78 genera are assigned to the class HYOLITHOMORPHA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| HYOLITHIDA | Aimitus | Cm | Tomm-u | Cm | Atda-u |
| HYOLITHIDA | Altaicornus | Cm | Atda-u | Cm | Atda-u |
| HYOLITHIDA | Ambrolinevitus | Cm | Atda-u | O | u |
| HYOLITHIDA | Amydaicornus | Cm | mMid | Cm | mMid |
| HYOLITHIDA | Anabaricornus | Cm | mMid | Cm | mMid |
| HYOLITHIDA | Angusticornus | Cm | Atda-u | Cm | Boto-l |
| HYOLITHIDA | Atdabanithes | Cm | Tomm-u | Cm | Atda-u |
| HYOLITHIDA | Borealicornus | Cm | Atda | Cm | Boto-l |
| HYOLITHIDA | Brevilabiatus | Cm | Atda | Cm | Atda |
| HYOLITHIDA | Burithes | Cm | Tomm-u | Cm | Boto-l |
| HYOLITHIDA | Camerotheca | Cm | Boto | Cm | Boto |
| HYOLITHIDA | Carinolithes | Cm | l | O | Cara-u |
| HYOLITHIDA | Cavernolites | O | Aren | O | Cara |
| HYOLITHIDA | Crestjahitus | Cm | Tomm-u | Cm | mMid |
| HYOLITHIDA | Decipilites | O | Ashg-m | O | Ashg-u |
| HYOLITHIDA | Diplotheca | Cm | Boto | Cm | Boto |
| HYOLITHIDA | Doescherina | Cm | m | Cm | Fran |
| HYOLITHIDA | Doliutus | Cm | Tomm-u | Cm | Boto |
| HYOLITHIDA | Dorsojugatus | Cm | Tomm-u | Cm | Atda-l |
| HYOLITHIDA | Dorsolinevitus | Cm | Tomm-u | O | m |
| HYOLITHIDA | Elegantilites | O | Aren | O | Ashg-u |
| HYOLITHIDA | Emarites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Erraticornus | Cm | Boto-l | Cm | Boto-l |
| HYOLITHIDA | Firmicornus | Cm | Atda-u | Cm | Boto-l |
| HYOLITHIDA | Galicornus | Cm | Atda-u | Cm | Boto-l |
| HYOLITHIDA | Gompholites | O | Aren | O | Ashg-m |
| HYOLITHIDA | Goniocornus | Cm | Atda-u | Cm | Atda-u |
| HYOLITHIDA | Grantitheca | Cm | l | Cm | l |
| HYOLITHIDA | Hallotheca | D | Give-l | D | Give-l |
| HYOLITHIDA | Haplophrentis | Cm | lMid-u | Cm | mMid-u |
| HYOLITHIDA | Helenia | Cm | Atda-u | Cm | Boto |
| HYOLITHIDA | Hyolithes | Cm | Atda-l | P | Guad-u |
| HYOLITHIDA | Hyptiotheca | Cm | Atda-u | Cm | Tojo |
| HYOLITHIDA | Ingolitotheca | Cm | Boto-u | Cm | Boto-u |
| HYOLITHIDA | Insignicornus | Cm | Boto-l | Cm | Boto-l |
| HYOLITHIDA | Jacuticornus | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Jacutolitus | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Joachimilites | O | Llvi-u | O | Ashg-u |
| HYOLITHIDA | Ketemecornus | Cm | Atda-u | Cm | Tojo-l |
| HYOLITHIDA | Korilithes | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Kuonamkicornus | Cm | Atda-u | Cm | Boto-l |
| HYOLITHIDA | Laticornus | Cm | Atda-u | Cm | Atda-u |
| HYOLITHIDA | Lenalitus | Cm | Atda-u | Cm | Atda-u |
| HYOLITHIDA | Leolites | O | Llvi-u | O | Ashg-m |
| HYOLITHIDA | Linevitus | Cm | Tomm | S | Ldov |
| HYOLITHIDA | Lirotheca | C | Step-l | C | Step-l |
| HYOLITHIDA | Meitanovitus | Cm | Tomm | Cm | Tomm |
| HYOLITHIDA | Microcornus | Cm | Tomm-u | Cm | Boto-u |
| HYOLITHIDA | Neopauxillites | Cm | Boto | Cm | Boto |
| HYOLITHIDA | Nevadotheca | Cm | Boto | Cm | Fran |
| HYOLITHIDA | Nitoricornus | Cm | Boto-l | Cm | Boto-l |
| HYOLITHIDA | Notabilitus | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Novakotheca | Cm | mMid | Cm | mMid |
| HYOLITHIDA | Oblisicornus | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Oboedalites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Oxytus | Cm | Tomm-u | Cm | Atda-l |
| HYOLITHIDA | Parakorilithes | Cm | Boto | Cm | Boto |
| HYOLITHIDA | Parkula | Cm | Atda-u | Cm | Atda-u |
| HYOLITHIDA | Patholites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Pauxillites | O | Trem | O | Llde-l |
| HYOLITHIDA | Planotheca | Cm | Boto-l | Cm | Boto-l |
| HYOLITHIDA | Pterigotheca | D | l | D | l |
| HYOLITHIDA | Quadrotheca | Cm | Tomm-u | O | Cara-u |
| HYOLITHIDA | Quinquelithes | Cm | l | Cm | l |
| HYOLITHIDA | Rarissimetus | Cm | Tomm-u | Cm | Atda-l |
| HYOLITHIDA | Recilites | O | Llde-l | O | Cara-u |
| HYOLITHIDA | Rodentilites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Slapylites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Sulcavitus | Cm | Atda | O | l |
| HYOLITHIDA | Tajinella | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Tizilites | Cm | lMid | Cm | lMid |
| HYOLITHIDA | Trapezovitus | Cm | Atda-l | Cm | Boto-u |
| HYOLITHIDA | Tulenicornus | Cm | Boto | Cm | mMid |
| HYOLITHIDA | Tuojdachithes | Cm | Tomm-u | Cm | Atda-u |
| HYOLITHIDA | Virgatotheca | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Virgulaxonaria | O | l | O | l |
| HYOLITHIDA | Yacutolithuus | Cm | Tomm-u | Cm | Tomm-u |
| HYOLITHIDA | Yankongovitus | Cm | Tomm | Cm | Tomm |
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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).