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The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusk's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually ...
[29] [30] The mantle cavity has muscular walls and contains the gills; it is connected to the exterior by a funnel or siphon. [26] [31] The mouth of an octopus, located underneath the arms, has a sharp hard beak. [30] Diagram of octopus from side, with gills, funnel, eye, ocellus (eyespot), web, arms, suckers, hectocotylus and ligula labelled.
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.
The Caribbean reef octopus has also been known to learn from others of the same species and some have disguised themselves as algae or coconuts to avoid predatory detection. This octopus, while not considered very aggressive, will show cannibalistic qualities if individuals are kept too close to one another in captivity.
The thin-walled mantle of the wunderpus has weak musculature and wide aperture. [5] The head has a distinct neck area and is Y-shaped with the eye on each branch of the 'Y'. The head of a male wunderpus is wider than its mantle and for female wunderpus, their mantle is wider than their head. For females, this is due to the large ovary in their ...
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 ...
Their maximum size is 20 cm (7.9 in) mantle length. [5] They have eight arms (like any other octopus), but these affixed together in an umbrella shape. [ 6 ] However unlike other octopus, they are unable to camouflage by changing skin color and texture. [ 7 ]