Plants and Animals
Zoology and Veterinary Medicine
Zoology: General
periderm

periderm

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views updated May 08 2018

periderm The thin, sheet-like material that makes up the skeleton in graptolites (Graptolithina). Long thought to be chitin, it is now considered perhaps to be collagen (a scleroprotein). It is bi-layered, with an inner fusellar layer and outer cortical layer which have distinct structural differences.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

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periderm

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views updated Jun 08 2018

periderm See cork cambium.

A Dictionary of Biology

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periderm

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views updated May 14 2018

periderm See BARK.

A Dictionary of Plant Sciences MICHAEL ALLABY

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periderm

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views updated May 18 2018

periderm In invertebrates, the thin sheets of material that make up the skeleton.

A Dictionary of Zoology MICHAEL ALLABY

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