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Encyclopedia > Lobe finned fish
iSarcopterygii
Fossil range: Latest Silurian - Recent
Coelacanth, Latimeria chalumnae
Coelacanth, Latimeria chalumnae
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclass: Osteichthyes
Class: Sarcopterygii
Subclasses

Sarcopterygii (from Greek sarx, flesh, and pteryx, fin) is traditionally the class of lobe-finned fishes, consisting of lungfish and coelacanths. These are bony fish with paired rounded fins. These fins, being similar to limbs, suggest that these fish may be ancestors of land vertebrates. The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... Image File history File links Coelacanth-bgiu. ... Families See text. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Parazoa Porifera (sponges) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Myxozoa (slime animals) Superphylum Deuterostomia (blastopore becomes anus) Chordata (vertebrates, etc. ... {{{subdivision_ranks}}} See below Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates. ... Classes and Clades See below Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Classes Placodermi Chondrichthyes Acanthodii Osteichthyes Gnathostomata is the group of vertebrates with jaws. ... Class Actinopterygii Sarcopterygii Osteichthyes are a taxonomic superclass of fish, also called bony fish that includes the ray-finned fish (Actinopterygii) and lobe finned fish (Sarcopterygii). ... Species Latimeria chalumnae Latimeria menadoensis Coelacanths (pronounced SEE-le-canth, meaning hollow spine in Greek) are lobe_finned fish with the pectoral and anal fins on fleshy stalks supported by bones, and the tail fin divided into three lobes, the middle one of which also has a stalk. ... For the musical band, see Lungfish (band). ... Groups See text. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... The Guppy (Poecilia reticulata) is one of the most popular freshwater aquarium fish species in the world. ... Orders See text. ... Families See text. ... Classes Synapsida Sauropsida Amphibia A tetrapod (Greek tetrapoda, four-legged) is a vertebrate animal having four feet, legs or leglike appendages. ...


Most taxonomists who subscribe to the cladistic approach include within this group the superclass Tetrapoda, which in turns consists of all species of four-limbed vertebrates. The fin-limbs of sarcopterygiians show such a strong similarity to the expected ancestral form of tetrapod limbs that they have been universally considered the direct ancestors of tetrapods in the scientific literature. This cladogram shows the relationship among various insect groups. ... Classes Synapsida Sauropsida Amphibia A tetrapod (Greek tetrapoda, four-legged) is a vertebrate animal having four feet, legs or leglike appendages. ... Classes and Clades See below Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ...


Taxonomy and Phylogeny

In Late Devonian vertebrate speciation, descendants of pelagic lobe-finned fish – like Eusthenopteron – exhibited a sequence of adaptations: Panderichthys, suited to muddy shallows; Tiktaalik with limb-like fins that could take it onto land; Early tetrapods in weed-filled swamps, such as: Acanthostega which had feet with eight digits, Ichthyostega with limbs. Descendants also included pelagic lobe-finned fish such as coelacanth species.
In Late Devonian vertebrate speciation, descendants of pelagic lobe-finned fish – like Eusthenopteron – exhibited a sequence of adaptations: Descendants also included pelagic lobe-finned fish such as coelacanth species.

Species Latimeria chalumnae Latimeria menadoensis Coelacanths (pronounced SEE-le-canth, meaning hollow spine in Greek) are lobe_finned fish with the pectoral and anal fins on fleshy stalks supported by bones, and the tail fin divided into three lobes, the middle one of which also has a stalk. ... Species Latimeria chalumnae Latimeria menadoensis Coelacanths (pronounced SEE-le-canth, meaning hollow spine in Greek) are lobe_finned fish with the pectoral and anal fins on fleshy stalks supported by bones, and the tail fin divided into three lobes, the middle one of which also has a stalk. ... Orders See text The Rhipidistia are an extinct type of lobe-finned fishes. ... For the musical band, see Lungfish (band). ... For the musical band, see Lungfish (band). ... For the musical band, see Lungfish (band). ... Subgroups See text Tetrapodomorpha is a clade of vertebrates, consisting of sarcopterygians with a number of features of tetrapods. ... Binomial name Eusthenopteron foordi Eusthenopteron foordi Whiteaves 1881 is a genus of lobe-finned fish which has attained an iconic status from its close relationships to tetrapods. ... Hyneria lindae was a prehistoric predatory lobe-finned fish that lived during the Devonian period. ... Osteolepis is an extinct genus of fish. ... Panderichthys Panderichthys is a 90-130 cm long fish from the Late Devonian period . ... Binomial name Tiktaalik roseae Daeschler, Shubin & Jenkins, 2006 Tiktaalik (IPA pronunciation: ) is a genus of extinct sarcopterygian (lobe-finned) fishes from the late Devonian period, with many features akin to those of tetrapods (four-legged animals). ... Classes Synapsida Sauropsida Amphibia A tetrapod (Greek tetrapoda, four-legged) is a vertebrate animal having four feet, legs or leglike appendages. ... Image File history File links Fishapods. ... Image File history File links Fishapods. ... Disambiguation: Devonian is sometimes used to refer to the Southwestern Brythonic language, and the people of the county of Devon are sometimes referred to as Devonians The Devonian is a geologic period of the Paleozoic era. ... Classes and Clades See below Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Diagram of the layers of the pelagic zone. ... Binomial name Eusthenopteron foordi Eusthenopteron foordi Whiteaves 1881 is a genus of lobe-finned fish which has attained an iconic status from its close relationships to tetrapods. ... Panderichthys Panderichthys is a 90-130 cm long fish from the Late Devonian period . ... Binomial name Tiktaalik roseae Daeschler, Shubin & Jenkins, 2006 Tiktaalik (IPA pronunciation: ) is a genus of extinct sarcopterygian (lobe-finned) fishes from the late Devonian period, with many features akin to those of tetrapods (four-legged animals). ... Groups See text. ... Acanthostega Acanthostega gunnari is an extinct amphibian tetrapod species, among the first animals to have recognizable limbs. ... Species Ichthyostega (Greek: fish roof) is an early tetrapod genus living in the Upper Devonian (Famennian) period, 367-362. ... Families See text. ...

