Marine Biological Laboratory LIBRARY PROCEEDINGS NOV 7 1990 OF THE CALIFORNIA ACADEMY OF stlENCElS Hole, Mass. Vol. 47, No. 3, pp. 47-94, 20 figs., 19 tables. October 17, 1990 DEEP-WATER OCTOPODS (MOLLUSCA; CEPHALOPODA) OF THE NORTHEASTERN PACIFIC By Gilbert L. Voss' Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149 and William G. Pearcy College of Oceanography, Oregon State University, Corvallis, Oregon 97331 Abstract: Descriprions and illustrations are given of nine species of Octopoda from depths of 1,000 m to 4,000 m off the coast of Oregon. Eight are new: Grimpoteuthis bathynectes, G. tuftsi, Benthoctopus robustus, B. canthylus, B. oregonensis. B. yaquinae, B. macrophallus, and Graneledone pacifica. Four genera are treated: Cirroteuthis and Grimpoteuthis of the Cirrata and Benthoctopus and Graneledone of the Incirrata. Cirroteuthis muelleri is first recorded from the Pacific Ocean and is redescribed. The genus Benthoctopus in the North Pacific is discussed and a provisional key for the nine recognized species is provided. The variability and form of the radula of Graneledone are considered to be due to degeneracy and not primitiveness, and to lack of selective feeding pressure. Received August 21, 1989. Accepted March 14, 1990. Introduction The deep-water octopod fauna of the north-eastern Pacific below 2,000 m is poorly known. Little research on the systematics of deep-sea octopods has been completed since Robson's (1932) monograph, with the exception of Voss's (1976) partial revision o^ Graneledone. Two re-cent papers, however, provide important reviews of the evolution, phylogeny, and biogeography of deep-sea octopods and relevant background for this paper (see Voss 1988a, b). Deceased January 23, 1989. The present paper is based on a unique col-lection of about 90 specimens of deep-water oc-topods, all from the continental slope and two abyssal plains off the Oregon coast. The speci-mens were collected by the ships CAYUSE, ACONA and YAQUINA of Oregon State Uni-versity (OSU) in depths from 1,000 to nearly 4,000 m, with most of the material from depths in excess of 2,500 m. Most of the specimens belong to new species in the genera Grimpoteu-this and Benthoctopus, with the largest series of specimens in the genus Graneledone. All three of these poorly known genera consist of a large number of species, most of which were inade-[47]
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