The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 1943 births (1 member)
- 2009 in paleontology (3 members)
- Abelisaurids (22 members)
- Ac (1 member)
- Acanthodii (4 members)
- Acanthothoracids (1 member)
- Actinopterygii stubs (9 members)
- Aetiocetidae (1 member)
- Aetosaurs (26 members)
- Africa (26 members)
- Aglaspidida (1 member)
- Agnostida (1 member)
- Akeridae (1 member)
- Alabama (2 members)
- Alaska (1 member)
- Alexornithiformes (1 member)
- Algae (2 members)
- Algeria (1 member)
- Allen Formation (1 member)
- Alligatoridae (15 members)
- Allosaurids (8 members)
- Allosauroids (10 members)
- Alvarezsaurids (11 members)
- Amarganios (1 member)
- American Museum of Natural History (1 member)
- American anthropologists (1 member)
- American geologists (4 members)
- American paleontologists (76 members)
- Amherst College (1 member)
- Amiiformes (3 members)
- Ammonite stubs (859 members)
- Ammonites (944 members)
- Ammonites of Asia (1 member)
- Ammonites of Europe (12 members)
- Ammonites of North America (7 members)
- Ammonites of South America (2 members)
- Ammonites sorted by taxa (6 members)
- Ammonitida (16 members)
- Amphibian stubs (113 members)
- Amphibians (29 members)
- Anaspida (1 member)
- Anatomy (43 members)
- Angiosperms (1 member)
- Animal anatomy (26 members)
- Animal physiology (1 member)
- Animal templates (1 member)
- Animals (13 members)
- Animals described in 2007 (16 members)
- Animals of North America (0 members)