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Cephalaspid
Cephalaspidida is an extinct order of jawless fish in the subclass Cornuata. See also * ''Undichna'', a fish-fin, or fish-swimming fossil trail left as a fossil impression on a substrate, or the opposite impression on an overlying substrate * Anatol Heintz Anatol Heintz (9 February 1898 – 23 February 1975) was a Russo-Norwegian palaeontologist. He was born in Petrograd to the geophysicist Yevgeniy Alfredovich Heintz (1869–1918) and Olga Fyodorovna Hoffmann (1871–1958). He had two older si ... (1898–1975), a Norwegian palaeontologist who published in 1939 ''Cephalaspida from Downtonian of Norway'', about cephalaspida excavated at Ringerike. References * J. A. Moy-Thomas and R. S. Mile. 1971. ''Palaeozoic Fishes'' External links * Cephalaspidida at fossilworks.org(retrieved 16 April 2016) Osteostraci Prehistoric jawless fish orders {{Paleo-jawless-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalaspidae
Cephalaspidae is an extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ... family of jawless fish in the class Osteostraci. References * J. A. Moy-Thomas and R. S. Mile. 1971. ''Palaeozoic Fishes'' * T. H. Huxley. 1861. Preliminary essay upon the systematic arrangement of the fishes of the Devonian Epoch. Memoirs of the Geological Survey of Great Britain, decade 10 23:1-40 External links * Cephalaspidae at fossilworks.org(retrieved 16 April 2016) Prehistoric jawless fish families Osteostraci {{Paleo-jawless-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chordata
A chordate () is an animal of the phylum Chordata (). All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also Bilateral symmetry, bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit Metameric, metameric segmentation. In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels (CSIs) in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalaspis Tenuicornis
''Cephalaspis'' (from el, κεφαλή , 'head' and el, ἀσπίς , 'shield') is a possibly monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in the early Devonian. Description Like its relatives, ''Cephalaspis'' was heavily armored, presumedly to defend against predatory placoderms and eurypterids, as well as to serve as a source of calcium for metabolic functions in calcium-poor freshwater environments. It had sensory patches along the rim and center of its head shield, which were used to sense for worms and other burrowing organisms in the mud. Diet Because its mouth was situated directly beneath its head, ''Cephalaspis'' was thought of as being a bottom-feeder, akin to a heavily armoured catfish or sturgeon. It moved its plow-like head from side to side, ''Cephalaspis'' easily stirring sand and dust into the water, along with revealing the hiding places of its prey, digging up worms or crustaceans hidden i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osteostraci
The class Osteostraci (meaning "bony shells") is an extinct taxon of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans. This is due to the development of paired fins, and their complicated cranial anatomy. The osteostracans were more similar to lampreys than to jawed vertebrates in possessing two pairs of semicircular canals in the inner ear, as opposed to the three pairs found in the inner ears of jawed vertebrates. They are thought to be the sister-group to pituriaspids, and together, these two taxa of jawless vertebrates are the sister-group of gnathostomes. Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornuata
The class Osteostraci (meaning "bony shells") is an extinct taxon of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans. This is due to the development of paired fins, and their complicated cranial anatomy. The osteostracans were more similar to lampreys than to jawed vertebrates in possessing two pairs of semicircular canals in the inner ear, as opposed to the three pairs found in the inner ears of jawed vertebrates. They are thought to be the sister-group to pituriaspids, and together, these two taxa of jawless vertebrates are the sister-group of gnathostomes. Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superciliaspis
''Superciliaspis'' is an extinct genus of jawless fish which existed in what is now the Northwest Territories of Canada during the Lochkovian age. Originally identified as a species of ''Cephalaspis ''Cephalaspis'' (from el, κεφαλή , 'head' and el, ἀσπίς , 'shield') is a possibly monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in the early Devonian. Description L ...'' (''C. gabrielsi'') by Dineley and Loeffler in 1976, it was reassigned to ''Superciliaspis gabrielsi'' by Adrain and Wilson in 1994. References Osteostraci genera Fossils of British Columbia Fish enigmatic taxa Devonian jawless fish Fossil taxa described in 1994 {{Devonian-jawless-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Undichna
''Undichna'' is a fish-fin, or fish-swimming fossil trail left as a fossil impression on a substrate, or the opposite impression on an overlying substrate; this type of fossil is an ichnofossil, in this case a specific ichnogenus, ''Undichna''; the term "undichna" is composed of the words: 'und'–'ichna', for "wave-trace". At present, the oldest known ''Undichna'' were made by cephalaspids, that only had presumptive motion scenarios, due to the physiological form of the cephalaspids as predating the teleosts, (bony fishes). The trails are from the border of England and Wales, from 400 mya, in an ancient riverbed environment. See also *Lateral undulation, a type of undulation for fish, sea animals, and snake Snakes are elongated, Limbless vertebrate, limbless, carnivore, carnivorous reptiles of the suborder Serpentes . Like all other Squamata, squamates, snakes are ectothermic, amniote vertebrates covered in overlapping Scale (zoology), scales. Ma ...s * Trace fossi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatol Heintz
Anatol Heintz (9 February 1898 – 23 February 1975) was a Russo-Norwegian palaeontologist. He was born in Petrograd to the geophysicist Yevgeniy Alfredovich Heintz (1869–1918) and Olga Fyodorovna Hoffmann (1871–1958). He had two older siblings. In 1919 the family fled to Norway. He studied at the Norwegian National Academy of Craft and Art Industry from 1919 to 1920 and at the Royal Frederick University from 1920, where he graduated in palaeontology in 1928. He was then hired as a curator at the Paleontological Museum of Tøyen. He took the dr.philos. degree in 1932 on the thesis ''The Structure of Dinichthys. A Contribution to our Knowledge of the Arthrodira''. As a researcher he was inspired by Johan Kiær, and specialized in ancient fish, conducting paleontological expeditions to Svalbard. In 1939 he published ''Cephalaspida from Downtonian of Norway'', about cephalaspida excavated at Ringerike. He was appointed professor at the University of Oslo and director of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Alan Moy-Thomas
James Alan Moy-Thomas (12 September 1908 – 29 February 1944) was an English palaeontological ichthyologist. Son of Alan Moy-Thomas and his wife Gertrude, he was born in London. He had a younger brother Edward and an older sister Joan Caroline. He was educated at Eton and at Christ Church, Oxford, where he graduated with a first class degree in zoology in 1930 He authored numerous papers on palaeontological ichthyology. In 1933 he married Joy Mitchell in Wharfedale, Yorkshire. In 1941 he was granted a Commission in the Special Duties Branch (i.e. intelligence) of the RAF. His service number was 66643. He died in a motor vehicle accident in 1944 and was buried in Cambridge. An obituary was published in ''The Times'', and another by Edwin Stephen Goodrich was published in ''Nature''. Two genera of Palaeozoic fish, ''Jamoytius'' and '' Moythomasia'', are named after him. His brother Edward died later that year on active service in the Netherlands, during Operation M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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