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Mollusk
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Is octopus a fish or a mollusk?
Though it breathes through gills, the octopus is not a fish but a cephalopod marine mollusk. Also, unlike a fish, an octopus is an invertebrate, which means it doesn’t have a backbone. … The octopus is considered a mollusk because it has a mantle that holds the organs it uses for breathing and excretion and has a rasping tongue, or radula.
Is an octopus a cephalopod?
octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods.
Is Octopus an invertebrate or vertebrate?
Also, unlike a fish, an octopus is an invertebrate, which means it doesn’t have a backbone. It also has three hearts. … The octopus is considered a mollusk because it has a mantle that holds the organs it uses for breathing and excretion and has a rasping tongue, or radula.
What is the size of an octopus?
The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods. ( See cephalopod .) Octopuses vary greatly in size: the smallest, O. arborescens, is about 5 cm (2 inches) long, while the largest species may grow to 5.4 metres (18 feet) in length and have an arm span of almost 9 metres (30 feet).