Females larger than males in some species, and dwarf males occur; Sexual Dimorphism in many skeletal characteristics such as the number and size of disk scales, the number and length of arm spines and length of genital papillae.
Based on studies in: USA: California, Southern California (Marine, Sublittoral) USA, Northeastern US contintental shelf (Coastal) Puerto Rico, Puerto Rico-Virgin Islands shelf (Reef)
This list may not be complete but is based on published studies.
T. A. Clark, A. O. Flechsig, R. W. Grigg, Ecological studies during Project Sealab II, Science 157(3795):1381-1389, from p. 1384 (1967).
Link J (2002) Does food web theory work for marine ecosystems? Mar Ecol Prog Ser 230:19
Opitz S (1996) Trophic interactions in Caribbean coral reefs. ICLARM Tech Rep 43, Manila, Philippines
Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 16, 2011 at http://animaldiversity.org. http://www.animaldiversity.org