There are around 300 species of octopus and they are found in every ocean. The giant Pacific octopus (Enteroctopus dofleini) is often cited as the largest known octopus species. Perhaps they listen to sound to evade predators and can eavesdrop to sounds made by their prey. This sac-like chamber contains peculiar mineralized components, alongside strands of sensitive hair, which may act like the ones humans have in their inner ears. One surprising fact is that after reproduction, both the female and male die through cellular suicide. The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (156.5 lb). Octopuses (or octopi, if you prefer) are cephalopods, invertebrates that also include squid and cuttlefish. (2003). The largest Dumbo octopus was 1.8 m (6 ft 32in) length and weighed in 5.9 kg … But the find raises the tantalizing possibility that the creatures use auditory input to locate prey, steer clear of predators, and also for communications within the species. Both males and females have an instinctive drive to mate once the age of maturity is attained. [31] Dumbos hover above the sea floor, searching for polychaete worms, pelagic copepods, isopods, amphipods, and other crustaceans for food. “Cephalopod” is Greek for “head-foot,” which makes sense, since their limbs are attached directly to their head. 2020 National Geographic Partners, LLC. The latter spans from about 20Hz to 20,000Hz. [33] Solitary animals, they typically live alone, sometimes in dens they build from rocks, sometimes in shells they pull over on top of themselves. 2. [2] The average life span of various Grimpoteuthis species is 3 to 5 years. Interestingly though, both species hear best at a frequency of 600Hz,” Yan said, quoted by the BBC News. Ears are generally limited to vertebrates. The debate was sparked by the fact that the animals did not have gas-filled chambers like humans, and therefore would have nothing to process the sound waves coming to them with. But humans can also be stupid. Octopus Breeding. Size. Their soft bodies mean octopuses can fit into impossibly small nooks and crannies, as long as the holes are not smaller than the only hard parts of their bodies: their beaks. Most species are 20-30 cm (7.9-12 in) length. [25], Species of Grimpoteuthis face few direct threats from humans, living at depths of 1,000 meters (3,300 ft) and below. [15][12] Several species formerly classified in this genus were moved to other opisthoteuthid genera. (2003). [citation needed], As noted above, many species collected on the Challenger expedition were initially classified in the genera Cirroteuthis and Stauroteuthis. The dumbo octopus has a distinct characteristic, what was once thought to be white spot(s) above their eyes, near the base of the fins is transparent patches. Unlike fish, which can use their air-filled swim bladder to locate the source of a sound, octopuses and squids lack it completely, which suggests that they use other mechanisms to make out sounds. Young, Richard E.; Vecchione, Michael. How many hearts does an octopus have? They have bulbous heads, large eyes, and eight very useful arms. Find out about these and other octopus facts. As such, they lack a sensory system that detects changes in pressure that correspond to sound. Females have a much more prevalent gelatinous body type with size being more width than length, having 1.5 to 2 time more short arms. Octopuses can open clamshells, maneuver rocks—even dismantle the filtration systems of an aquarium tank. The Dumbo octopus is named after Disney’s Dumbo the elephant character, from the eponymous movie, that was famous for its big ears. If a predator gets too close octopuses can escape quickly, shooting themselves forward by expelling water from a muscular tube called a siphon. There are "hearing organs" such as the tympanic membrane in certain invertebrates, but not in the case of the octopus. Other differences include females having broadly U-shaped shells, larger eyes, and gills with six lamellae. 3. Unlike most octopuses, the Dumbo octopus doesn’t have an ink sac because it rarely encounters predators in the deep sea. [24], Species of Grimpoteuthis are assumed to have a worldwide distribution, living in the cold, abyssal depths ranging from 1,000 to 7,000 metres. [4][24] The persistent confusion and disparity about the taxonomy of these species has been attributed to the poor quality and limited number of specimens available for study. [29] Movement of the arms can be used to help the animal move in any direction. “The key question which I would like to investigate is what kind of sounds are they listening to? 14. This enables Disqus, Inc. to process some of your data. [citation needed] A new family, Grimpoteuthididae, has been proposed to accommodate these species and those of genus Enigmatiteuthis. Grimpoteuthis is a genus of pelagic umbrella octopuses known as the dumbo octopuses. In 2020, Grimpoteuthis was spotted ~ 7000m deep down in the Java Trench. Specimens have been found off the coast of Oregon, the Philippines, Martha's Vineyard, the Azores, New Zealand, Australia, California, Gulf of Mexico, Papua, and New Guinea. The research is described in the latest issue of the journal Comparative Biochemistry and Physiology, Part A. [2] The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film Dumbo, having a prominent ear-like fin which extends from the mantle above each eye. This also means that the pressure component of the sound is unknown to these creatures. Octopuses (or octopi, if you prefer) are cephalopods, invertebrates that also include squid and cuttlefish. Prominent ear-like fins protrude from the mantle just above the almost sightless eyes of the octopus. Grimpoteuthis[1] is a genus of pelagic umbrella octopuses known as the dumbo octopuses. Well, starfish do not have ears. “That indicates that squid have a better hearing capability than the octopus. Octopuses are highly intelligent animals, masters of camouflage that have evolved an array of tricks over tens of millions of years to avoid or thwart would-be attackers. Another shot a jet of water at a light to cause a commotion. [34] Females can be distinguished from males by body type. [35], Genus of cephalopods known as the dumbo octopuses, Movement, characteristics and food supply. (2003). [30], Females have no distinct period for breeding. Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft). ", "The marine fauna of New Zealand: Octopoda (Mollusca: Cepahlopoda)", "Deep-water octopods (Mollusca; Cephalopoda) of the northeastern Pacific", "The genus Grimpoteuthis (Octopoda: Grimpoteuthidae) in the north-east Atlantic, with descriptions of three new species", Teuthologische Mitteilungen V. Zwei neue Cirraten-Arten. [28], Specimens of Grimpoteuthis have been observed to swim by using movement of the fins. They’ve also can develop opinions about people; one routinely squirted water down the back of a keeper it seemed to dislike. Therefore, the fins of the Flapjack Octopus distinguish it from the other octopus species. [3] Prey include crustaceans, bivalves, worms and copepods. "First in situ observation of Cephalopoda at hadal depths (Octopoda: Opisthoteuthidae: "SpotMetrics: An Open-Source Image-Analysis Software Plugin for Automatic Chromatophore Detection and Measurement", "Fascinating Facts About Octopuses: Adorable, Dumbo, and Two-Spot", Taxonomy, ecology and behavior of the cirrate octopods, "Dumbo octopod hatchling provides insight into early cirrate life cycle",, Short description is different from Wikidata, Articles with unsourced statements from February 2020, Creative Commons Attribution-ShareAlike License, South Pacific (off New Zealand and Australia), North Pacific (Tufts and Cascadia Abyssal Plains off Oregon), Northeast Atlantic (Porcupine Abyssal Plain), West Pacific (off Meangis Islands, near Philippines), This page was last edited on 17 October 2020, at 04:16. There are 13 species recognized in the genus. Moving these hairs in humans causes a difference of electrical potential in auditory nerves, which is transmitted to the brain and processed into the auditory sensation. Octopuses can also release a cloud of black ink, which obscures them and dulls an encroacher’s sense of smell.

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