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common name applied to cephalopod mollusks that have 10 tentacles, or arms, 8 of which have muscular suction cups on their inner surface and 2 that are longer and can shoot out for grasping prey, and a reduced internal shell enbedded in the enveloping mantle. The body is short, broad, and flattened. Cuttlefish are carnivorous and excellent at capturing prey with their arms.

Although good swimmers, they are not as fast as the related squidssquid,
carnivorous marine cephalopod mollusk. The squid is one of the most highly developed invertebrates, well adapted to its active, predatory life. The characteristic molluscan shell is reduced to a horny plate shaped like a quill pen and buried under the mantle.
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, but like the squids cuttlefish have lateral fins used as stabilizers and for steering and propulsion. They swim by jet propulsion, forcibly expelling water through a siphon. During the day they lie hidden at the bottom of the ocean; at night they swim and hunt for food.

Except for the squid genus Loligo, cuttlefish have the best cephalopod eyes, which are highly complex. When disturbed, cuttlefish eject a cloud of dark brown ink from an ink sac for protection. The ink gland and ink sac are specializations of the rectal gland. The ink is composed mostly of melanin and has been used as the artist's pigment, sepia. All cuttlefish are dioecious, i.e., the sexes are separate.

The common, or common European, cuttlefish, Sepia officinalis, possesses an internal shell composed of lime, which is popularly called cuttlebone. Within the narrow spaces between the thin septa of the shell are fluid and gas (mostly nitrogen), which give the organism buoyancy. These cuttlefish are found in the Mediterranean and E Atlantic. The cuttlebone is used for pet birds as a source of lime salts. Sepia are able to undergo a complex of color changes ranging from pink to brown with varying stripes and spots, which they display when they are signaling or are disturbed; they also can change color and texture to camouflage themselves. The eggs, deposited singly and attached by a stalk to objects on the ocean bottom, are extremely large, up to .6 in. (15 mm) in diameter. Cuttlefish are classified in the phylum MolluscaMollusca
, taxonomic name for the one of the largest phyla of invertebrate animals (Arthropoda is the largest) comprising more than 50,000 living mollusk species and about 35,000 fossil species dating back to the Cambrian period.
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, class Cephalopoda, order Sepiida.

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(invertebrate zoology)
An Old World decapod mollusk of the genus Sepia; shells are used to manufacture dentifrices and cosmetics.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


any cephalopod mollusc of the genus Sepia and related genera, which occur near the bottom of inshore waters and have a broad flattened body: order Decapoda (decapods)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
This study demonstrates that water temperature has a significant effect on digestive enzyme activities in common Chinese cuttlefish. The main digestive enzymes activities decreased dramatically at low temperature (16[degrees]C), and significantly increased with increasing temperature from 16-28[degrees]C.
The post Batch of cuttlefish recalled after excessive cadmium found appeared first on Cyprus Mail .
Zheng (2001) showed that there were significant differences in radular structure among nine species of cuttlefish and suggested that radular morphology is informative for their taxonomy.
For fishermen to benefit from this peak season, certain guidelines must be met to protect cuttlefish. "First of all, the fisherman and the boat must be licenced," said Al Subhi, adding that fishermen must not use equipment that would harm the marine species, such as spearfish guns and nylon nets.
Therefore, we examined the stimuli that can elicit tentacular strike behavior of pharaoh cuttlefish, Sepia pharaonis, by using behavioral tests.
Cuttlefish are consumed as food --dried cuttlefish is a common snack in countries in East Asia.
David Drewry of the REED NCFE partnership at Loughborough College added: "David has been demonstrating a fantastic mindset alongside utilising his skills and this has resulted in some excellent work at Cuttlefish."
For the octopus and cuttlefish, instantaneously changing their skin color and pattern to disappear into the environment is just part of their camouflage prowess.
Pizzas on offer include the capricciosa (turkey ham, artichoke, olives and mushrooms), pescato di mare (prawns, calamari, mussels, cuttlefish and octopus), etna (beef pepperoni, chilli flakes and onions), the vegetarian (grilled courgette, aubergine, onion, bell peppers and mushroom), and more.
Dive with giant Australian cuttlefish:Ohh what fun it must be being one of them between them.
While researching the limits of polarised vision of octopuses and cuttlefish, Dr Temple realised that he could see the outline of the polarised images that he was presenting to cephalopods on a specially modified LCD screen.
Called Stubby squid, or Rossa Pacifica, the squid resembles more of a cuttlefish than a common squid found splashing in the Northern Pacific region of Japan and southern California.