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Abyormenite - Hal Clement's Cycle of Fire (1957)

Athshean - Ursula K. LeGuin's The Word for World is Forest (1975)

Black Cloud (species) - Fred Hoyle's The Black Cloud

Chulplex - Avram Davidson's Masters of the Maze

Cinruss - James White's Sector General series

Cryer - Joseph Green's Conscience Interplanetary

Cygnan - Donald Moffitt's The Jupiter Theft

Cygnostik - Michael Bishop's A Little Knowledge (1977)

Czill - Jack L. Chalker's Well World series

Demon (species) - Keith Laumer's A Plague of Demons (1977)

Demu (species) - F. M. Busby's To Cage a Man (1973)

Dextran (species) - David J. Lake's The Right Hand of Dextra

Dilbian - Gordon R. Dickson's Spacial Delivery and Spacepaw

Dirdir - Jack Vance's Planet of Adventure series

Garnishee (species) - Harry Harrison's Star Smashers of the Galaxy Rangers

Gowachin - Frank Herbert's Whipping Star and The Dosadi Experiment

Guild Steersman - Frank Herbert's Dune

Ishtarian - Poul Anderson's Fire Time (1974)

Ixchel (species) - Madeleine L'Engle's A Wrinkle in Time

Ixtl - A. E. Van Vogt's The Voyage of the Space Beagle

Lithian - James Blish's A Case of Conscience

Masters - John Christopher's The Tripods trilogy

Medusan - Jack Williamson's The Legion of Space

Merseian - Poul Anderson's Ensign Flandry

Mesklinite - Mission of Gravity

Mother (species) - Philip José Farmer's Strange Relations

Old Galactic - James H. Schmitz's Legacy

Old One - H. P. Lovecraft's At the Mountains of Madness

Overlord (species) - Arthur C. Clarke's Childhood's End

Pnume - Jack Vance's Planet of Adventure series

Polarian - Piers Anthony's Cluster series

Pierson's Puppeteer - Known Space series

Radiate (species) - Naomi Mitchison's Memoirs of a Spacewoman

Regul - C.J. Cherryh's The Faded Sun: Kesrith

Riim - A. E. Van Vogt's The Voyage of the Space Beagle

Ruml - Gordon R. Dickson's The Alien Way

Salaman - Brian Stableford's Wildeblood's Empire

Sirian - Frederik Pohl's The Age of the Pussyfoot

Slash (species) - Piers Anthony's Kirlian Quest

Soft One - Isaac Asimov's The Gods Themselves

Solaris - Stanislaw Lem's Solaris

Sulidor - Robert Silverberg's Downward to the Earth

Terran

The Thing - John W. Campbell's "Who Goes There?"

Thrint - Larry Niven's Known Space series

Tran (species) - Alan Dean Foster's Icerigger

Triped (species) - Damon Knight's Rule Golden

Tyreean - James Tiptree's Up the Walls of the World

Uchjinian - Jack L. Chalker's Well World series

Vegan (species) - Robert A. Heinlein's Have Spacesuit, Will Travel

Velantian - E. E. Smith's Lensman series