All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostatshave been variously termed arms, 2000 Suckers 8 Tentacles - Pierre Henry - The Secret Love Life Of The Octopus or tentacles.
In the scientific literature, a Drums Og Burkina - Mburu - Café Afrique LQuest arm is often treated as distinct from a tentaclethough the terms are sometimes used interchangeably, often with the latter acting as an umbrella term for cephalopod limbs.
Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends. The tentacles of Decapodiformes are thought to be derived from the fourth arm pair of the ancestral coleoidbut the term arms IV is used to refer to the subsequent, ventral arm pair in modern animals 2000 Suckers 8 Tentacles - Pierre Henry - The Secret Love Life Of The Octopus is evolutionarily the fifth arm pair. The males of most cephalopods develop a specialised arm for sperm delivery, the hectocotylus.
Anatomically, cephalopod limbs function using a crosshatch of helical collagen fibres in opposition to internal muscular hydrostatic pressure. Cephalopod limbs bear numerous suckers along Back To Your Heart - Backstreet Boys - Millennium ventral surface as in octopussquid and cuttlefish arms, or in clusters at the ends of the tentacles, as in squid and cuttlefish.
Both of these structures are thick muscles, and are covered with a chitinous cuticle to make a protective surface. When a sucker attaches itself to an object, the infundibulum mainly provides adhesion while the central acetabulum is free. Sequential muscle contraction of Media - Ismo Alanko Säätiö - Pulu / Sisäinen Solarium infundibulum and acetabulum causes attachment and detachment.
Many octopus arm anomalies have been recorded,   including a 6-armed octopus nicknamed Henry the Hexapusa 7-armed octopus,  a armed Octopus briareus one with a forked arm tip,  octopuses with double or bilateral hectocotylization  and specimens with up to 96 arm branches.
Branched arms and other limb abnormalities have also been recorded in cuttlefish squid and bobtail squid. Cephalopod limbs and the suckers 2000 Suckers 8 Tentacles - Pierre Henry - The Secret Love Life Of The Octopus bear are shaped in many distinctive ways, and vary considerably between species.
Some examples are shown below. For hectocotylized arms see hectocotylus variability. From Wikipedia, the free encyclopedia. Arm of Illex illecebrosus with two rows of suckers along its length. Tentacle of Illex illecebrosus with a distal tentacular club right. The Telegraph.
Retrieved 30 July To most of us it has always seemed obvious that an octopus has eight arms. Octopuses have two legs and six arms Claire Little, a marine expert from the Weymouth Sea Life Centre in Dorset, said: 'We've found that octopuses effectively have six arms and two legs. August Journal of Comparative Psychology. Retrieved July 30, London: Faber and Faber.
As result, marine biologists tend to refer to them as animals with two legs and six arms. Mangold Cephalopoda Glossary. Tree of Life web project. Cephalopods: A World Guide. ConchBooks, Hackenheim. The numerous limbs of nautiluses are called tentacles. The ring of eight limbs around the mouth in cuttlefish, squids and octopuses are called arms. Cuttlefish and squid also have a pair of specialised limbs attached between the bases of the third and fourth arm pairs [ These are known as feeding tentacles and are used to shoot out and grab prey.
Histology of the long digital tentacles. In: W. Landman eds. Springer Netherlands. Archived from the original PDF on Retrieved Deep Intuition, LLC. Integr Comp Biol. Archived from the original on Journal of Molluscan Studies. Both tips were fully functional. Journal of Zoology. The Nautilus 99— Proceedings of the Japan Academy.
Pink TentacleJuly 18, Annotated Zoology of Japan. Canadian Journal of Zoology. Cephalopod anatomy. Dermal structures Fins wings Flotation devices "secondary fins" Funnel—mantle locking apparatus Tail. Branchial hearts Ctenidia gills Hepatopancreas digestive gland Ink sac and ink Mental Crush - Angry Planter sac Nephridia "kidneys" Nidamental glands Osphradium Pericardial glands.
Aptychus Beak Odontophore Radula Spadix and antispadix. Nuchal crest occipital crest Nuchal folds occipital folds Occipital membrane Olfactory organ Nuchal organ. Eyes Statocysts. Chromatophores Photophores Nervous system Blueshift - Various - The Visitor (Cassette, MP3) giant axon Squid giant synapse.
Categories : Cephalopod zootomy. Hidden categories: All articles with dead external links Articles with dead external links from November Articles with permanently dead external links Articles with dead external links from November All articles lacking reliable references Articles lacking reliable references from November Namespaces Article Talk.
Berryteuthis magister. Idioteuthis cordiformis. Mastigoteuthis glaukopis. Spirula spirula. Idioteuthis latipinna. Magnapinna talismani. Mastigoteuthis agassizii. Mastigoteuthis atlantica.
Mastigoteuthis dentata. Mastigoteuthis grimaldii. Mastigoteuthis magna. External anatomy Dermal structures Fins wings Flotation devices "secondary fins" Funnel—mantle locking apparatus Tail.
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