8 genera are assigned to the class HYDROCONOZOA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| uncertain | Alatoconus | Cm | Boto | Cm | Boto |
| uncertain | Asteroconus | Cm | Boto | Cm | Boto |
| uncertain | Dasyconus | Cm | Boto | Cm | Boto |
| uncertain | Gastroconus | Cm | Boto | Cm | Boto |
| uncertain | Hydroconus | Cm | Atda | Cm | Boto |
| uncertain | Radioconus | Cm | Boto | Cm | Boto |
| uncertain | Tabulaconus | Cm | Boto | Cm | lMid |
| uncertain | Tuvaeconus | Cm | Boto | Cm | Boto |
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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence
Stage abbreviations follow Sepkoski (2002).