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 ?
Our team has notched up some important discoveries in the past, including the earliest fish and a remarkable variety of other early deuterostomes," co-author Degan Shu from Northwest University in China, said in the statement.
A newly described group of primitive soft-bodied deuterostomes, called vetulocystids, bears similarities to some of the bizarre early echinoderms.
The central nervous system in deuterostomes lies on the dorsal side, but on the ventral side in protostomes, such as the lobster.
By comparing multiple alignments of the predicted amino acid sequence of BsGPx5 with other deuterostome GPx, we identified two conserved amino acids of the active sites involved in catalytic activity in other deuterostomes ([Gin.
While it has been variously suggested that deuterostomes (Nursall, 1962), protostomes (Inglis, 1985), and cnidarians (Hanson, 1977) independently evolved multicellularity, the group most commonly considered to have been derived from a separate protist lineage is the sponges, phylum Porifera (as evidenced by Barnes, 1980, p.
Indeed, a recently published analysis of deuterostome aquaporins suggests that the Atlantic salmon may express more aquaporin paralogs than any other animal analyzed (Finn et al.
Hemichordates, a small marine phylum integral to hypotheses on deuterostome and chordate evolution, occur throughout the world's oceans.
The seemingly sporadic distribution of the different SNBP types is the result of this transition having occurred repeatedly in the course of evolution (Kasinsky, 1995) within different groups of both the deuterostome and protostome branches (Ausio, 1999; Eirin-Lopez et al.
The NK cluster in the last common ancestor to protostomes and deuterostomes probably contained a cluster of nine NK genes: Msx, NKl/slouch, NK3/bagpipe, NK4/tinman, Tlx/cl5, NK7, NK6/hgtx, NK5/Hmx, and Lbxl ladybird genes (Holland 2001, Garcia-Fernandez 2005, Larroux et al.
Although PPAR has not been described outside deuterostomes, RXR is ubiquitous within metazoans.