- Arcicolpites
- Arcicolpites hirpurensis
- Arcosphaeridium
- Arcosphaeridium diversispinosum
- Arcosphaeridium poriferum
- Arcosticum elegans
- Arcotriporites
- Arcotriporites asteroides
- Arctacellularia
- Arctacellularia doliiformis
- Arctacellularia ellipsoidea
- Arctacellularia gigantea
- Arctacellularia kelleri
- Arctacellularia sp
- Arctacellularia sp. Guni.,1987
- Arctacellularia sp.1
- Arctacellularia sp.2
- Arctacellularia sp.3
- Arctacellularia tetragonala
- Arctacellularia varia
- Arctica islandica
- Arctium sp
- Arctium tomentosum
- Arctocephalites elegans
- Arctocephalites nudus
- Arctopteris rarinervis
- Arctostaphyloides
- Arctostaphylos
- Arctostaphylos uva-ursi
- Arctotis lenaensis
- Arctotis sp
- Arctotis typus
- Arcuata
- Arcuatipollenites
- Arcuatipollenites asansoliensis
- Arcuatipollenites damudicus
- Arcuatipollenites diffusus
- Arcuatipollenites noviaulensis
- Arcuatipollenites ovatus
- Arcuatipollenites paliensis
- Arcuatipollenites pellucidus
- Arcuatipollenites sp
- Arcuatipollenites tethysensis
- Arcuatisporites
- Arcuatisporites densoarcuatus