Roux, MichelPawson, David L.2008-07-242008-07-241999-07Roux M, Pawson DL. 1999. Two new Pacific Ocean species of hyocrinid crinoids (Echinodermata), with comments on presumed giant-dwarf gradients related to seamounts and abyssal plains. Pac Sci 53(3): 289-298.0030-8870http://hdl.handle.net/10125/2187Hyocrinus foelli, n. sp. is a small hyocrinid sea lily from the abyssal ferromanganese nodule fields of the North Pacific Ocean. Hyocrinus giganteus, n. sp. is a very large hyocrinid from Horizon Seamount in the eastern Pacific that shows close affinities to H. cyanae from the western Pacific, off New Caledonia. A possible giant-dwarf heterochronic gradient, related to scarcity of food supply in abyssal plains and its abundance in seamount environments, is discussed.en-USArticle