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Cephalopod beak. The beak of a giant squid. All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. [1] [2] The beak may also be referred to as the ...
The two-part beak of the giant squid, Architeuthis sp. All living cephalopods have a two-part beak; [8]: 7 most have a radula, although it is reduced in most octopus and absent altogether in Spirula. [8]: 7 [94]: 110 They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it. [21]
Cephalopod size. The giant squid ( Architeuthis dux, pictured) was for a long time thought to be the largest extant cephalopod. It is now known that the colossal squid ( Mesonychoteuthis hamiltoni) attains an even greater maximum size. The giant squid seen here measured 9.24 m (30.3 ft) in total length and had a mantle length of 1.79 m (5.9 ft).
Octopus. An octopus ( pl.: octopuses or octopodes[ a]) is a soft-bodied, eight-limbed mollusc of the order Octopoda ( / ɒkˈtɒpədə /, ok-TOP-ə-də[ 3] ). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric ...
Cephalopod limb. Arms and buccal mass of the squid Taningia danae. As in other Octopoteuthidae, the tentacles are absent in adults. All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles.
The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. [ 1] The class developed during the middle Cambrian, and underwent pulses of diversification during the Ordovician period [ 2] to become diverse and dominant in the Paleozoic and Mesozoic seas. Small shelly fossils such as Tommotia were once ...
The giant Pacific octopus ( Enteroctopus dofleini ), also known as the North Pacific giant octopus, is a large marine cephalopod belonging to the genus Enteroctopus and Enteroctopodidae family. Its spatial distribution encompasses much of the coastal North Pacific, from the Mexican state of Baja California, north along the United States' West ...
The jaw angle is curved and indistinct. Beaks have a sharp shoulder, which may or may not have posterior and anterior parts at different slopes. The hood lacks a notch and is very broad, flat, and low. The hood to crest ratio (f/g) is approximately 2–2.4. The lateral wall of the beak has no notch near the wide crest.