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Grimpoteuthis Greeni
''Grimpoteuthis greeni'' is a dumbo octopus found in deep waters off southern Australia. The species was initially described from three specimens (1 male and 2 female), with a further three specimens identified since then. Description This ''Grimpoteuthis'' has moderately large and laterally placed fins. The arms have up to 60 suckers on males and 67 on females. The suckers are flanked by cirri (a pair of these finger-like projections located between each sucker), the longest being around 1.0 to 1.7 × the greatest sucker diameter. The webbing between the arms is terminated on the ventral edge of each arm by a fleshy projection ('web nodule') positioned between suckers 19 to 24 on ventral arms and 24 to 28 on the dorsal arms. Internal shell U-shaped, with well-developed 'shoulders' at lateral corners and with the ends of the shell terminating in broad lobes, each lobe with concave indent and spike-like projection from the ventral edge. Regarding the digestive system, the radul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grimpoteuthis
''Grimpoteuthis'' is a genus of pelagic Cirrina, cirrate (finned) octopods known as the dumbo octopus. 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 (mollusc), mantle above each eye. There are 17 species recognized in the genus. The Dumbo octopus has a gelatinous body and uses fin propulsion for movement, which also helps it to conserve energy in its extreme deep-sea environment. These unique physical traits distinguish it from other octopuses, which primarily rely on jet propulsion. Prey include crustaceans, bivalves, worms and copepods. The average life span of various ''Grimpoteuthis'' species is 3 to 5 years. Range and habitat Species of ''Grimpoteuthis'' are assumed to have a worldwide distribution, living in the cold, Abyssal plain, abyssal depths ranging from . Specimens have been found off the coasts of Oregon, the Philippines, Marth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirrate Shell
Cirrate octopuses possess a well-developed internal shell that supports their muscular swimming fins. This is in contrast to the more familiar, finless, incirrate octopuses, in which the shell remnant is either present as a pair of stylets or absent altogether. The cirrate shell is quite unlike that of any other living cephalopod group and has its own dedicated set of descriptive terms. It is usually roughly arch- or saddle-shaped and is rather soft, being similar in consistency to cartilage. Each of the eight extant cirrate genera is characterised by a distinct shell morphology outlined below (below taxonomy updated per WoRMS): *Superfamily Cirroteuthoidea ** Cirroteuthidae ***'' Cirroteuthis'' — saddle-shaped, with large wings ***'' Cirrothauma'' — butterfly-shaped ** Stauroteuthidae ***'' Stauroteuthis'' — U-shaped *Superfamily Opisthoteuthoidea ** Opisthoteuthidae ***'' Opisthoteuthis'' (also '' Exsuperoteuthis'' & '' Insigniteuthis'')— U-shaped, lateral wings usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radula
The radula (; : radulae or radulas) is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the mollusks, and is found in every class of mollusk except the bivalves, which instead use cilia, waving filaments that bring minute organisms to the mouth. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth ( denticles) on the radular ribbon varies considerably from one group to another. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other mollusks. Other predatory marine snails, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grimpoteuthis Innominata
''Grimpoteuthis innominata'', commonly known as the small jellyhead, is a species of small, pelagic octopus described by Steve O'Shea in 1999 from two specimens, however several further specimens have since been identified. The genus ''Enigmateuthis'' was described to contain this species when described, but Martin Collins placed the species in the genus ''Grimpoteuthis'' due to uncertainty regarding the type specimen of ''Grimpoteuthis''. Description and habitat ''Grimpoteuthis innominata'' has been collected from the Chatham Rise to the east of New Zealand, with a bathymetric range approximately 1600 to 2400 meters depth, close to the seafloor (likely demersal). The octopus is small, "fitting in two outstretched palms," and its colouring is dark red. This octopus' mantle reaches 43 millimeters long, and a total length up to 156 millimeters long on the type material, it has an internal shell Shell may refer to: Architecture and design * Shell (structure), a thin structure * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swiss Journal Of Palaeontology
The ''Swiss Journal of Palaeontology'' is a biannual open access peer-reviewed scientific journal covering palaeontology and taxonomy published by BioMed Central. It is affiliated with the Swiss Geological Society and a member of the Swiss Academy of Sciences. History The journal was established as ''Schweizerische Paläontologische Abhandlungen'' in 1874 and was published by the Natural History Museum of Basel. In 2011, it was relaunched as the ''Swiss Journal of Palaeontology'' and publisher became BioMed Central. Since 2020 the journal is open access. Abstracting and indexing The journal is abstracted and indexed in: According to the ''Journal Citation Reports'', the journal has a 2023 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a type of journal ranking. Journals with higher impact factor values are considered more prestigious or important within their field. The Impact Factor of a journa ... of 3.0. References Exte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Margin
A continental margin is the outer edge of continental crust abutting oceanic crust under coastal waters. It is one of the three major zones of the ocean floor, the other two being deep-ocean basins and mid-ocean ridges. The continental margin consists of three different features: the continental rise, the continental slope, and the continental shelf. Continental margins constitute about 28% of the oceanic area. Subzones The continental shelf is the relatively shallow water area found in proximity to continents; it is the portion of the continental margin that transitions from the shore out towards to ocean. Continental shelves are believed to make up 7% of the sea floor. The width of continental shelves worldwide varies in the range of 0.03–1500 km. The continental shelf is generally flat, and ends at the shelf break, where there is a drastic increase in slope angle: The mean angle of continental shelves worldwide is 0° 07′, and typically steeper closer to the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octopuses
An octopus (: octopuses or octopodes) is a soft-bodied, eight-limbed Mollusca, mollusc of the order (biology), 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 symmetry in biology, bilaterally symmetric with two eyes and a cephalopod beak, beaked mouth at the centre point of the eight limbs. An octopus can radically deform its shape, enabling it to squeeze through small gaps. They trail their appendages behind them as they swim. The Siphon (mollusc), siphon is used for aquatic respiration, respiration and aquatic locomotion, locomotion (by jet propulsion#Jet-propelled animals, water jet propulsion). Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse invertebrates. Octopuses inhabit various ocean habitats, including coral reefs, pelagic waters, and the seabed; some live in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopods Of Australia
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
