Caldwell. "The Furcacaudiformes: a new order of jawless vertebrates with thelodont scales, based on articulated Silurian and Devonian fossils from northern
(JANVIER 1996) Sansom, Ivan J.; Smith, Moya M.; Smith, M. Paul. Scales of thelodont and shark-like fishes from the Ordovician of Colorado. Nature. February
Caldwell. "The Furcacaudiformes: a new order of jawless vertebrates with thelodont scales, based on articulated Silurian and Devonian fossils from northern
London: W.B. Saunders. 1970. Turner, S. Early Silurian to Early Devonian thelodont assemblages and their possible ecological significance. A. J. Boucot;