Squid species have complex eyes that are capable of focusing and forming clear images. The head contains the brain, eyes, and buccal mass (the beak/mouth and salivary glands) and is located below the mantle. ( Hanlon and Messenger, 1998 Jackson and Moltschaniwskyj, 2002 Lane, 1960 Sivashanthini, et al., 2010) When fully grown, this small squid can weigh anywhere from 1 pound to 5 pounds. The mantle length is regularly 200-300 mm. The maximum reported mantle length in males is 422 mm and 382 mm in females. The fins extend along over 90% of the length of the mantle and give the squid a characteristic oval appearance. The distinguishing "big fins" referred to in the common name are located on the superior portion of the mantle. The remnant of an ancestral shell is also found within the mantle, and is known as the internal gladis (commonly called the "pen"). The majority of the mantle is made up of the circular muscle fibers. The muscles of the mantle are made of two different types (circular and radial) of fibers that have different orientations. The mantle is a highly muscular organ which surrounds the entire body of the squid. Its main body mass is contained in the mantle (sometimes referred to as the "hood"), where the organs for reproduction, respiration, digestion, circulation, excretion, and propulsion are found. The genus name Sepioteuthis describes its cuttlefish ( Sepia officinalis)-like appearance.
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