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Argonautidae
The Argonautidae are a family of pelagic cephalopods that inhabit tropical and temperate oceans of the world. The family encompasses the modern paper nautiluses of the genus '' Argonauta'' along with several extinct genera of shelled octopods. Though argonauts are derived from benthic octopuses, they have evolved to depart the sea floor and live their life-cycle in the open seas. The family is characterised by brittle white shells constructed by the females, but which the dwarf male argonauts lack. These shells are primarily egg-cases, and are not attached to the body of the female. Paper nautiluses are often found washed up on beaches and are valued for their delicate beauty. The shell also plays the role of a buoyancy device, which the female controls by varying the amount of gulped air.Finn, Julian K., and Mark D. Norman. "The Argonaut Shell: Gas-mediated Buoyancy Control in a Pelagic Octopus." Proceedings: Biological Sciences 277, no. 1696 (2010): 2967-971. Accessed March 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argonautidae
The Argonautidae are a family of pelagic cephalopods that inhabit tropical and temperate oceans of the world. The family encompasses the modern paper nautiluses of the genus '' Argonauta'' along with several extinct genera of shelled octopods. Though argonauts are derived from benthic octopuses, they have evolved to depart the sea floor and live their life-cycle in the open seas. The family is characterised by brittle white shells constructed by the females, but which the dwarf male argonauts lack. These shells are primarily egg-cases, and are not attached to the body of the female. Paper nautiluses are often found washed up on beaches and are valued for their delicate beauty. The shell also plays the role of a buoyancy device, which the female controls by varying the amount of gulped air.Finn, Julian K., and Mark D. Norman. "The Argonaut Shell: Gas-mediated Buoyancy Control in a Pelagic Octopus." Proceedings: Biological Sciences 277, no. 1696 (2010): 2967-971. Accessed March 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argonauta Nodosa
''Argonauta nodosus'' reviously known as ''Argonauta nodosa'' also known as the knobby or knobbed argonaut, is a species of pelagic octopus. The female of the species, like all argonauts, creates a paper-thin eggcase that coils around the octopus much like the way a nautilus lives in its shell (hence the name paper nautilus). The shell is usually approximately 150 mm in length, although it can exceed 250 mm in exceptional specimens; the world record size is 292.0 mm. ''A. nodosus'' produces a very characteristic shell, which is covered in many small nodules on the ridges across the shell, hence the specific epithet ''nodosus'' and common name. These nodules are less obvious or even absent in juvenile females, especially those under 5 cm in length. All other argonaut species have smooth ridges across the shell walls. ''A. nodosus'' has a relatively wide distribution covering the Indo-Pacific region as well as the eastern coast of South America. The s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Izumonauta
''Izumonauta'' is an extinct genus of shelled octopods from the Mid to Late Miocene of Japan and New Zealand. The keels of ''Izumonauta'' eggcases lack tubercules and are intermediate in morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines * Morphology (archaeology), study of the shapes or forms of artifacts * Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies ... between those of the earlier '' Obinautilus'' and later '' Argonauta''. The New Zealand fossil material was described from the Kapitean Stage (uppermost Miocene).Marshall, B.A. (1971). ''Izumonauta'' (Argonautidae, Cephalopoda, Coleoida) from the Kapitean Stage (Uppermost Miocene) of New Zealand. ''New Zealand Journal of Geology and Geophysics'' 14: 288-292. References Further reading *Yanagisawa, Y. 1990. ''Bull. Geol. Surv. Japan'' 41 (3): 115-127. Argonautidae Cephalopod genera {{Octopus-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mizuhobaris
''Mizuhobaris'' is an extinct genus of shelled octopods from the Late Miocene. ''M. lepta'' was found in the Los Angeles Basin, California. This species is characterised by low radial ribs on a thin, keelless, planispirally coiled eggcase. It represents the first Argonautidae fossil from the Western Hemisphere The Western Hemisphere is the half of the planet Earth that lies west of the prime meridian (which crosses Greenwich, London, United Kingdom) and east of the antimeridian. The other half is called the Eastern Hemisphere. Politically, the te .... References Further reading *Yanagisawa, Y. 1990. ''Bull. Geol. Surv. Japan'' 41 (3): 115-127. Argonautidae Cephalopod genera {{Octopus-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obinautilus
''Obinautilus'' is an extinct genus of shelled cephalopod that has been variously identified as an argonautid octopodMartill, D.M. & M.J. Barker (2006). A paper nautilus (Octopoda, ''Argonauta'') from the Miocene Pakhna Formation of Cyprus. ''Palaeontology'' 49(5): 1035–1041. or a nautilid.UMUT CM 08493: ''Obinautilus pulchra'' Kobayashi, 1954 The University Museum, The University of Tokyo.Eyden, P. (2010) Fossil Octopuses TONMO. It is known from the to |
Kapal Batavus
''Kapal'' is a monotypic genus of shelled octopods comprising the species ''Kapal batavus''. ''Kapal batavus'' was described in 1930 based on fossil material from Lower Palembang shales of Sumatra. The eggcase of this species is considerably more evolute than that of '' Argonauta'', possessing an open umbilical region, and seems to lack the nodes present in members of that genus. ''Kapal ''Kapal'' is a monotypic genus of shelled octopods comprising the species ''Kapal batavus''. ''Kapal batavus'' was described in 1930 based on fossil material from Lower Palembang shales of Sumatra. The eggcase of this species is considerably ...'' is Indonesian for "ship". References Argonautidae Monotypic mollusc genera Cephalopod generaKapal LCT {{Octopus-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kapal
''Kapal'' is a monotypic genus of shelled octopods comprising the species ''Kapal batavus''. ''Kapal batavus'' was described in 1930 based on fossil material from Lower Palembang shales of Sumatra. The eggcase of this species is considerably more evolute than that of '' Argonauta'', possessing an open umbilical region The umbilical region, is one of the nine regions of the abdomen. It is the region that surrounds the area around the umbilicus and is placed approximately half way between the xiphoid process and the pubic symphysis. This region of the abdomen c ..., and seems to lack the nodes present in members of that genus. '' Kapal'' is Indonesian for "ship". References Argonautidae Monotypic mollusc genera Cephalopod generaKapal LCT {{Octopus-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod
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 ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octopus
An octopus ( : octopuses or octopodes, see below for variants) 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 center 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. Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tree Of Life Web Project
The Tree of Life Web Project is an Internet project providing information about the diversity and phylogeny of life on Earth. This collaborative peer reviewed project began in 1995, and is written by biologists from around the world. The site has not been updated since 2011, however the pages are still accessible. The pages are linked hierarchically, in the form of the branching evolutionary tree of life, organized cladistically. Each page contains information about one particular group of organisms and is organized according to a branched tree-like form, thus showing hypothetical relationships between different groups of organisms. In 2009 the project ran into funding problems from the University of Arizona. Pages and Treehouses submitted took a considerably longer time to be approved as they were being reviewed by a small group of volunteers, and apparently, around 2011, all activities ended. History The idea of this project started in the late 1980s. David Maddison was wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia and it is located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. Comprising the westernmost peninsulas of Eurasia, it shares the continental landmass of Afro-Eurasia with both Africa and Asia. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south and Asia to the east. Europe is commonly considered to be Boundaries between the continents of Earth#Asia and Europe, separated from Asia by the drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea and the waterways of the Turkish Straits. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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