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Deuterostomia

Deuterostomia The name sometimes given to a number of animal phyla (Chordata, Hemichordata, Pogonophora, Echinodermata, and Chaetognatha) thought by many to share a common ancestry. The name indicates the mode of formation of the mouth opening in embryogeny: the first embryonic opening (the blastopore) becomes the anus, and the second opening becomes the mouth. Compare PROTOSTOMIA.

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Xenoturbellida

Xenoturbellida A phylum known by only a single species, Xenoturbella bocki, found in the N. Sea and described in 1949 by E. Westblad. It is up to 30 mm long, hermaphrodite, and ciliated (cilium); it has no anus, but is coelomate.

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"Xenoturbellida." A Dictionary of Zoology. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/xenoturbellida