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Jamoytiiformes
Jamoytiiformes is an extinct order of prehistoric jawless fish in the superclass Anaspidomorphi. Taxonomy Taxonomy is based on Mikko's Phylogeny Archive * Family † Achanarellidae Newman 2002 ** Genus †'' Achanarella'' Newman 2002 'Achanarella'' Saxon 1978 nomen nudum*** †'' Achanarella trewini'' Newman 2002 * Family † Jamoytiidae White 1946 ** Genus †'' Conopiscius'' Briggs & Clarkson 1987 *** †'' Conopiscius clarki'' Briggs & Clarkson 1987 ** Genus †''Jamoytius ''Jamoytius kerwoodi'' was a species of primitive, eel-like jawless fish that lived in the Llandovery epoch of the Early Silurian period. Long thought of as a "basal anaspid," ''J. kerwoodi'' is now recognized as the best-known member of the H ...'' White 1946 *** †'' Jamoytius kerwoodi'' White 1946 References * A New Interpretation of Jamoytius Kerwoodi White. Alexander Ritchie, Nature, volume 188, pages 647–649 (19 November 1960), External links Prehistoric jawless fish orders [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamoytius Kerwoodi
''Jamoytius kerwoodi'' was a species of primitive, eel-like jawless fish that lived in the Llandovery epoch of the Early Silurian period. Long thought of as a "basal anaspid," ''J. kerwoodi'' is now recognized as the best-known member of the Hyperoartian order (biology), order Jamoytiiformes. It had an elongated body, and is thought to have had, in comparison with relatives known from intact bodies like ''Euphanerops'', a dorsal fin and an anal fin near the rearmost third of its body. Earlier reconstructions depict the creature as having side-fins running the length of its body, starting from behind the branchial openings to the tip of its tail: new research demonstrates that such "fins" are actually deformations of the bodywall as the corpse was being squished post-burial. In life, ''J. kerwoodi'' resembled a lamprey with a very small mouth. Because the fossil had no teeth, teeth-like structures, nor suggestions of either in its mouth, it was not carnivorous like many modern lamp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamoytius
''Jamoytius kerwoodi'' was a species of primitive, eel-like jawless fish that lived in the Llandovery epoch of the Early Silurian period. Long thought of as a "basal anaspid," ''J. kerwoodi'' is now recognized as the best-known member of the Hyperoartian order Jamoytiiformes. It had an elongated body, and is thought to have had, in comparison with relatives known from intact bodies like ''Euphanerops'', a dorsal fin and an anal fin near the rearmost third of its body. Earlier reconstructions depict the creature as having side-fins running the length of its body, starting from behind the branchial openings to the tip of its tail: new research demonstrates that such "fins" are actually deformations of the bodywall as the corpse was being squished post-burial. In life, ''J. kerwoodi'' resembled a lamprey with a very small mouth. Because the fossil had no teeth, teeth-like structures, nor suggestions of either in its mouth, it was not carnivorous like many modern lampreys. It was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamoytiiformes
Jamoytiiformes is an extinct order of prehistoric jawless fish in the superclass Anaspidomorphi. Taxonomy Taxonomy is based on Mikko's Phylogeny Archive * Family † Achanarellidae Newman 2002 ** Genus †'' Achanarella'' Newman 2002 'Achanarella'' Saxon 1978 nomen nudum*** †'' Achanarella trewini'' Newman 2002 * Family † Jamoytiidae White 1946 ** Genus †'' Conopiscius'' Briggs & Clarkson 1987 *** †'' Conopiscius clarki'' Briggs & Clarkson 1987 ** Genus †''Jamoytius ''Jamoytius kerwoodi'' was a species of primitive, eel-like jawless fish that lived in the Llandovery epoch of the Early Silurian period. Long thought of as a "basal anaspid," ''J. kerwoodi'' is now recognized as the best-known member of the H ...'' White 1946 *** †'' Jamoytius kerwoodi'' White 1946 References * A New Interpretation of Jamoytius Kerwoodi White. Alexander Ritchie, Nature, volume 188, pages 647–649 (19 November 1960), External links Prehistoric jawless fish orders [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anaspidomorphi
Anaspidomorphi (anaspidomorphs) is an extinct superclass of jawless fish. According to the newer taxonomy based on the work of Nelson, Grande and Wilson 2016 and van der Laan 2018, the phylogeny of Anaspidomorphi looks like this: * Superclass †Anaspidomorphi ** Order † Euphanerida *** Family † Euphaneropidae Woodward 1900 ** Order †Jamoytiiformes Halstead-Tarlo 1967 *** Family † Achanarellidae Newman 2002 *** Family † Jamoytiidae White 1946 ** Class †Anaspida Janvier 1996 non Williston 1917 *** Order †Endeiolepidiformes Berg 1940 **** Family †Endeiolepididae Stensio 1939 *** Order †Birkeniiformes Birkeniiformes (Birkeniida or Birkeniids) is an extinct order of jawless fish belonging to the class Anaspida. Subtaxa A newer taxonomy based on the work of Mikko's Phylogeny Archive, Nelson, Grande and Wilson 2016 and van der Laan 2018. * Ge ... Stensiö 1964 **** Family † Pharyngolepididae Kiær 1924 **** Family † Pterygolepididae Obručhev 1964 **** Famil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, 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 Symmetry in biology#Bilate ... [...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] |
Vertebrata
Vertebrates () comprise all animal taxa within the subphylum Vertebrata () ( chordates with backbones), including all mammals, birds, reptiles, amphibians, and fish. Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,963 species described. Vertebrates comprise such groups as the following: * jawless fish, which include hagfish and lampreys * jawed vertebrates, which include: ** cartilaginous fish (sharks, rays, and ratfish) ** bony vertebrates, which include: *** ray-fins (the majority of living bony fish) *** lobe-fins, which include: **** coelacanths and lungfish **** tetrapods (limbed vertebrates) Extant vertebrates range in size from the frog species ''Paedophryne amauensis'', at as little as , to the blue whale, at up to . Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns. The vertebrates traditionally include the hagfish, which do n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
