Physical Characteristics

Has retractile filaments extending from pockets between the dorsal and dorsolateral arms. Fins present. Large circular, lidded photophores present behind each adult fin ("fin-base" organs); numerous small photophores distributed over the lower surfaces of mantle, funnel, head and the aboral surface of the arms and web ("skin-nodule" organs). A gladius, or internal remnant of an original external shell, is present with a broad median field and conus (cup-shaped tip). Cirri are present over the entire length of the arm; suckers lack a cuticular lining and are present only on the outer half of arms.

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