (Metajapyx) michaelseni]W39
| |--M. mjoebergi (Silvestri 1928) [=Japyx (Metajapyx) mjoebergi]W39
| |--M. nichollsi (Wom. 1934) [=Japyx (Metajapyx) nichollsi]W39
| |--M. onkaparinga (Wom. 1935) [=Japyx (Metajapyx) onkaparinga]W39
| |--M. suterraneusRS10
| `--M. tillyardii (Silvestri 1930) [=Japyx (Metajapyx) tillyardii]W39
|--IndjapyxWM70
`--Burmjapyx glauertiWM70
*Type species of generic name indicated
References
[CP91] Condé, B., & J. Pagés. 1991. Diplura. In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 1 pp. 269–271. Melbourne University Press: Carlton (Victoria).
[F90] Ferguson, L. M. 1990. Insecta: Diplura. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 951–963. John Wiley & Sones: New York.
[RS10] Regier, J. C., J. W. Shultz, A. Zwick, A. Hussey, B. Ball, R. Wetzer, J. W. Martin & C. W. Cunningham. 2010. Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences. Nature 463: 1079–1083.
[SC17] Schwentner, M., D. J. Combosch, J. P. Nelson & G. Giribet. 2017. A phylogenomic solution to the origin of insects by resolving crustacean-hexapod relationships. Current Biology 27: 1818–1824.
[S62] Smith, L. M. 1962. Japygidae of South America. 3: Japygidae of Chile. Proceedings of the Biological Society of Washington 75: 273–292.
[WM70] Wallace, M. M. H., & I. M. Mackerras. 1970. The entognathous hexapods. In: CSIRO. The Insects of Australia: A textbook for students and research workers pp. 205–216. Melbourne University Press.
[WS10] Wang, M., S. Sun, C. Li & X. Shen. 2010. Distinctive mitochondrial genome of the calanoid copepod Calanus sinicus, a useful molecular marker for phylogenetic and population studies. In: China-Russia Bilateral Symposium: Proceedings of the China-Russia Bilateral Symposium of “Comparison on Marine Biodiversity in the Northwest Pacific Ocean”, 10–11 October 2010, Qingdao (China) pp. 187–192. Institute of Oceanology, Chinese Academy of Sciences; A. V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences.
[W39] Womersley, H. 1939. Primitive Insects of South Australia: Silverfish, springtails, and their allies. South Australian Branch of the British Science Guild: Adelaide.