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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Opdyke, Irene Gut 1918-2003 , o·pen / ˈōpən/ • adj. 1. allowing access, passage, or a view through an empty space; not closed or blocked up: it was a warm evening and the window w… nares , nar·es / ˈne(ə)rēz/ • pl. n. (sing. nar·is / ˈne(ə)ris/ ) Anat. & Zool. the nostrils. DERIVATIVES: nar·i·al / -ēəl/ adj.
nares (nostrils) The paired… Anus , anus •pandanus •badness, madness, sadness •Magnus • aptness •fatness, patness •redness • wetness •anus, Coriolanus, heinous, Janus, Punta Arenas, Sil… Tunicate , tunicate (tōō´nəkĬt), marine animal of the phylum Chordata, which also includes the vertebrates. The adult form of most tunicates (also called urocho… Gape , gape / gāp/ • v. [intr.] stare with one's mouth open wide, typically in amazement or wonder: they gaped at her as if she were an alien. ∎ be or becom… Monophyletic , monophyletic In systematics, describing a group of organisms that contains all the descendants of a particular single common ancestor. In cladistics…
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Deuterostomes
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Deuterostomes