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The majority of cephalopods do not provide parental care ... females grow 10,000 to 40,000 times larger than the males and the sex ratio between males and females can ...
Paralarvae (sg.: paralarva) are young cephalopods in the planktonic stages between hatchling and subadult. This stage differs from the larval stage of animals that undergo true metamorphosis. [1] Paralarvae have been observed only in members of the orders Octopoda and Teuthida. [2] The term was introduced by Richard E. Young and Robert F ...
The lifespan of nautiluses may exceed 20 years, which is exceptionally lengthy for a cephalopod, many of whom live less than three even in captivity and under ideal living conditions. [37] However, nautiluses typically do not reach sexual maturity until they are about 15 years old, limiting their reproductive lifespan to often less than five years.
The cephalopods were once thought to have evolved from a monoplacophoran-like ancestor [8] with a curved, tapering shell, [9] and to be closely related to the gastropods (snails). [10] The similarity of the early shelled cephalopod Plectronoceras to some gastropods was used to support this view.
The hemolymph, pericardial fluid and urine of cephalopods, including the common octopus, are all isosmotic with each other, as well as with the surrounding sea water. [36] It has been suggested that cephalopods do not osmoregulate , which would indicate that they are conformers. [ 36 ]
In a broad sense, "nautiloid" refers to a major cephalopod subclass or collection of subclasses (Nautiloidea sensu lato). Nautiloids are typically considered one of three main groups of cephalopods, along with the extinct ammonoids (ammonites) and living coleoids (such as squid, octopus, and kin).
Where Does the Strawberry Squid Live? During the day the strawberry squid swims around in the twilight zone of the Atlantic Ocean in a range of about 660 to 3,300 feet below the surface. It can be ...
The largest cephalopod specimen ever recorded: a 495 kg (1,091 lb) colossal squid. Squids are the largest living cephalopods in terms of each of mantle length, total length, and mass, with the largest species by at least two of these measures being the colossal squid, Mesonychoteuthis hamiltoni.