Books and Print Media
-Dougal Dixon: The New Dinosaurs , After Man , Man After Man
Dixon's post-human work for Omni magazine
-Wayne Barlowe: Expedition, Inferno, Alien Life of Wayne Barlowe
Unpublished sketches of future humans.
-H. P. Lovecraft (various short stories and novellas)
-H. G. Wells: The Time Machine (earliest portrayal of future human evolution?)
-Kurt Vonnegut: Galapagos
-Steven Baxter: Evolution
-Colin Caket: Model A Monster-- a craft book that ends with a strange future-evolution tale
-Bruce McClish and Ruth Berry: The Time-Traveller's Guide to Future Australia-- synopsis
-Marc Boulay and Sebastian Steyer: Demain, Les Animaux du Futur
Alternate evolution (including "speculative paleontology" and "lost world" stories):
-Douglas Mawson: Bathybia. Short story about a tropical basin at the South Pole; includes descriptions of giant invertebrates living in forests of algae and fungi. Available online.
-Mike Magee: Who Lies Sleeping?
Rare book about the evolution of "anthroposaurs," humanoid troodonts that develop nuclear power and bring about the Cretaceous extinction. Summary.
-Peter Dickinson: The Flight of Dragons. Imagines dragons as ballonts that produce hydrogen from consumed minerals in order to fly, and breathe fire as a means of expelling excess gas.
-Paul and Karin Johnsgard: Dragons and Unicorns: A Natural History. Another evolutionary take on mythical creatures, depicting dragons as a lineage of ornithiscians.
-Peter Jackson: The World of Kong: A Natural History of Skull Island.
Xenobiology (including alternate dimensions):
-Terryl Whitlatch and Bob Carrau: The Wildlife of Star Wars: A Field Guide
-Terence Dickinson and Adolf Schaller: Extraterrestrials: A Field Guide for Earthlings-- summary
-A. K. Dewdney: The Planiverse. Biological description of two-dimensional life.
-Robert L. Forward: Dragon's Egg and Starquake. Life on a neutron star
Joke spec (speculative creatures not meant to be taken seriously or to be remotely plausible):
-Gerolf Steiner: The Snouters: Form and Life of the Rhinogrades.
--The book Stumpke's Rhinogradentia features earlier illustrations of fictional animals by Steiner.
-Tom Weller: Science Made Stupid. Includes illustrations and descriptions of absurd imaginary prehistoric creatures. Available online.
-Rick Meyerowitz: Dodosaurs. More comic imaginary dinosaurs. Some scans available online.
-Ben Sill, Cathryn P. Sill, and John Sill: A Field Guide to Little-Known and Seldom-Seen Birds of North America; Another Field Guide to Little-Known and Seldom-Seen Birds of North America; Beyond Birdwatching. A trio of parody birding books featuring absurd fictional birds.