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.
Box gene expression in the hemichordate Saccoglossus kowalevskii and the evolution of deuterostome nervous systems.
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.
Although it is hypothesized that TIMELESS and its paralog TIMEOUT were both present early in animals, TIMELESS has been lost in lineages leading to Caenorhabditis elegans and deuterostomes (Li et ai, 2016).
As regards the phylogenetic reconstruction of deuterostome GPxs, BsGPx5 clusters together with C.
To infer the phylogenetic relationships of CrAQP with other AQP grades already recognized as occurring in parazoan, cnidarian, or basal deuterostome subclusters, we used the dataset and alignment computed by Finn and colleagues to build the tree presented in figure S4 of their 2014 paper (Finn et al., 2014).
Amongst basal Metazoa, including sponges (Porifera), corals, and sea anemones (Cnidaria), the origins of four major grades of aquaporins present in deuterostome organisms have been resolved via Bayesian inference (Finn et al., 2014).
A recent extensive phylogenetic analysis of deuterostome genomic data, however, revealed that the vertebrate superfamily contains 17 classes of aquaporins (Aqp0 - Aqpl6; Finn et al., 2014).
Classification and molecular phylogeny of deuterostome AQPs were recently advanced by massive Bayesian analysis (Finn et al.,, 2014).
Echinoderms, deuterostome animals, are one of these groups.
Hemichordates, a small marine phylum integral to hypotheses on deuterostome and chordate evolution, occur throughout the world's oceans.