|
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 Marc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argonaut (animal)
The argonauts (genus ''Argonauta'', the only extant taxon, extant genus in the family Argonautidae) are a group of pelagic octopus, octopuses. They are also called paper nautili, referring to the paper-thin eggcase that females secrete; however, as octopuses, they are only distant relatives of true Nautilus, nautili. Their structure lacks the gas-filled chambers present in chambered nautilus shells and is not a true Cephalopod#Shell, cephalopod shell, but rather an evolutionary innovation unique to the genus. It is used as a brood chamber, and to trap surface air to maintain buoyancy. It was once speculated that argonauts did not manufacture their eggcases but utilized shells abandoned by other organisms, in the manner of hermit crabs. Experiments by pioneering marine biologist Jeanne Villepreux-Power in the early 19th century disproved this hypothesis, as Villepreux-Power successfully reared argonaut young and observed their shells' development. Argonauts are found in Tropi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argonauta Nodosa
''Argonauta nodosus'' [previously 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 argonaut (animal), 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. Description Females grow to 100 mm ML and 300 mm total length, while males do not exceed 40 mm in length. T ... [...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 180th meridian.- The other half is called the Eastern Hemisphere. Geopolitically, .... 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 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 halfway between the xiphoid process and the pubic symphysis. This region of the abdomen ..., and seems to lack the nodes present in members of that genus. '' Kapal'' is Indonesian for "ship". Extinct animals of Indonesia References Kapal LCT Argonautidae Monotypic prehistoric cephalopod genera {{Octopus-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octopus
An octopus (: octopuses or octopodes) 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. 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 is used for respiration and locomotion (by 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 the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived. In most species, the male uses a speciall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tree Of Life Web Project
The Tree of Life Web Project (ToL) 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an international border with the Mexico, Mexican state of Baja California to the south. With almost 40million residents across an area of , it is the List of states and territories of the United States by population, largest state by population and List of U.S. states and territories by area, third-largest by area. Prior to European colonization of the Americas, European colonization, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America. European exploration in the 16th and 17th centuries led to the colonization by the Spanish Empire. The area became a part of Mexico in 1821, following Mexican War of Independence, its successful war for independence, but Mexican Cession, was ceded to the U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. 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 shares the landmass of Eurasia with Asia, and of Afro-Eurasia with both Africa and Asia. Europe is commonly considered to be Boundaries between the continents#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 waterway of the Bosporus, Bosporus Strait. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and Europe ... is formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles." Europe covers approx. , or 2% of Earth#Surface, Earth's surface (6.8% of Earth's land area), making it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
