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An octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda. The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a beaked mouth at the centre point of the eight limbs. The soft body can radically alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.
Polydactyly is a birth defect that results in extra fingers or toes. The hands are more commonly involved than the feet. Extra fingers may be painful, affect self-esteem, or result in clumsiness.
The giant squid is a species of deep-ocean dwelling squid in the family Architeuthidae. It can grow to a tremendous size, offering an example of abyssal gigantism: recent estimates put the maximum size at around 12–13 m (39–43 ft) for females and 10 m (33 ft) for males, from the posterior fins to the tip of the two long tentacles. This makes it longer than the colossal squid at an estimated 9–10 m (30–33 ft), but substantially lighter, as the tentacles make up most of the length. The mantle of the giant squid is about 2 m long, and the length of the squid excluding its tentacles rarely exceeds 5 m (16 ft). Claims of specimens measuring 20 m (66 ft) or more have not been scientifically documented.
Vitreledonella richardi, also known as the glass octopus, is an incirrate octopus. It is in the genus Vitreledonella and of the family Amphitretidae.
A hectocotylus is one of the arms of male cephalopods that is specialized to store and transfer spermatophores to the female. Structurally, hectocotyli are muscular hydrostats. Depending on the species, the male may use it merely as a conduit to the female, analogously to a penis in other animals, or he may wrench it off and present it to the female.
Tremoctopus is a genus of pelagic cephalopods, containing four species that occupy surface to mid-waters in subtropical and tropical oceans. They are commonly known as blanket octopuses, in reference to the long, transparent webs that connect the dorsal and dorsolateral arms of the adult females. The other arms are much shorter and lack webbing.
The mimic octopus is a species of octopus from the Indo-Pacific region. Like other octopuses, it uses its chromatophores to disguise itself. It is noteworthy for being able to impersonate a wide variety of other marine animals. While many animals mimic either their environment or other animals to avoid predation, the mimic octopus and its close relative the wunderpus are the only ones known to actively imitate several animals in order to elude predators.
Cephalopod intelligence is a measure of the cognitive ability of the cephalopod class of molluscs.
Terrestrial locomotion has evolved as animals adapted from aquatic to terrestrial environments. Locomotion on land raises different problems than that in water, with reduced friction being replaced by the increased effects of gravity.
Polymelia is a birth defect in which an affected individual has more than the usual number of limbs. It is a type of dysmelia. In humans and most land-dwelling vertebrates, this means having five or more limbs. The extra limb is most commonly shrunken and/or deformed. The term is from Greek πολυ- "many", μέλεα "limbs".
The giant Pacific octopus, also known as the North Pacific giant octopus, is a large marine cephalopod belonging to the genus Enteroctopus and Enteroctopodidae family. Its spatial distribution encompasses much of the coastal North Pacific, from the Mexican state of Baja California, north along the United States' West Coast, and British Columbia, Canada; across the northern Pacific to the Russian Far East, south to the East China Sea, the Yellow Sea, the Sea of Japan, Japan's Pacific east coast, and around the Korean Peninsula. It can be found from the intertidal zone down to 2,000 m (6,600 ft), and is best-adapted to colder, oxygen- and nutrient-rich waters. It is the largest octopus species on earth and can often be found in aquariums and research facilities in addition to the ocean. E. dofleini play an important role in maintaining the health and biodiversity of deep sea ecosystems, cognitive research, and the fishing industry.
Supernumerary body parts are most commonly a congenital disorder involving the growth of an additional part of the body and a deviation from the body plan. Body parts may be easily visible or hidden away, such as internal organs.
The common blanket octopus or violet blanket octopus is a large octopus of the family Tremoctopodidae found worldwide in the epipelagic zone of warm seas. The degree of sexual dimorphism in this species is very high, with females growing up to two meters in length, whereas males grow to about 2.4 cm. The first live specimen of a male was not seen until 2002 off the Great Barrier Reef. Individual weights of males and females differ by a factor of about 10,000 and potentially more.
All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles.
Paul Zachary Myers is an American biologist who founded and writes the Pharyngula science blog. He is associate professor of biology at the University of Minnesota Morris (UMM) where he works in the field of developmental biology. He is a critic of intelligent design, the creationist movement, and other pseudoscientific concepts.
PZ Cussons plc is a major British manufacturer of personal healthcare products and consumer goods. It operates worldwide, especially in nations in Africa and the Commonwealth. The company is listed on the London Stock Exchange.
Eledone moschata, the musky octopus, is a species of octopus belonging to the family Octopodidae.
Constriction ring syndrome (CRS) is a congenital disorder with unknown cause. Because of the unknown cause there are many different, and sometimes incorrect, names. It is a malformation due to intrauterine bands or rings that produce deep grooves in extremities such as fingers and toes. In rare cases the constriction ring can form around other parts of the fetus and cause amputation or even intrauterine death. The anatomy proximal to the site of constriction is developmentally normal. CRS can be associated with other malformations, with club foot being most common. The precise configuration of the bands, lymphedema, and character of the amputations are not predictable and vary with each individual patient. Also, more than one extremity is usually affected, and it is rare for only one ring to present as an isolated malformation with no other manifestation of this syndrome.
Eating live animals is the practice of humans eating animals that are still alive. It is a traditional practice in many East Asian food cultures. Animals may also be eaten alive for shock value. Eating live animals, or parts of live animals, may be unlawful in certain jurisdictions under animal cruelty laws. Religious prohibitions on the eating of live animals by humans are also present in various world religions.
Wunderpus photogenicus, the wunderpus octopus, is a small-bodied species of octopus with distinct white and rusty brown coloration. 'Wunderpus' from German "wunder" meaning 'marvel or wonder'.
References
- 1 2 3 "Six-legged 'hexapus' claimed as world first in Britain". 3 March 2008. Archived from the original on 6 March 2008. Retrieved 3 March 2008.
- 1 2 3 Chivers, Tom (3 March 2008). "A hexapus, not a six-legged octopus". Telegraph. Archived from the original on 6 March 2008. Retrieved 3 March 2008.
- ↑ Ahmed, Saeed (4 March 2008). "World's first six-legged octopus discovered". CNN. Retrieved 6 March 2008.
- ↑ PZ Myers (3 March 2008). "Hexapus!". Archived from the original on 6 March 2008. Retrieved 5 March 2008.
- ↑ Kumph, H.E. (1960). "Arm abnormality in octopus". Nature. 185 (4709): 334–335. doi:10.1038/185334a0.
- ↑ Toll, R.B.; Binger, L.C. (1991). "Arm anomalies: cases of supernumerary development and bilateral agenesis of arm pairs in Octopoda (Mollusca, Cephalopoda)". Zoomorphology. 110 (6): 313–316. doi:10.1007/BF01668021.
- ↑ http://www.publico.pt/ecosfera/noticia/um-dois-tres-quatro-cinco-seis-tentaculos-1618696 Público (Portugal)
- ↑ Johnson, Daniel (26 July 2013). "Fisherman smashes rare six-legged octopus against rock and eats it". (with pictures). The Telegraph. Retrieved 5 October 2018.
- ↑ "Tourist Smashes, Kills, Eats Octopus Only To Find Out It's An Extremely Rare 'Hexapus'". Huffington Post. 26 July 2013. Retrieved 5 October 2018.