- Archaicusporites asturicus
- Archaicusporites sp
- Archaicusporites torrestionensis
- Archamamelis
- Archamamelis bivalvis
- Archeactinomyces
- Archeactinomyces proliferans
- Archeamoeba
- Archeamoeba devorans
- Archeamoeba proteiformis
- Archeampelos acerifolia
- Archebacterium
- Archebacterium streptoides
- Archechlamydobacter
- Archechlamydobacter madagascariensis
- Archechytridium
- Archechytridium operculatum
- Archecoccoides
- Archecoccoides goujetii
- Archedesmoides
- Archedesmoides esthoniensis
- Archedesmoides granulatus
- Archegoniatae
- Archehansenia
- Archehansenia pachycingula
- Archela sp. Rao & Raje.,1996
- Archemegabacter
- Archemegabacter speciosus
- Archemicramoeba
- Archemicramoeba chitinovorax
- Archemicroccocus
- Archemicroccocus esthoniensis
- Archeolithophyllum missouriensum
- Archeopyle type B
- Archeotectatum
- Archeotectatum reticulatum
- Archeotectatum sarjeanti
- Archeotectatum sarjeantii
- Archeotriletes
- Archeotriletes conspicuus
- Archeotriletes hamulus
- Archeotriletes honestus
- Archeozonotriletes fenestratus
- Archeozonotriletes microreticulatus
- Archeozonotriletes sp