Evolution of Sarcopterygii

Sarcopterygians belong to Osteichthyes group or bony fishes, characterized by their bony skeleton instead of cartilage. The oldest Sarcopterygians were found in the Uppermost Silurian. The first Sarcopterygian closely resembled Acanthodians. The Sarcopterygians closest relatives were the Actinopterygians - ray-finned fishes. Sarcopterygians probably evolved in the oceans, but they later came into freshwater habitats to avoid the predatory placoderms - which were dominant in the Early - Middle Devonian seas. As Sarcopterygians evolve in the Early Devonian, the line splits into two main lineages - the Coelacanths, and the Rhipidistians. The Coelacanths appeared in the Early Devonian, and stayed in the oceans, the coelacanths heyday was the Late Devonian and Carboniferous because they were more common at these times than any other period in the Phanerozoic. Coelacanths still live today in the oceans. Rhipidistians appeared about the same time as the Coelacanths, but unlike them, Rhipidistians left the ocean world and migrated into the freshwater habitats, their ancestors probably lived in the oceans near the river mouths (estuaries). The Rhipidistians in turn split into two major groups - the lungfishes, and the tetrapodomorphs. The lungfishes' greatest diversity was in the Triassic Period, but today, there are less than a dozen genera left. The lungfishes evolved the first proto-lungs and proto-limbs. The lungfishes, ancient and modern, used their stubby fins (proto-limbs) to walk in land if their waterhole is depleted, and used their lungs to breathe air and get sufficient oxygen. The tetrapodomorphs have the same identical anatomy as the lungfishes, who were their closest kin, but the tetrapodomorphs appear to have stayed in water a little longer until the Late Devonian. Tetrapods - four legged vertebrates were the terapodomorphs descendants. Tetrapods appeared in the Late Devonian epoch. Class Actinopterygii Sarcopterygii Osteichthyes are a taxonomic superclass of fish, also called bony fish that includes the ray-finned fish (Actinopterygii) and lobe finned fish (Sarcopterygii). ... Cartilage is a type of dense connective tissue. ... The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... Acanthodii (sometimes called spiny sharks) is a class of extinct fishes, having features of both bony fish ( Osteichthyes) and cartilaginous fish (Chondrichthyes). ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ... Disambiguation: Devonian is sometimes used to refer to the Southwestern Brythonic language, and the people of the county of Devon are sometimes referred to as Devonians The Devonian is a geologic period of the Paleozoic era. ... Families See text. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... Species Latimeria chalumnae Latimeria menadoensis Coelacanth (meaning hollow spine in Greek; IPA: ) is a species of fish and represents the oldest lineage of living fish known to date. ... The worlds oceans as seen from the South Pacific Ocean, before the definition of the Southern Ocean in 2000 Oceans (from Okeanos in Greek, the ancient Greeks noticing the strong current that flowed off Gibraltar and assuming it was a great river) cover almost three quarters (71%) of the... River upstream of an Australian trout farm A river is a large natural waterway. ... An estuary is a semi-enclosed coastal body of water which has a free connection with the open sea and within which sea water mixes with fresh water. ... The Triassic is a geologic period that extends from about 251 to 200 Ma (million years ago). ... Disambiguation: Devonian is sometimes used to refer to the Southwestern Brythonic language, and the people of the county of Devon are sometimes referred to as Devonians The Devonian is a geologic period of the Paleozoic era. ... Classes Synapsida Sauropsida Amphibia A tetrapod (Greek tetrapoda, four-legged) is a vertebrate animal having four feet, legs or leglike appendages. ... Disambiguation: Devonian is sometimes used to refer to the Southwestern Brythonic language, and the people of the county of Devon are sometimes referred to as Devonians The Devonian is a geologic period of the Paleozoic era. ...

to be continued
Coelacanths are the only sarcopterygians that live in the ocean
Coelacanths are the only sarcopterygians that live in the ocean

Image File history File links Species  Latimeria chalumnae Family  Latimeriidae File links The following pages link to this file: Coelacanth ... Image File history File links Species  Latimeria chalumnae Family  Latimeriidae File links The following pages link to this file: Coelacanth ...

See also


 
 

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