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Squids do not have the longitudinal muscles that octopus do. Instead, they have a tunic. [81] This tunic is made of layers of collagen and it surrounds the top and the bottom of the mantle. Because they are made of collagen and not muscle, the tunics are rigid bodies that are much stronger than the muscle counterparts.
Gladius, showing measurement of rachis and vane. The gladius (pl.: gladii), or pen, is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids) and in a single extant member of the Octopodiformes, the vampire squid (Vampyroteuthis infernalis). [1]
The squid's vernacular name arose due to its rich red skin pigmentation and the presence of photophores along its body, making it appear like a strawberry with seeds. [2] H. heteropsis live in the ocean's mesopelagic zone and are found in the California Current and the Humboldt Current. [4]
Sthenoteuthis oualaniensis occurs in a diverse range of environments in the tropical and subtropical Indo-Pacific, often at depths of over 600 m (1,969 ft) deep. [9] [6] [7] Total species biomass has been estimated at between 8-11 million tonnes; the Arabian Sea from November-January is thought to contain one of the highest concentrations (12 to 42 t km −2) of these squids due to population ...
Uroteuthis is a genus of 14 species of common inshore squids of the Indo-West Pacific and is further subdivided into 3 subgenera. The members of the genus Uroteuthis are the only squids of the family Loliginidae that possess photophores (light-emitting organs) and all species in the genus have a pair of photophore organs on the ventral surface of their ink sac either side of their intestine.
Hundreds to thousands of feet below the surface of the ocean, beyond where sunlight can reach, another world exists. It’s called the twilight zone and the animals here vary from microscopic to ...
In a 1990 study of dermal structures in squid, Clyde F. E. Roper and C. C. Lu wrote that they were "unable to suggest a function" for the tubercles of this species, but that due to their small size and spacing they were unlikely to be involved in buoyancy or locomotion. [1]
The males produce spermatophores with a long cement body and they lack a ventral crest on their hectocotylus. Their suckers have square teeth which ring the entire margin or are placed distally. The males do not have enlarged suckers on the left ventral arm. The tentacular club is expanded and contains suckers in four series. [3]