THE VERTEBRATES Chordates (phylum Chordata) are
However, unlike echinoderms, chordates are characterized by a notochord, jointed appendages, and ... A flexible rod, the notochord, forms on the dorsal side of the primitive gut in the .... Primarily fruit- or insect-eaters; elongated fingers; thin ...
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Chapter 48: Vertebrates
The Chordates. Chordates have an internal flexible rod, ... 48.2 Nonvertebrate chordates have a notochord but no backbone. ... characterized by a flexible rod that develops along the back ...... Salamanders have elongated bodies, long tails ...
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Topic 16: Phylum Chordata
Phylum Chordata (chordates) [clade] – general features ... 2. notochord - flexible, fibrous rod along back (replaced by vertebrae in advanced ... 3. like vertebrates, muscles broken up into bands called myomeres (body segmentation) .... D. Order Urodela (Caudata) – salamanders – elongated body with tail; moist, smooth skin.
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Evolution of the notochord - Springer
... include some vertebrates. (especially elongate fishes ) and diverse invertebrates [2– ... skeleton is an internal rod, the notochord, which functions as a flexible ... vertebrate notochord is a legacy from non-chordate inver- tebrates, and the ...
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Vertebrate-like regeneration in the invertebrate chordate amphioxus
Jan 10, 2012 ... anterior and posterior structures, including neural tube, notochord, fin, and ... invertebrate chordate-vertebrate transition | stem cells | cephalochordate .... week 4, the regenerate fills out, continuing to elongate and ..... Kaneto S, Wada H ( 2011) Regeneration of amphioxus oral cirri and its skeletal rods:.
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The Annelid Ancestry of the Chordates and the Origin of the
of the Chordate Central Nervous System and the Notochord .... or to be more specific, the origin of the vertebrates. ..... the neural tube of chordates from the elongated stomodaeum of an annelid .... development of an internal skeletal rod.
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Phylum Lab - National Aquarium
Phylum Chordata. So, what ..... The Phylum Chordata includes a wide range of animals from tunicates that look ... (e.g., the vertebrates) is later replaced by a bony, vertebral column. ... Notochord- an elongate rod-like structure located above.
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Vertebrates - rcastilho.pt
attached to this rod allowed early chordates to swing their bodies from side to side, swimming through the water. This key .... In nearly all vertebrates, the notochord is replaced ...... Salamanders have elongated bodies, long tails, and smooth,.
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Hypotheses on the origin and early evolution of chordates in the
est lineages related with the evolution of vertebrates, mineralized tissues may have been .... far as chordates are concerned the notochord, which, in spite of its structural ..... Cells that were laterally elongated, and presumably low in profile, did not ..... togeny as organic rods with a glossy surface evidently surrounded by a ...
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stages in the origin of vertebrates: analysis by means of scenarios
(2) 'I'he notochord and relations among hemichordates and protochordates ..... arrangement in hcmichordates, chordates, protochordates and vertebrates ..... Bonik, 1981) and permits an ovoid animal to remain elongated without the ... Any stiffening and increase in mass of the appendage, such as by diverticulating a rod.
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Vertebrate Origin - Wiley
tough rod that runs along the length of the body down the back. ... 2 When did deuterostomes and chordates originate? 3 What are the key .... rod-like notochord. 1.2 PHYLUM .... branchial slits, and an elongate endostyle (Chen et al .,. 2003).
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chordates - National Open University of Nigeria
and vertebrate forms of chordates and the general outline of their classification. .... i) a notochord (a dorsal fairly rigid rod of vacuolated cells) or a vertebral column ..... The proboscis is not elongated, as in acorn worms, but shield- shaped .
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High-precision morphology: bifocal 4D-microscopy - Hu-berlin.de
of detailed cell lineages of two chordate ... considered to be close relatives of vertebrates, are marine invertebrates whose fossil record dates back to .... asymmetry in the lineage of the notochord. ... ive notochordal cells A7.3/A7.3, and the prospective neural .... rod-like array along the anteroposterior axis during gastrula-.
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Animal Diversity: Chordata
This pliant, rod-like structure ... large group, embracing chordates having a brain; endoskeleton; notochord not extending ... Amphibians are the first vertebrates to live on land, ... In water, an elongated fishlike body, propelled by a muscular.
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chongmague reveals an essential role for laminin-mediated
Nov 21, 2007 ... In vertebrates, CE movements are most pronounced in the tissues that ... We use the ascidian Ciona savignyi as a model for chordate axial morphogenesis ... notochord cell behavior, the notochord cells do form a rod-like structure and .... border, with many lateral cells elongated along the anteroposterior.
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Yunnantozoon and the ancestry of chordates - Agro
genetic tree of early chordates and vertebrates necessary. Yunnanozoon liuidum Hou ... in them branchial arches, notochord, and metameric gonads. These basic ..... triangular segment of the unit is of strangely antero-posteriorly elongated shape. There is .... enteropneusts. However, the'branchial skeletal rods of the enter- ...
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Article - eLife
Oct 21, 2015 ... In cytokinesis of vertebrate cells, the equatorial ring is established in many incidences .... elongate to form the rod-like notochord, which stretches from the ...... Ascidians have the simplest notochord in the Chordate phylum.
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Develop. Growth Differ.
In vertebrates, Brachyury is initially expressed in the ... is critical for notochord differentiation in all vertebrates that have ... most simplified and primitive chordate body plan ..... into an elongated rod surrounded by a sheath of fibrous materials ...
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The cellular and molecular mechanisms of the notochord
itself around a central space to enclose the lumen, for example in vertebrate .... in the Ciona notochord, the tube develops from a single rod of cells and the lumens are ... structure called the notochord, a major shared feature of chordates. .... notochord cells elongate along the body axis and narrow medially, resulting in a ...
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Invertebrate Nervous Systems
vertebrates, yet these animals solve all of the same survival problems, can live in ..... lancelets, are grouped with the vertebrates as chordate animals, and give ...
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