Cephalochordata Chordata Animalia Flora and Fauna
Cephalochordata Chordata Animalia Flora and Fauna
Cephalochordates are non-vertebrate members of the Phylum Chordata, having diverged from the evolutionary line leading to the vertebrates before the end of the Precambrian. A cephalochordate has no head, a transparent body like a leaf with a notochord running from end to end, and rows of muscle on either side by which to wriggle, swim or bury itself. They are commonly known as lancelets.
Top: Science: Biology: Flora and Fauna: Animalia: Chordata: Cephalochordata
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The Amphioxus Song - A song, set to the tune of “It’s a long way to Tipperary”, that explains in verse the evolutionary development of vertebrates from invertebrates.
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Invertebrate Anatomy OnLine: Branchiostoma - Detailed illustrated anatomical description of amphioxus and the lancelets.
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Branchiostoma in coarse sand - Information on several species that live in sand at moderate depths off the coast of Devon, UK, and photographs of the lancelet (Branchiostoma lanceolatum) and the pea urchin (Echinocyamus pusillus).
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Amphioxus: A Peaceful Anchovy Fillet to Illuminate Chordate Evolution - Illustrated article on amphioxus, a species which occupies a central place in evolutionary thoughts when considering the origin of vertebrates.
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Lancelet - Photograph of Branchiostoma lanceolatum and information from Wikipedia on the genus, traditionally known as amphioxus, its physical features and taxonomy.
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Subphylum Cephalochordata - Information on this group and the three characteristic chordate features, the notochord, the dorsal nerve cord and the pharyngeal slits.
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Amphioxus Embryonic Development - A fascinating short movie from YouTube showing the early cell divisions in the egg and its subsequent development.
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Introduction to the Cephalochordata - Illustrated description of these primitive chordates, which are small, eel-like, unprepossessing animals that spend much of their time buried in sand.
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Animalia: Cephalochordata - Illustration of Branchiostoma.
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