Deuterostomia

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Deuterostomia

[‚düd·ə·rō′stō·mē·ə]
(zoology)
A division of the animal kingdom which includes the phyla Echinodermata, Chaetognatha, Hemichordata, and Chordata.

Deuterostomia

 

an inclusive term comprising animals of the three phyla Hemichordata, Echinodermata, and Chordata. The term “Deuterostomia” was introduced into the system of animal classification by the German zoologist K. Grobben in 1908. In contrast to the Protostomia, deuterostomes form a new mouth opening during their embryonic development that is independent of the protostoma, or blastopore (the latter usually becoming the anus). Deuterostomia have a secondary body cavity, or coelom, which develops from an out-pouching of the intestine. The endoskeleton is of mesodermal origin. The nervous system takes the form of an ectodermal plate with in-pouchings under the skin. The biochemistry of muscle contraction in Deuterostomia is characterized by the formation of creatine phosphate. The phyla Chaetognatha and Pogonophora are now also included among the Deuterostomia.

A. V. IVANOV

References in periodicals archive ?
Most animal phyla belong to one of two groups of bilaterians: the protostomes or deuterostomes.
Could it be that the ancestor of the deuterostomes was a bottom-feeding dweller in the dark?
Although PPAR has not been described outside deuterostomes, RXR is ubiquitous within metazoans.