Cirroctopus hochbergi, a species found off New Zealand, is endangered because its population size is low and its habitat has been damaged by trawling. Octopus filamentosus Blainville, 1826 (taxon inquirendum). The female octopus looks exactly like a blanket. Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft).  Octopuses have eight limbs like other coleoids but lack the extra specialised feeding appendages known as tentacles which are longer and thinner with suckers only at their club-like ends. This tiny pink octopus could one day be named Opisthoteuthis adorabilis. In spite of its lethal punch of toxin, the Blue-Ringed Octopus can be found in the aquariums of some enthusiasts. The smallest octopus is the Octopus wolfi. Some have even called the Dumbo Octopus the cutest octopus species of them all. When they can’t do that because of a very hard shell they will release a toxin from glands in their body. Jetting is used to escape from danger, but is physiologically inefficient, requiring a mantle pressure so high as to stop the heart from beating, resulting in a progressive oxygen deficit. , When octopuses reproduce, the male uses a specialised arm called a hectocotylus to transfer spermatophores (packets of sperm) from the terminal organ of the reproductive tract (the cephalopod "penis") into the female's mantle cavity. However, they are virtually harmless to humans and have no desire to be in confrontations. )", "Ask an expert: Are there any freshwater cephalopods?  A gram-negative bacterium, Vibrio lentus, has been found to cause skin lesions, exposure of muscle and death of octopuses in extreme cases.  The arms and sometimes other body parts are prepared in various ways, often varying by species or geography. Octopuses have powerful jaws and venomous saliva, according to National Geographic. , In 2005, Adopus aculeatus and veined octopus (Amphioctopus marginatus) were found to walk on two arms, while at the same time mimicking plant matter. They are well known to be very intelligent animals though. There is plenty of misunderstanding out there about these animals. They are said to be waiting for ships to destroy and men to drag under the water to kill. part of "Cirromorphida" (Cirroteuthidae, Stauroteuthidae), part of "Argonautoidea" (Argonautidae, Ocythoidae), part of "Argonautoidea" (Tremoctopodidae, Alloposidae), part of "Cirromorphida" (Opisthoteuthidae, Cirroctopodidae), Octopuses and other coleoid cephalopods are capable of greater RNA editing (which involves changes to the nucleic acid sequence of the primary transcript of RNA molecules) than any other organisms. Octopus SensesRead Or Listen To The Article Click Here. In fact, they are among the smallest species of octopus anywhere in the world, weighing only one ounce as an adult. , Fowler's Modern English Usage states that the only acceptable plural in English is "octopuses", that "octopi" is misconceived, and "octopodes" pedantic; the latter is nonetheless used frequently enough to be acknowledged by the descriptivist Merriam-Webster 11th Collegiate Dictionary and Webster's New World College Dictionary. , Some robotics research is exploring biomimicry of octopus features. It lives near the shore and has a “classical” octopus shape in terms of the proportion and shape of its head and arms. Octopus bimaculatus Verrill, 1883– California two-spot octopus or Verrill’s two-spot octopus.  Lacking skeletal support, the arms work as muscular hydrostats and contain longitudinal, transverse and circular muscles around a central axial nerve. , Octopuses have a relatively short life expectancy; some species live for as little as six months. The Dumbo Octopus measures 8 to 12 inches in length although some specimens have reached a size of six feet in length. , Some species differ in form from the typical octopus body shape. Another unique feature about the Blue-Ringed Octopus is that it is inkless.  Octopus reproductive organs mature due to the hormonal influence of the optic gland but result in the inactivation of their digestive glands, typically causing the octopus to die from starvation. When scared, octopuses will shoot a dark liquid, sometimes called ink, at the thing that scared them. Octopus longispadiceus (Sasaki, 1917) (taxon inquirendum). This colorful species is named as such because of the distinctive blue-colored rings around its body, it measures between 5 to 8-inches and as beautiful as it is, it is not the friendliest of creatures.  Octopuses are mostly soft tissue, and so fossils are relatively rare. The Portal of Life on Earth, Biodiversity, Animal Facts, Octopus Facts and Information Welcome to the Cephalopod Univers. Researchers have identified impressions of eight arms, two eyes, and possibly an ink sac. , Octopuses also have an excellent sense of touch. Jet propulsion or backwards swimming, is their fastest means of locomotion, followed by swimming and crawling. , Attached to the brain are two special organs called statocysts (sac-like structures containing a mineralised mass and sensitive hairs), that allow the octopus to sense the orientation of its body. , During osmoregulation, fluid is added to the pericardia of the branchial hearts. Young octopuses learn nothing from their parents, as adults provide no parental care beyond tending to their eggs until the young octopuses hatch. Octopus australis Hoyle, 1885– hammer octopus. Octopus briareus Robson, 1929– Caribbean reef octopus. Can you just imagine the difference between male and females? The Atlantic Pygmy Octopus is often misclassified by some as the smallest octopus species. , Cirrate octopuses cannot produce jet propulsion and rely on their fins for swimming. It is able to grasp objects such as a metal tube, a magazine, or a ball, and to fill a glass by pouring water from a bottle. Blue-Ringed Octopus: The Blue-ringed octopuses are four closely related species that live in pools and are mainly found in the Western Pacific, particularly in Australia. Through observation and research, it is known that they are all very intelligent creatures.  Around 300 species are recognised, and the order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. – Machine washable. Remember, all octopi are excellent escape artists, with even larger 25-pound species managing to squeeze through openings no more than three inches in diameter. 11.There are over 300 different species of octopi. The Opisthoteuthis adorabilis’ arms are very short and have webbing in between each one. The Most Mysterious Creature in the Sea, can be used to distinguish the two species, Proceedings of the Royal Society B: Biological Sciences, shell loss likely helped the ancient relatives, Monterey Bay Aquarium: Giant Pacific Octopus, Smithsonian magazine: Ten Curious Facts About Octopuses, These could be the funniest animal pictures ever, Hockey game turned into COVID-19 superspreader event. Other colour-changing cells are reflective iridophores and white leucophores. Octopus is a very beautiful aquatic creature that is always fascinated by the humans. The pupil can be adjusted in size and a retinal pigment screens incident light in bright conditions. Colour vision appears to vary from species to species, for example being present in O. aegina but absent in O. They are extremely flexible too which is really neat because they can make the shape of their body to fit anything, even inside of a bottle lying on the ocean floor. Some other fun facts: They have three hearts and blue blood; they squirt ink to deter predators; and being boneless, they can squeeze into (or out of) tight spaces. The reason why they have so many eggs is that very few of them will be able to survive to maturity themselves. Earth is home to gobs of species, from tiny to gargantuan, and ordinary to downright weird. The number of eggs that can be deposited can be up to 200,000. , Some octopuses, such as the mimic octopus, can combine their highly flexible bodies with their colour-changing ability to mimic other, more dangerous animals, such as lionfish, sea snakes, and eels.  Octopuses hide in dens, which are typically crevices in rocky outcrops or other hard structures, though some species burrow into sand or mud. , About forty days after mating, the female giant Pacific octopus attaches strings of small fertilised eggs (10,000 to 70,000 in total) to rocks in a crevice or under an overhang.
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