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In the scientific literature, a cephalopod arm is often treated as distinct from a tentacle, though 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. [4]
The hectocotyl arm was first described in Aristotle's biological works. Although Aristotle knew of its use in mating, he was doubtful that a tentacle could deliver sperm. The name hectocotylus was devised by Georges Cuvier , who first found one embedded in the mantle of a female argonaut .
The nematocysts are located throughout the tentacles that radiate downward from the edge of the umbrella dome, and also cover the four or eight oral arms that hang down from the central mouth. Some species, however, are instead filter feeders, using their tentacles to strain plankton from the water.
The hole was big enough that the octopus was able to fit its arm inside and taste the fish with its tentacles. But the hole was too small for the octopus to grab onto and remove the fish to eat it.
Octopodiformes is a superorder of the subclass Coleoidea, comprising the octopuses and the vampire squid.All living members of Octopodiformes have eight arms, either lacking the two tentacles of squid (as is the case in octopuses) or modifying the tentacles into thin filaments (as in vampire squid).
It has a circular body shape and about 240 tentacles. Its most distinctive feature is its bright red, “cross-shaped” stomach. Photos show the St. George’s cross medusa jellyfish in an aquarium.
While arms are distinct from tentacles (a definition specific to the limb featuring peduncles), arms do fall within the general definition of "tentacle" as "a flexible, mobile, and elongated organ" and "tentacle" could be used as an umbrella term. The tentacles of the giant squid and colossal squid have powerful suckers and pointed teeth at the ...
A Zancleopsis grandis, or large Zancleopsis jellyfish, with its body and tentacles pulled together. Photo from Schuchert and Collins (2024) Another photo shows a large Zancleopsis jellyfish with ...