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Topics related to "Chordate"

Hemichordata
Hemichordata , small phylum of marine invertebrates closely related to both the echinoderms (phylum Echinodermata ) and chordates (phylum Chordata ). Acorn worms, class Enteropneusta, are the most common hemichordates. The body is composed of an anterior, conical proboscis, a short collar, and a l... Read more
lancelet
lancelet name for small, fishlike lower chordate (see Chordata ), also called amphioxus; it shows many affinities with the vertebrates. There are about 30 lancelet species, most belonging to the genus Brachiostoma (formerly Amphioxus ). Lancelets are usually about 1 in. (2.5 cm) long, with tran... Read more
Chordata
Chordata , phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals. The three features uniqu... Read more
Central Nervous System
Central Nervous System The central nervous system (CNS) consists of a brain and spinal (nerve) cord. Most invertebrates and all vertebrates have sensory and motor neurons that are linked by way of a CNS. Most invertebrates have a CNS that is organized into a brain and a longitudinal nerve cord th... Read more
animal
animal any member of the animal kingdom (kingdom Animalia), as distinguished from organisms of the plant kingdom (kingdom Plantae) and the kingdoms Fungi , Protista , and Monera in the five-kingdom system of classification. (Another classification system, suggested by genetic sequencing studi... Read more
tunicate
tunicate , marine animal of the phylum Chordata , which also includes the vertebrates. The adult form of most tunicates (also called urochordates) shows no resemblance to vertebrate animals, but such a resemblance is evident in the larva. The most familiar tunicates are the sea squirts, or ascidian... Read more
fish
fish limbless aquatic vertebrate animal with fins and internal gills. There are three living classes of fish: the primitive jawless fishes, or Agnatha; the cartilaginous (sharklike) fishes, or Chondrichthyes; and the bony fishes, or Osteichthyes. These groups, although quite different from one anot... Read more
fish
fish limbless aquatic vertebrate animal with fins and internal gills. There are three living classes of fish: the primitive jawless fishes, or Agnatha; the cartilaginous (sharklike) fishes, or Chondrichthyes; and the bony fishes, or Osteichthyes. These groups, although quite different from one anot... Read more

Encyclopedia entries related to "Chordate"

Chordates
Encyclopedia entry from: The Gale Encyclopedia of Science ...Other defining features of chordates are the presence of pharyngeal...the more recently evolved chordates, such as the vertebrates. Chordate animals have a closed circulatory...systemic circulation). Most chordates have two sexes, and the...
chordates
Book article from: The Oxford Companion to the Earth ...show the full complement of chordate characters. The cephalochordates...about 7 cm long) in which the chordate characters are retained in...Although they retain the chordate characters as adults gill...of cell division shows that chordates are most closely related to...
chordate
Book article from: World Encyclopedia chordate Any member of the Chordata, a large phylum of vertebrates and some marine...like, cartilaginous supporting structures ( notochords ). Invertebrate chordates are divided into three subphyla: tunicates (seasquirts); Cephalochordata...
Chordata
Book article from: The Columbia Encyclopedia, Sixth Edition ...three features unique to chordates and found in all of them...shows affinities with chordates and has sometimes been considered a chordate subphylum, but is now often...show affinities to other chordates only in the juvenile stage...
Arrow worms
Encyclopedia entry from: The Gale Encyclopedia of Science ...vertebrates), but they lack many important chordate characteristics. Nevertheless, arrow...cavity), which is a characteristic of chordates and the phylum Protochordata. In arrow...the phylum Chordata. However, most chordates have a coelom that arises in a different...
vertebrates
Book article from: The Oxford Companion to the Earth ...the phylum Chordata and retain the chordate characters of a notochord (a longitudinal...successful and widespread than their chordate relatives the urochordates and cephalochordates. These lower chordates are marine filter-feeders, and it...
lancelet
Book article from: The Columbia Encyclopedia, Sixth Edition lancelet name for small, fishlike lower chordate (see Chordata ), also called amphioxus; it shows many affinities...feeding rather than respiration is characteristic of the lower chordates (see tunicate ). The lancelet has a dorsal notochord, or...
Hemichordata
Book article from: The Columbia Encyclopedia, Sixth Edition ...related to both the echinoderms (phylum Echinodermata ) and chordates (phylum Chordata ). Acorn worms, class Enteropneusta...a hollow nerve cord in the collar suggest relationship to chordates, while the ciliated larvae are similar to those of echinoderms...
Burgess shale
Book article from: World Encyclopedia ...Cambrian period. The silt has preserved traces of many of the soft bodies of sea creatures. The fossils include the oldest known chordate – a forerunner of all animals with backbones. They also include a number of kinds of animals that have completely...
notochord
Book article from: World Encyclopedia notochord In chordates , such as acorn worms, and the early embryonic stages of vertebrates, the flexible, primitive backbone; in mature vertebrates it is replaced by the spine .

