Paleontology
- 201
 - Discovery of a Transitional in Romer's Gap
 - Article on the discovery in 2002 of a tetrapod fossil, Pederpes finneyae, which seems to fill the gap between the very earliest and later tetrapods.
 
- 202
 - Eucritta melanolimnetes
 - Description of this early tetrapod, photograph of its fossil remains, and a reconstruction of its skeleton provided by the Tree of Life Web Project.
 
- 205
 - Creatures from the Black Lagoon
 - Information from the BBC on the discovery of a fossil of Eucritta melanolimnetes in a limestone wall in Scotland and the ensuing discoveries in the Black Lagoon from which the stone had come. (December 21, 2000)
 
- 206
 - Devonian Times
 - An educational site covering the early evolution of tetrapods by focusing on the flora and fauna of the Late Devonian Red Hill locality in Pennsylvania.
 
- 207
 - Fish Fossils
 - Posting from the TalkOrigins Archive on the controversy surrounding Coelacanth fossils.
 
- 208
 - Fossil Fish
 - images of some Eocene fish from the Green River Formation, a Cretaceous fish, Xiphactinus, from the Niobrara chalk in Kansas and the jaws of the world’s largest fossil shark.
 
- 209
 - Mesozoic Fishes
 - Devoted to fossil fishes from the Mesozoic Era, and to the researchers around the world who study them.
 
- 211
 - Main Groups of Non-Therian Mammals
 - This is Mikko Haaramo's private archive of various phylogenetic trees, starting at Mammaliaformes.
 
- 212
 - Paleocene Mammals of the World
 - Provides comprehensive information on the mammals that came to occupy the vacant ecological niche left by the departure of the dinosaurs.
 
- 213
 - Paleocene Mammals of the World: Condylarths
 - Information on this group of relatively unspecialized placental mammals that were to evolve into the ungulates that dominated the Cenozoic animal communities on land.
 
- 214
 - Transitional Vertebrate Fossils FAQ
 - A lengthy but incomplete list of transitional vertebrate fossils that have been discovered.
 
- 215
 - A Bibliography of Early Papers on North American Plesiosaurs
 - Collection of links to a chronological sequence of papers published between 1851 and 1868, on the discovery, naming, reconstruction and subsequent controversy regarding American plesiosaurs.
 
- 217
 - Aquatic Reptiles
 - The Natural History Museum supplies illustrations of Kronosaurus, Liopleurodon, Rhomaleosaurus, Macroplata, Ophthalmosaurus, Shonisaurus and Temnodontosaurus, with brief facts about each.
 
