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Arms and buccal mass of the squid Taningia danae.As in other Octopoteuthidae, the tentacles are absent in adults. Oral view of the bobtail squid Semirossia tenera Head and limbs of the bobtail squid Rossia glaucopis Oral view of male Bathypolypus arcticus with hectocotylus on arm III (left) Cephalopod suckers and configuration of suckers on tentacular club Serrated suckers of a giant squid ...
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]
Though the total number of recorded giant squid specimens now runs into the hundreds, the species remains notoriously elusive and little known. Attempts to capture a glimpse of a live giant squid—described as "the most elusive image in natural history" [44] —were mooted since at least the 1960s. [45]
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By this definition the eight appendages of octopuses, though quite long, count as arms. [2] 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.
Articles relating to the Decapodiformes, a superorder of Cephalopoda comprising all cephalopod species with ten limbs, specifically eight short arms and two long tentacles. Subcategories This category has the following 7 subcategories, out of 7 total.
Search. Appearance. Donate; Create account; Log in; Personal tools. ... Pages in category "Cephalopod zootomy" The following 42 pages are in this category, out of 42 ...
In male seven-arm octopuses (Haliphron atlanticus), the hectocotylus develops in an inconspicuous sac in front of the right eye that gives the male the appearance of having only seven arms. In argonauts , the male transfers the spermatophores to the female by putting its hectocotylus into a cavity in the mantle of the female, called the pallial ...