How To Use Amphioxus In A Sentence
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Thus amphioxus is the only chordate species in which distinct insulin and IGF genes have not been found.
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However, temporal colinearity of Hox gene expression and compact Hox clusters have so far only been described in the cephalochordate, amphioxus, and in vertebrates, but not in Cnidaria, Lophotrochozoa, or Ecdysozoa.
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We have already pointed out (Chapter 1.9) how the epigastrula of the mammals (Figure 1.67) can be reduced to the original type of the bell-gastrula, which is now preserved by the amphioxus alone (Figure
The Evolution of Man — Volume 2
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One group, including amphioxus, lampreys, sturgeons and amphibians, displays the primitive condition, with holoblastic eggs and involution of the endoderm through a blastopore.
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The cephalochordate amphioxus is the closest living invertebrate relative of the vertebrates and therefore the best model organism for understanding the composition of the ancestral chordate genome.
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Amphioxus is the closest living invertebrate relative of the vertebrates, and is key to understanding the evolution of vertebrates from an invertebrate ancestor.
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Organisms along the lines of the cephalochordate amphioxus use the gill apparatus for filter feeding.
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FGFRL1, the gene for the fifth member of the fibroblast growth factor receptor (FGFR) family, is found in all vertebrates from fish to man and in the cephalochordate amphioxus.
BioMed Central - Latest articles
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In the direct development Bateson showed that the three divisions of the coelom arise as pouches constricted off from the archenteron or primitive gut, thus resembling the development of the mesoblastic somites of _Amphioxus_.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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Amphioxus has only a primitive proto-spinal column called a notochord, but it is a very close relative of the vertebrates.
NPR Topics: News
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The ideal figure of the vertebrate as given in Figures 1.98 to 1.102 is a hypothetical scheme or diagram, that has been chiefly constructed on the lines of the amphioxus, but with a certain attention to the comparative anatomy and ontogeny of the ascidia and appendicularia on the one hand, and of the cyclostoma and selachii on the other.
The Evolution of Man — Volume 1
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In the invertebrate cephalochordate Amphioxus, there is a family of very immunoglobulin like-molecules, Variable domain Chitin Binding Proteins, which are involved in innate immunity.
Stuck on you, biological Velcro and the evolution of adaptive immunity - The Panda's Thumb
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The Amphioxus has no gene for fibrinogen, the final step in the modern clotting cascade, yet it still clots its haemolymph.
The Panda's Thumb: Ian Musgrave Archives
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Amphioxus is a primitive chordate, more primitive than lampreys, that clot their haemolymph.
The Panda's Thumb: Ian Musgrave Archives
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For this interesting animal, extensive morphological and developmental biological studies have been conducted, but limited information has been available on endocrinology and physiology of amphioxus.
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Here he adopts the investigations of A. Kowalewsky, and the deductions of Häckel founded upon them, concerning the larva of the ascidiæ, a genus of marine mollusca of the order tunicata, and sees in a cord, to be found in this larva, most decided relationship to the spine of the lancelet fish or amphioxus, the lowest of all the vertebrates, it being yet doubtful whether it belongs at all to the vertebrates.
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
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The young amphioxus has, at this stage, which is called the gastrula stage, a curious parallelism with such a lowly form as the
Text Book of Biology, Part 1: Vertebrata
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_Amphioxus_ the reverse is the case; (b) the tongue-bar contains a large coelomic space in _Balanoglossus_, but is solid in _Amphioxus_; (c) the skeletal rods in the tongue-bars of _Balanoglossus_ are double; (d) the tongue-bar in _Balanoglossus_ does not fuse with the ventral border of the cleft, but ends freely below, thus producing a continuous U-shaped cleft.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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The blastosphere of the frog is like what the blastosphere of amphioxus would be, if the future hypoblast cells were enormously larger through their protoplasm being diluted with yolk.
Text Book of Biology, Part 1: Vertebrata
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Hence in the light of the gastraea theory we must regard the features of the amphioxus as the only and real primitive structure among all the vertebrates, departing very little from the palingenetic embryonic form.
The Evolution of Man — Volume 1
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In the middle is a cephalochordate, Amphioxus, also a filter feeder, but capable of free swimming.
Ascidian evo-devo - The Panda's Thumb
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The same kind of coelom-formation as in sagitta was afterwards found by Kowalevsky in brachiopods and other invertebrates, and in the lowest vertebrate -- the amphioxus.
The Evolution of Man — Volume 1
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Single forms were cloned from dogfish shark, greenland shark, both lamprey species, hagfish, and amphioxus.
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Technically an invertebrate, amphioxus is classified in subphylum Protochordata, phylum Chordata.
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Such a gastrula, formed mainly by overgrowth of the epiblast, is called an epibolic gastrula, as distinguished from the invaginate gastrula of amphioxus.
Text Book of Biology, Part 1: Vertebrata
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In going from amphioxus to jawless fish to jawed fish to land vertebrates we see an increase in complexity of the clotting cascade:
Behe's Test
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A few years ago, some molecular embryology data on amphioxus have revived the long forgotten hypothesis that the ancestor of coelomates was a segmented animal.
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Amphioxus (Lancelet) - Amphioxus, also called lancelet, is a small marine animal resembling a miniature fish without eyes (or even a head), which is found widely in coastal waters around warmer parts of the world.
Undefined
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Amphioxus, a cephalochordate, widely considered as the closest living invertebrate relatives of the vertebrates.
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Amphioxus is a primitive chordate, more primitive than lampreys, that clot their haemolymph.
The Panda's Thumb: Ian Musgrave Archives
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Amphioxus has only a primitive proto-spinal column called a notochord, but it is a very close relative of vertebrates.
NPR Topics: News
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The gastraea theory shows us how to do this, by representing the embryology of the lowest vertebrate, the skull-less amphioxus, as the original form, and deducing from it, through a series of gradual modifications, the gastrulation and coelomation of the craniota.
The Evolution of Man — Volume 1
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_Amphioxus_, subordinate to the primary bars in size, vascularity and development; finally, in the craniate vertebrates it would then have completed its involution, the suggestion having been made that the tongue-bars are represented by the thymus-primordia.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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Expression is also detected variously in visceral endoderm, and anterior mesoderm and endoderm of the gut and pharynx in some vertebrates and amphioxus.
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Enteropneusta exhibit chordate (vertebrate) affinities in respect of the coelomic, skeletal and nervous systems as well as in regard to the respiratory system, and, further, that the gill-slits are formed upon a plan similar to that of the gill-slits of _Amphioxus_, being subdivided by tongue-bars which depend from the dorsal borders of the slits.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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The cephalochordates include only about twenty species of two genera of organisms commonly called amphioxus.
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Amphioxus, also known as the lancelet, diverged from vertebrates more than 500 million years ago, and is often studied by researchers hoping to learn more about the early history of vertebrates.
NPR Topics: News
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Such a gastrula, formed mainly by overgrowth of the epiblast, is called an epibolic gastrula, as distinguished from the invaginate gastrula of amphioxus.
Text Book of Biology, Part 1: Vertebrata