76 genera are assigned to the class ORTHOTHECIMORPHA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| CIRCOTHECIDA | Arathecus | Cm | Tomm-l | Cm | Tomm-l |
| CIRCOTHECIDA | Asijatheca | Cm | Atda-u | Cm | Atda-u |
| CIRCOTHECIDA | Circotheca | V | N-Da-l | S | Ludl |
| CIRCOTHECIDA | Conotheca | V | N-Da-u | Cm | Boto-u |
| CIRCOTHECIDA | Costatheca | Cm | Atda-u | Cm | Atda-u |
| CIRCOTHECIDA | Crossbitheca | V | N-Da | Cm | Tomm-l |
| CIRCOTHECIDA | Ensitheca | Cm | Tomm-l | Cm | Tomm-l |
| CIRCOTHECIDA | Extentitheca | Cm | Tomm-u | Cm | Tomm-u |
| CIRCOTHECIDA | Khetatheca | V | N-Da | V | N-Da |
| CIRCOTHECIDA | Kotuyitheca | V | N-Da | Cm | Tomm-l |
| CIRCOTHECIDA | Kugdatheca | Cm | Tomm-l | Cm | Tomm-u |
| CIRCOTHECIDA | Kunyangotheca | Cm | Tomm | Cm | Tomm |
| CIRCOTHECIDA | Ladatheca | V | N-Da-u | Cm | Tomm-u |
| CIRCOTHECIDA | Laratheca | Cm | Tomm-l | Cm | Tomm-u |
| CIRCOTHECIDA | Leibotheca | Cm | Tomm | Cm | Tomm |
| CIRCOTHECIDA | Loculitheca | V | N-Da-u | Cm | Tomm-u |
| CIRCOTHECIDA | Mojczatheca | O | Cara-u | O | Cara-u |
| CIRCOTHECIDA | Petasotheca | Cm | Boto-u | Cm | Boto-u |
| CIRCOTHECIDA | Spinulitheca | V | N-Da-u | Cm | Atda-l |
| CIRCOTHECIDA | Stimulitheca | Cm | Atda-u | Cm | Atda-u |
| CIRCOTHECIDA | Turcutheca | V | N-Da-u | Cm | Boto |
| CIRCOTHECIDA | Uniformitheca | Cm | Tomm-u | Cm | Atda-u |
| EXILITHECIDA | Exilitheca | Cm | Tomm-l | Cm | Tomm-u |
| EXILITHECIDA | Gracilitheca | Cm | Tomm-u | Cm | mMid |
| EXILITHECIDA | Holmitheca | Cm | Atda-u | Cm | Boto-u |
| EXILITHECIDA | Lenatheca | Cm | Tomm-u | Cm | Boto-l |
| EXILITHECIDA | Micatheca | Cm | Boto-l | Cm | Boto-u |
| EXILITHECIDA | Obliquatheca | Cm | Atda | Cm | Boto |
| EXILITHECIDA | Sokolovitheca | Cm | Tomm-u | Cm | lMid-l |
| GLOBORILIDA | Cobboldiella | Cm | Atda-u | Cm | Atda-u |
| GLOBORILIDA | Globorilus | Cm | Atda | Cm | Tojo |
| GLOBORILIDA | Globoritubulus | Cm | l | Cm | l |
| GLOBORILIDA | Neogloborilus | Cm | Atda-u | Cm | Atda-u |
| GLOBORILIDA | Sulcagloborilus | Cm | Tomm-u | Cm | Tomm-u |
| GLOBORILIDA | Xiadongtubulus | Cm | l | Cm | l |
| ORTHOTHECIDA | Adyshevitheca | Cm | Atda-u | Cm | Boto-l |
| ORTHOTHECIDA | Aldanotheca | Cm | Tomm-l | Cm | Tomm-u |
| ORTHOTHECIDA | Allatheca | Cm | Tomm-l | Cm | Atda-u |
| ORTHOTHECIDA | Ancheilotheca | Cm | Tomm | Cm | Tomm |
| ORTHOTHECIDA | Antiquatheca | Cm | Tomm-u | Cm | Tomm-u |
| ORTHOTHECIDA | Bactrotheca | O | Aren-u | O | Ashg-m |
| ORTHOTHECIDA | Bolitheca | D | Emsi | D | Emsi |
| ORTHOTHECIDA | Bucanotheca | Cm | Tomm-u | Cm | Tomm-u |
| ORTHOTHECIDA | Carinitheca | Cm | Atda | Cm | Atda |
| ORTHOTHECIDA | Ceratotheca | S | Ludl | D | Gedi |
| ORTHOTHECIDA | Chelsonella | Cm | m | O | Trem |
| ORTHOTHECIDA | Contitheca | Cm | Boto | Cm | Dres-u |
| ORTHOTHECIDA | Curtitheca | Cm | Tomm | Cm | Tomm |
| ORTHOTHECIDA | Devoniotheca | D | l | D | l |
| ORTHOTHECIDA | Ebianotheca | Cm | Tomm | Cm | Tomm |
| ORTHOTHECIDA | Egdetheca | Cm | Tomm-l | Cm | Boto |
| ORTHOTHECIDA | Eonovitatus | Cm | Tomm-u | Cm | Atda-u |
| ORTHOTHECIDA | Foersteotheca | S | Wenl | S | Wenl |
| ORTHOTHECIDA | Grandicornus | Cm | Atda | Cm | Atda |
| ORTHOTHECIDA | Inflaticornus | Cm | Boto | Cm | Boto |
| ORTHOTHECIDA | Isititheca | Cm | Tomm-u | Cm | Tomm-u |
| ORTHOTHECIDA | Kygmaeoceras | Cm | Trep-u | Cm | Trep-u |
| ORTHOTHECIDA | Lentitheca | Cm | l | Cm | l |
| ORTHOTHECIDA | Lophotheca | V | N-Da-u | Cm | Tomm |
| ORTHOTHECIDA | Majatheca | Cm | Tomm-u | Cm | Boto |
| ORTHOTHECIDA | Malykanotheca | Cm | Atda-l | Cm | Atda-l |
| ORTHOTHECIDA | Minitheca | Cm | Atda | Cm | Atda |
| ORTHOTHECIDA | Mooritheca | Cm | Tomm-u | Cm | Boto |
| ORTHOTHECIDA | Neobactrotheca | D | Emsi | D | Emsi |
| ORTHOTHECIDA | Nephrotheca | O | Trem | O | Ashg-m |
| ORTHOTHECIDA | Nikatheca | Cm | Tomm-l | Cm | Tomm-l |
| ORTHOTHECIDA | Novitatus | Cm | Atda-l | Cm | Boto-l |
| ORTHOTHECIDA | Orthotheca | Cm | Tomm-l | D | Eife |
| ORTHOTHECIDA | Panitheca | O | Llde-l | O | Cara-m |
| ORTHOTHECIDA | Plicitheca | Cm | Atda-u | Cm | Boto-u |
| ORTHOTHECIDA | Renitheca | Cm | Boto-l | Cm | Boto-l |
| ORTHOTHECIDA | Semielliptotheca | Cm | Tomm-l | O | m |
| ORTHOTHECIDA | Tcharatheca | Cm | lMid | Cm | u |
| ORTHOTHECIDA | Tchuranitheca | Cm | Tomm-u | Cm | Atda-u |
| ORTHOTHECIDA | Tetratheca | Cm | Tomm-u | Cm | Atda-u |
| ORTHOTHECIDA | Trapezotheca | Cm | Tomm-u | O | Llvi-l |
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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).