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Gladius, showing measurement of rachis and vane The gladius ( pl. : gladii ), or pen , is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids ) and in a single extant member of the Octopodiformes , the vampire squid ( Vampyroteuthis infernalis ). [ 1 ]
The same is true of the chitinous gladius of squid [83] and octopuses. [84] Cirrate octopods have arch-shaped cartilaginous fin supports, [85] which are sometimes referred to as a "shell vestige" or "gladius". [86] The Incirrina have either a pair of rod-shaped stylets or no vestige of an internal shell, [87] and some squid also lack a gladius ...
The generic name is derived from the Eromanga Basin in which it was discovered and the Ancient Greek teuthís (τευθίς, 'squid'). [2] One gladius suggests it had a mantle length of 1.2 meters. [2] This makes Eromangateuthis the largest known plesioteuthidid, with a mantle length over twice as long as the second largest, Boreopeltis ifrimae ...
Some of specimens, including gladius remains which has yielded an estimated mantle length close to or equal to that of the modern giant squid, should be classified as specimens of Enchoteuthis melaneae instead. Another species of Tusoteuthis, T. cobbani was also reclassified to genus Enchoteuthis. [1]
Tortoise with cuttlebone Fossil cuttlebone of the Pliocene species Sepia rugulosa Fossilised cuttlebone-like gladius of Trachyteuthis [1]. Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, within the cephalopods.
Decapodiformes is a superorder of Cephalopoda comprising all cephalopod species with ten limbs, specifically eight short arms and two long tentacles.It is hypothesized that the ancestral coleoid had five identical pairs of limbs, and that one branch of descendants evolved a modified arm pair IV to become the Decapodiformes, while another branch of descendants evolved and then eventually lost ...
Coleoidea [1] [2] or Dibranchiata is one of the two subclasses of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e. octopus, squid and cuttlefish).
Helicocranchia pfefferi, the banded piglet squid, is a small squid of the genus Helicocranchia. ... Paddle-shaped fins are attached to a part of the gladius.