Dictionary entries related to "Chordate"

chordate
Book article from: The Oxford Pocket Dictionary of Current English ...phylum Chordata, including all vertebrates as well as the invertebrate sea squirts and lancelets, distinguished by the possession of a notochord at some stage during their development. • adj. of or related to the chordates.
Chordata
Book article from: A Dictionary of Biology ...Cephalochordata (lancelets), Agnatha (jawless chordates), and Gnathostomata (jawed chordates). In the Agnatha and Gnathostomata, commonly...status of phyla and the jawed and jawless chordates are included together in a third phylum...
Hemichordata
Book article from: A Dictionary of Zoology ...The hemichordates are related to the chordates ( Chordata ), for although they lack...to the dorsal, hollow nerve cord of chordates. Hemichordates are exclusively marine...Echinodermata ; the link between echinoderms and chordates is supported by biochemical evidence...
Beneden, Edouard Van
Dictionary entry from: Complete Dictionary of Scientific Biography ...shown to everyone ’ s surprise, that tunicates were chordates. They therefore were excellent material for studies in comparative...pericardium of tunicates is the ultimate remainder of the chordate celom. Van Beneden ’ s most famous contributions...
Homalozoa
Book article from: A Dictionary of Earth Sciences ...similarities between the larvae of some echinoderms and some chordates ( Chordata ) has led to the suggestion that the phyla are...Jeffries on morphological grounds to a new subphylum of primitive chordates, the Calcichordata. The matter remains unresolved.
Castle, William Ernest
Dictionary entry from: Complete Dictionary of Scientific Biography ...gastrula. Castle took issue with the prevailing view of the origin of the chordate mesoderm. He concluded correctly that the mesoderm in Ciona and other primitive chordates originates from pouches in the infolded endoderm of the gastrula, in a...
Urochordata
Book article from: A Dictionary of Earth Sciences ...Subphylum comprising the seasquirts, with reliable fossils from the Permian , and possible remains in Silurian sediments . Sea-squirts have tadpole-like larvae with notochords in their tails, a feature that links them with the chordates .
Amphibia
Book article from: A Dictionary of Ecology Amphibia( amphibians ) A chordate class represented today by just three groups, of which the salamanders (Urodela) and frogs and toads (Anura) are the best...
Pikaia
Book article from: A Dictionary of Zoology Pikaia An early chordate ( Chordata ) from the Burgess Shale that was possibly related to the modern amphioxus (see BRANCHIOSTOMIDAE ).
Aves
Book article from: A Dictionary of Biology Aves The birds: a class of bipedal vertebrate chordates (see Chordata ) with feathers , wings, and a beak. They evolved from reptilian ancestors, probably in the Jurassic period...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Early kin of vertebrates found in China. (fossil of Cathaymyrus diadexas found in southwest China may be oldest known chordate)(Brief Article)
Magazine article from: Science News; 11/16/1996; ; 700+ words ; ...a number of key chordate features, according...primitive living chordates such as amphioxus...structure in primitive chordates that is related...the only potential chordate from Chengjiang...the earliest known chordate (SN: 2/3/96...different today, chordates are often linked...
A REDESCRIPTION OF A RARE CHORDATE, METASPRIGGINA WALCOTTI SIMONETTA AND INSOM, FROM THE BURGESS SHALE (MIDDLE CAMBRIAN), BRITISH COLUMBIA, CANADA
Magazine article from: Journal of Paleontology; 3/1/2008; ; 700+ words ; ...the Chengjiang Lagersttte, chordates (or indeed cephalochordates...1998) and the much rarer chordate described herein. Apart from...The general scarcity of chordates in Burgess Shale-type deposits...to the record of Cambrian chordates. It is not known in which...
