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An autonomic response keeps the octopus's eyes oriented so that the pupil is always horizontal. [26] Octopuses may also use the statocyst to hear sound. The common octopus can hear sounds between 400 Hz and 1000 Hz, and hears best at 600 Hz. [61] Octopuses have an excellent somatosensory system.
Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. [1] They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. [2]
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. There are 17 species recognized in the genus. [3] [4]
They have short arms, and lack the 'ears' found in the deep-sea Grimpoteuthis species (nicknamed the Dumbo octopuses). [1] Specimens were observed on footage obtained at depths of 4,290 metres (2.6 miles). It is thought that the females lay their eggs on sea sponges. [1]
This octopus is named for the false eye spot (ocellus) under each real eye. These ocelli are an iridescent blue, chain-link circle, set in a circle of black. On its arms, the octopus possesses many "suckers" that it uses to taste. They have three hearts, two gills, blue blood, and a donut-shaped brain. [5]
They have fins above their eyes, similar to those found on some species of squid. 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]
The creatures are known as dumbo octopuses because of their “large” fins. ‘Cutest octopus in the world’ seen for the first time in Southeast Pacific. See video
Amphioctopus aegina, commonly referred to as the marbled octopus or the sandbird octopus, [2] is a bottom dwelling species residing in the coastal zone of the Indo-West Pacific. [ 3 ] Planktonic hatchlings and eggs are laid by females predominantly during the months of January and October, however they have been known to reproduce year-round.