Arms eight or (inclusive of the tentacles when present) ten in number; furnished with longitudinal rows of acetabular or suckers along their inner surfaces. Funnel a closed tube. Normally but a single pair each of ctenidia and renal organs present. Visceral mass naked; shell much reduced and embedded in the tissues of the mantle, frequently absent. Eyes highly developed and with closed cavities; a crystalline lens present. Characteristic and intricately constructed dermal pigment cells called "chromatophores" are developed in the integument.This order includes all living cephalopods except Nautilus.Suborder OCTOPODA Leach 18 17. Octopia + Argonautea Rafinesque 1815, p. 139 (fide Binney and Tryon, p. 14).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.