of aistopods: References Benton, M. J. (2000), Vertebrate Paleontology, 2nd ed. Blackwell Science Ltd Carroll, RL (1988), Vertebrate Paleontology and Evolution, WH Freeman & Co. pp. 176–7 Reisz, Robert Biology 356 - Major Features of Vertebrate Evolution (online) von Zittel, K.A (1932), Textbook of Paleontology, CR Eastman (transl. and ed), 2nd edition, vol.2, p. 221-2, Macmillan & Co. External links Aïstopoda - Palaeos Aistopoda - phylogeny Prehistoric animal orders Aistopods