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Opisthoteuthidae are a group of octopuses characterized by a web of skin in between their arms. They broad U-shaped shell that support muscles for a pair of small fins on the mantle, these fins are far less developed than other families in Cirrina and essentially only act as stabilizers when the animal swims (using a medusoid motion of the arms and webbing). [1]
Grimpoteuthis [1] is a genus of pelagic cirrate (finned) octopods known as the dumbo octopuses. [2] The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film Dumbo, having two prominent ear-like fins which extend from the mantle above each eye.
The longitudinal muscles run parallel to the length of the octopus and they are used in order to keep the mantle the same length throughout the jetting process. Given that they are muscles, it can be noted that this means the octopus must actively flex the longitudinal muscles during jetting in order to keep the mantle at a constant length.
The adductor muscles have been cut, the valves are gaping. The internal anatomy is visible, including the paired siphons to the right A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes : Gastropoda , Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails , clams ...
Opisthoteuthis agassizzi octopuses are small compared to most octopuses; males weigh up to four times more than females, and have a mantle length from 1 up to 2 + 1 ⁄ 2 inches. Males suckers are also much larger. The largest specimen, a male, had a mantle (the body not including the octopus' arms) reaching 63 mm, a little under two and a half ...
The common octopus (Octopus vulgaris) is a mollusk belonging to the class Cephalopoda. Octopus vulgaris is one of the most studied of all octopus species, and also one of the most intelligent. It ranges from the eastern Atlantic, extends from the Mediterranean Sea and the southern coast of England , to the southern coast of South Africa.
Diagram of the internal shell structure of the left valve of bivalve resembling a venerid in which the pallial line is shown. The pallial line is a mark (a line) on the interior of each valve of the shell of a bivalve mollusk. This line shows where all of the mantle muscles were attached in life.
The mantle of Cranchia scabra is covered in numerous multi-pointed cartilaginous tubercles Ventral view of an adult Galiteuthis glacialis from the Ross Sea, with a mantle length of 32.1 cm Different cephalopod dermal structures are hypothesised to play roles in buoyancy , locomotion, and even pseudoskeletal support.
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