Search results
Results From The WOW.Com Content Network
An octopus (pl.: octopuses or octopodes [a]) is a soft-bodied, ... In some species, the mantle can take on the spiky appearance of algae; in others, skin anatomy is ...
Common octopus in the Aquarium of Seville, Spain O. vulgaris from the Mediterranean Sea Common octopus, Staatliches Museum für Naturkunde Karlsruhe, Germany Common octopus of Portugal Common octopus near Crete. Octopus vulgaris grows to 25 cm (10 inches) in mantle length with arms up to 1 m (3.3 feet) long. [3]
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 ...
In addition, tunics take up only 1% of the squid mantle's wall thickness, whereas the longitudinal muscle fibers take up to 20% of the mantle wall thickness in octopuses. [81] Also because of the rigidity of the tunic, the radial muscles in squid can contract more forcefully. The mantle is not the only place where squids have collagen.
Water enters the mantle cavity around the sides of the funnel, and subsequent contraction of the hyponome expands and then contracts, expelling a jet of water. In most cephalopods, such as octopus , squid , and cuttlefish , the hyponome is a muscular tube.
The mantle cavity, a fold in the mantle, encloses a significant amount of space. ... The blue-ringed octopus's rings are a warning signal; this octopus is alarmed ...
During reproduction, the male octopus deposits a spermatophore (or sperm packet) more than 1 m (3.3 ft) long using his hectocotylus (specialized arm) in the female's mantle. The hectocotylus is found on the third arm of male octopuses and occupies the last four inches of the arm. [39]
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]