deuterostomes Animals in which the first opening that appears in the embryo becomes the anus while the mouth appears at the other end of the digestive system. Main groups include chordates and echinoderms.
Superb Fairy-wren, Malurus cyaneus
s differ from the other Bilateria, called protostomes, in several ways. In both cases there is a complete digestive tract.
deuterostomes A group of Metazoans that exhibit indeterminate, radial cleavage and that develop a mouth independent of, and at some distance from, the blastopore. (Echinoderms and Chordates and related minor phyla).
s - broad classification of triploblastic animals including echinoderms and chordates that tend to share certain embryological traits; among these the formation of the "mouth second" (hence the name) during gastrulation, ...
Deuterostomes differ from the other Bilateria, called protostomes, in several ways. In both cases there is a complete digestive tract.
The features of these animals are listed above. The most prominent members of this group belong to the echinoderms and the chordates.
Echinoderms (Phylum Echinodermata)
Deuterostomes (as exemplified by the echinoderms and chordates) develop the anus first, then the mouth at the other end of the embryo. Deuterostomes are coelomate animals these embryological characteristics: ...
s, on the other hand, exhibit radial cleavage in which the blastomeres divide perpendicular or parallel to one another and are
Development in protostomes and s.
deuterostomes Animals in which the anus forms from, or in the region of, the blastopore; often characterized by enterocoelous coelom formation, radial cleavage, and the presence of a dipleurulalike larval stage.
The s differ from the Protostomes in various ways. They also have a complete digestive tract, but in this case the archenteron develops into the anus.
Many deuterostomes undergo radial cleavage in which the cleavage planes are parallel or perpendicular to the vertical egg axis.
There is a widespread perception that ecdysozoans have lost more of the ancestral gene set than have s or lophotrochozoans.
A type of embryonic development in deuterostomes in which the planes of cell division that transform the zygote into a ball of cells are either parallel or perpendicular to the polar axis, thereby aligning tiers of cells one above the other.
Pascual-Anaya, J., D'Aniello, S., Kuratani, S. & Garcia-Fernandez, J. (2013). Evolution of Hox gene clusters in s. BMC Developmental Biology, 13(26). doi:10.1186/1471-213X-13-26 ...
See also: Organ, Animal, Character, Animals, Cells