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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]
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 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 ...
In species where the shell is small compared to the size of the body, more of the mantle shows. Shell-less slugs have the mantle fully visible. The dorsal surface of the mantle is called the notum, while the ventral surface of the mantle is called the hyponotum. In the family Philomycidae, the mantle covers the whole back side of the body. [2]
Callistoctopus rapanui is large and muscular, with a mantle length of up to 115 millimetres (4.5 in) and a total length of up to 550 millimetres (22 in). It has scattered rough tubercles across the body. [5] The arms are 3.5 to 4.5 times the length of the mantle, and have two rows of suckers each.
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.
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 ...
One of the most recent sightings of the glass octopus occurred in 2021, when marine scientists from Boston University captured video of two glass octopuses while aboard the Falkor research vessel. [3] It has a mantle length up to 11 cm (4.3 in) and a total length up to 45 cm (18 in) in adults. The upper three pairs of arms are subequal in ...
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