Cephalopoda - definition. What is Cephalopoda
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CLASS OF MOLLUSKS
Cephalopoda; Cephalopods; Cephelapod; Cephalapod; Inkfish; Cephalapoda; Cephelapods; Cephlopod; Cephelopod; Cephalpoda; Reproductive system of cephalopods; Male-male competition in cephalopods; Reproductive behavior of cephalopods; Sexual behavior of cephalopods; Excretory systems of cephalopods; Circulatory systems of cephalopods; Sexual dimorphism in cephalopods
  • An [[ammonoid]] with the body chamber missing, showing the septal surface (especially at right) with its undulating lobes and saddles
  • Various species of [[ammonite]]s
  • The two-part beak of the [[giant squid]], ''Architeuthis'' sp.
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  • alt=Coloured drawing of a huge octopus rising from the sea and attacking a sailing ship's three masts with its spiraling arms
  • A cuttlefish with W-shaped pupils which may help them discriminate colors
  • A fossilised [[belemnite]]
  • ''Gyronaedyceras eryx'', a nautiloid from the [[Devonian]] of [[Wisconsin]]
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  • alt=A mission badge of an octopus spanning the world against a starry background, labelled "NROL-39" and "Nothing is beyond our reach"
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  • The primitive [[nautilus]] eye functions similarly to a [[pinhole camera]].
  • [[Chambered nautilus]] (''Nautilus pompilius'')
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  • Detail of the [[hectocotylus]] of ''[[Ocythoe tuberculata]]''
  • Holotype of ''[[Ostenoteuthis siroi]]'' from family [[Ostenoteuthidae]]
  • Female ''[[Argonauta argo]]'' with eggcase and eggs
  • The W-shaped pupil of the cuttlefish expanding when the lights are turned off
  • [[Common cuttlefish]] (''Sepia officinalis'')
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  • Egg cases laid by a female squid
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  • ''[[Amphioctopus marginatus]]'' eating a crab
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Cephalopoda         
·noun ·pl The highest class of Mollusca.
cephalopod         
['s?f(?)l?(?)p?d, 'k?-]
¦ noun Zoology an active predatory mollusc of the large class Cephalopoda, which comprises octopuses, squids, and cuttlefish.
Origin
from mod. L. Cephalopoda, from Gk kephale 'head' + pous, pod- 'foot'.
Inkfish         
·noun A cuttlefish. ·see Cuttlefish.

ويكيبيديا

Cephalopod

A cephalopod is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδες, kephalópodes; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.

Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by Nautilus and Allonautilus. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites). Extant cephalopods range in size from the 10 mm (0.3 in) Idiosepius thailandicus to the 14 m (45.1 ft) colossal squid, the largest extant invertebrate.