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Lepospondyli

Lepospondyli Group of small Palaeozoic amphibians, distinguished by the possession of vertebrae with spool- shaped centra below the neural arches. Each centrum (the massive part of the vertebra) was perforated lengthwise, providing a channel for the notochord. The lepospondylous, or ‘husk’, vertebra also occurs in living amphibians, but its evolutionary derivation is unclear.

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"Lepospondyli." A Dictionary of Earth Sciences. . Encyclopedia.com. 13 Dec. 2017 <http://www.encyclopedia.com>.

"Lepospondyli." A Dictionary of Earth Sciences. . Encyclopedia.com. (December 13, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/lepospondyli

"Lepospondyli." A Dictionary of Earth Sciences. . Retrieved December 13, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/lepospondyli

Lepospondyli

Lepospondyli (class Amphibia) A group of small, Palaeozoic amphibians in which the vertebrae have spool-shaped centra (see CENTRUM) below the neural arches. The centra were each perforated lengthwise, providing a channel for the notochord. The lepospondylous, or ‘husk’, vertebra also occurs in living amphibians, but its evolutionary derivation is unclear.

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"Lepospondyli." A Dictionary of Zoology. . Encyclopedia.com. 13 Dec. 2017 <http://www.encyclopedia.com>.

"Lepospondyli." A Dictionary of Zoology. . Encyclopedia.com. (December 13, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/lepospondyli-0

"Lepospondyli." A Dictionary of Zoology. . Retrieved December 13, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/lepospondyli-0

Microsauria

Microsauria A group of very small, Carboniferous and Permian amphibians that are thought to be ancestral to the modern Apoda.

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"Microsauria." A Dictionary of Zoology. . Retrieved December 13, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/microsauria