deuterostome


Also found in: Dictionary, Encyclopedia, Wikipedia.

deuterostome

(do͞o′tə-rō-stōm′)
n.
Any of a numerous animals of the group Deuterostomia, in which the anus develops from the first opening in the embryo and the mouth develops later, and including the echinoderms, hemichordates, and chordates.
References in periodicals archive ?
The central nervous system in deuterostomes lies on the dorsal side, but on the ventral side in protostomes, such as the lobster.
From the basic bilaterian plan, two developmental groups of organisms evolved namely deuterostomes (echinoderms and chordates) and the protostones (almost everything else).
For example, humans are included in the following nested clades (using the informal names): eukaryotes, animals, deuterostomes, vertebrates, gnathostomes, tetrapods, amniotes, mammals, eutherians, primates, monkeys, apes, and great apes (see Dawkins, 2004 for more information on the ancestry of humans).
The echinoid immune system and the phylogenetic occurrence of immune mechanisms in deuterostomes.