Particle retention and flow in the pharynx of the enteropneust worm Harrimania planktophilus: the filter-feeding pharynx may have evolved before the chordates.
Magazine article from: The Biological Bulletin; 4/1/2002; ; 700+ words ; ...hold clues concerning early chordate pharyngeal evolution, but...1986), hemichordates, and chordates. In enteropneusts they are...and Barnes, 1994). The chordate pharynx, on the other hand...pharynx is a synapomorphy of the chordates, and suggest that it may...
Cell signaling and transcription factor genes expressed during whole body regeneration in a colonial chordate.(Research article)(Report)
Magazine article from: BMC Developmental Biology; 10/12/2008; ; 700+ words ; ...As the capacity for wide-range regeneration is limited in chordates [9], WBR may be used as a model system for studying the...Figure 1: Whole body regeneration (WBR) in the colonial chordate Botrylloides leachi . A : A B. leachi colony with numerous...
The evolutionary differentiation of two histone H2A.Z variants in chordates (H2A.Z-1 and H2A.Z-2) is mediated by a stepwise mutation process that affects three amino acid residues.(Research article)(Report)
Magazine article from: BMC Evolutionary Biology; 2/4/2009; ; 700+ words ; ...that H2A.Z-1 and H2A.Z-2 represent two very closely related variants that share a common evolutionary origin early in chordate evolution. Furthermore, our results show that the evolutionary constraints leading to the differentiation of both variants...
Improved genome assembly and evidence-based global gene model set for the chordate Ciona intestinalis : new insight into intron and operon populations.(Research)
Magazine article from: Genome Biology (Online Edition); 10/14/2008; ; 700+ words ; ...10]; Erika Lindquist [11]; Toshinori Endo [2]; Kohji Hotta [12]; Kazuo Inaba [4] Background The tunicates are a chordate sister group of the vertebrates that has long been of great interest to evolutionary and developmental biologists. Vertebrates...
LRRCE: a leucine-rich repeat cysteine capping motif unique to the chordate lineage.(Research article)(Report)
Magazine article from: BMC Genomics; 12/12/2008; ; 700+ words ; Authors: Hosil Park [1]; Julie Huxley-Jones [1,3]; Ray P Boot-Handford [1]; Paul N Bishop [1]; Teresa K Attwood [2]; Jordi Bella (corresponding author) [1] Background The leucine-rich repeat (LRR) is a widespread structural motif of 20-30 amino acids easily identifiable at the primary structure
cDNA sequences for transcription factors and signaling proteins of the hemichordate saccoglossus kowalevskii: efficacy of the expressed sequence tag (EST) approach for evolutionary and developmental studies of a new organism.(complementary deoxyribonucleic acid)
Magazine article from: The Biological Bulletin; 6/1/2008; ; 700+ words ; ...important for comparisons to chordates because of their evolutionary...sister group of the chordate phylum, which includes...sister group of all other chordates and Xenoturbella as...FIGURE 1 OMITTED] Since chordates develop directly, we...hemichordates, its probable chordate-like ...
Isolation and characterization of endostyle-specific genes in the ascidian Ciona intestinalis.
Magazine article from: The Biological Bulletin; 8/1/1998; ; 700+ words ; ...In addition, lower chordates (including tunicates...these hallmarks of the chordate body plan apparently...understand the origin of chordates. Coincidently with...most of the primitive chordates or chordate ancestors may have shifted...
Thyroid hormone receptor orthologues from invertebrate species with emphasis on Schistosoma mansoni.(Research article)(Report)
Magazine article from: BMC Evolutionary Biology; 8/29/2007; ; 700+ words ; ...to be an innovation of chordates as the genomes of insects...are present outside of chordates. However, it is still...NTSS). In non-chordate TR homologues, it is PYIPSYMXXXGPEEP; while in chordate NTSS, three amino acids...