Belongs within: Chordeumatida.
The Cleidogonoidea are a group of millipedes with smooth sides on the metazona (Hoffman 1990).
Characters (Hoffman 1990): Adults with 28 or 30 body segments; collum small, not concealing head; tergal surface smooth and polished, or elevated into low, smooth tubercles; metaterga with well defined median longitudinal suture; metazona not produced into paranota, sides smooth; ozopores absent; mentum of gnathochilarium transversely divided, with small triangular promentum set off; ninth and tenth pairs of legs with coxal sacs in males.
<==CleidogonoideaH90
|--TrichopetalidaeH90
| |--TrichopetalumH90
| `--TrigenotylaH90
`--CleidogonidaeH90
|--PseudotremiaH90
|--TiganogonaH90
|--CleidogonaH90
| |--C. ceibana Chamberlin 1922K54
| `--C. majorH90
`--Hirsutogona Kraus 1954K54
|--*H. minutissima Kraus 1954K54
|--H. godmani (Pocock 1903) [=Cleidogona godmani]K54
|--H. mirabilis Kraus 1954K54
`--H. stolli (Pocock 1903) [=Cleidogona stolli]K54
*Type species of generic name indicated
References
[H90] Hoffman, R. L. 1990. Diplopoda. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 835–860. John Wiley & Sones: New York.
[K54] Kraus, O. 1954. Myriapoden aus El Salvador. Senckenbergiana Biologica 35 (5–6): 293–349.