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Though not all species use a hectocotylus; for example, the adult nautilus releases a spadix. [114] Some male squids, mainly deep-water species, have instead evolved a penis longer than their own body length, the longest penis in any free-living animals. It is assumed these males simply attach a spermatophore anywhere on a female's body. [115]
Teuthida— the squid species. Subcategories. This category has the following 6 subcategories, out of 6 total. B. Bathyteuthida (5 P) Bobtail squid (1 C, 84 P) M.
Edible molluscs are harvested from saltwater, freshwater, and the land, and include numerous members of the classes Gastropoda (snails), Bivalvia (clams, scallops, oysters etc.), Cephalopoda (octopus and squid), and Polyplacophora (chitons). Many species of molluscs are eaten worldwide, either cooked or raw.
Magnetoencephalography (MEG), for example, uses measurements from an array of SQUIDs to make inferences about neural activity inside brains. Because SQUIDs can operate at acquisition rates much higher than the highest temporal frequency of interest in the signals emitted by the brain (kHz), MEG achieves good temporal resolution.
The squid lives in the twilight zone during the day, hiding from predators in the darkness. At night, like many other animals that live in the twilight zone, it migrates to more shallow waters in ...
In particular, the Coleoidea subclass (cuttlefish, squid, and octopuses) is thought to be the most intelligent invertebrates and an important example of advanced cognitive evolution in animals, though nautilus intelligence is also a subject of growing interest among zoologists. [4]
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Some species live over 2 km below sea level. The body shape of many species changes drastically between growth stages, and many young examples could be confused for different species altogether. The largest squid in the family Cranchiidae is the colossal squid. [5] Cranchiid squid represent no interest to commercial fisheries.