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Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two "legs" and six "arms") and two tentacles. [5] The limbs of nautiluses, which number around 90 and lack suckers altogether, are called cirri. [5] [6] [7]
Until the mid-20th century, the "Arms as Head" hypothesis was widely recognized. In this theory, the arms and tentacles of cephalopods look similar to the head appendages of gastropods, suggesting that they might be homologous structures. Cephalopod appendages surround the mouth, so logically they could be derived from embryonic head tissues. [150]
The arms are thick and capable; the fins vary in shape and size, from sagittate and about 50% of the mantle length, to reniform and about 30% of the mantle length. Of moderate size, these squid range in size from 11 to 40 cm—most species are 25 cm or less.
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).
As the nautilus matures, it creates new, larger camerae and moves its growing body into the larger space, sealing the vacated chamber with a new septum. The camerae increase in number from around 4 at the moment of hatching to 30 or more in adults. The shell coloration also keeps the animal cryptic in the water. When seen from above, the shell ...
The remains were found at a dig site in Bascharage in 2022, researchers said in a Feb. 27 news release. The fossil was in “excellent” condition and included the “complete specimen.”. But ...
The colossal squid (Mesonychoteuthis hamiltoni) is the largest squid in the world, growing 33 feet long and weighing 1,000 pounds. According to scientists at MBARI, we have more insight into the ...
Giant squid caught by hook and line off Greymouth, New Zealand, on 16 August 2018 (#657 on this list). It now forms part of the collections of the Auckland War Memorial Museum. This list of giant squid specimens and sightings since 2015 is a timeline of recent human encounters with members of the genus Architeuthis, popularly known as giant squid.