13 genera are assigned to the class INARTICULATA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| CRANIIDA | Crania | J | u | R | |
| CRANIOPSIDA | Craniops | O | Cara-l | C | Tour |
| CRANIOPSIDA | Heliomedusa | Cm | Atda-u | Cm | Atda-u |
| TRIMERELLIDA | Adenus | O | Cara-u | O | Cara-u |
| TRIMERELLIDA | Dinobolus | O | Aren-u | S | Ludl |
| TRIMERELLIDA | Eodinobolus | O | Cara-l | O | Ashg-m |
| TRIMERELLIDA | Gasconsia | O | Ashg-l | O | Ashg-l |
| TRIMERELLIDA | Gyroselenella | O | Ashg-l | O | Ashg-l |
| TRIMERELLIDA | Machaerocolella | O | Cara-l | O | Ashg-l |
| TRIMERELLIDA | Prosoponella | O | Ashg-l | O | Ashg-l |
| TRIMERELLIDA | Trimerella | S | Ldov-l | S | Ludl-l |
| TRIMERELLIDA | Ussunia | O | Llde | O | Llde |
| TRIMERELLIDA | Vaculina | Cm | mMid | Cm | u |
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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).