The head contains the brain, eyes, and buccal mass (the beak/mouth and salivary glands) and is located below the mantle. 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. Perception Channels: visual polarized light tactile vibrations chemicalīigfin reef squid possess a characteristic cephalopod body plan that is fusiform in shape, with a large mantle, attached head, and multiple arms. Other Communication Modes: photic/bioluminescent vibrations In addition, bigfin reef squid possess sensitive chemoreceptors near their mouth and on the suckers (more developed in octopi and cuttlefish), which helps to distinguish between prey and non-prey items.Ĭommunication Channels: visual tactile chemical They do not possess any specialized organs for sound detection or production (although vibrations are perceived), instead relying upon their highly developed sense of sight for communication and perception of their environment. Physical intimidation, such as chasing or biting of other individuals, as well as additional visual displays of dominance, such as genital presentation and limb-spreading, have also been observed in shoals and in mating groups. It uses rapid, vivid changes in its body color pattern (via chromatophores) to convey information about potential threats, food sources, or dominance. However, when in close proximity to others, as in feeding groups or breeding shoals, this species does display distinct communication behaviors. Bigfin reef squid are typically solitary, limiting the amount of communication that occurs between individuals.
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