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Topic: Deuterostomia

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In the News (Tue 19 Mar 19)

  Introduction to the Deuterostomia
The Deuterostomia comprise one of the major groups within the animal kingdom, and it is probably the most familiar to you, since you are a deuterostome!
In the Protostomia, which is the other major group of the Bilateria, the mouth develops from the edge of this pocket, where the inner and outer layer of cells meet; the anal opening develops later.
In the Deuterostomia, the reverse is true; the pocket edge develops into the anus, and the mouth is formed later.
www.ucmp.berkeley.edu /phyla/deuterostomia.html   (584 words)

  Palaeos Invertebrates: Deuterostomia
The name Deuterostomia ("second mouth") refers to the development of the embryo blastopore into the anus, with the mouth developing as a secondary opening, in contrast to protostomes ("first mouth") with the process reversed.
Within the Deuterostomia, chordates and hemichordates were united by possession of ciliated pharyngeal gill pores/slits and a stiffened notochord-like structure (the notochord in chordates, the stomochord in hemichordates).
Deuterostomia is much lower down, probably the second branch of Bilateria to split off after the Acoelomorpha.
www.palaeos.com /Invertebrates/Deuterostomia/Deuterostomia.htm   (1998 words)

 Animal - Printer-friendly - ninemsn Encarta
For example, one such basic division is into the Protostomia, in which the embryonic mouth persists, and Deuterostomia, in which a new mouth is formed.
The ancestral bilaterian had a gut but no other body cavity; because of the absence of such a cavity, or coelom, the animal could be called an acoelomate.
These phyla are united mainly by developmental characteristics and may be related to the lophophorates, some of which also have an enterocoelous manner of forming the coelom.
au.encarta.msn.com /text_761558664___3/Animal.html   (871 words)

 Animal - ninemsn Encarta
Introduction; Origins and Relationships; Body Organization; The Parazoa; The Mesozoa; The Radiates; The Acoelomate Bilateria; The Pseudocoelomates; Eucoelomates: the Tentaculata; Eucoelomates: the Trochozoa; Eucoelomates: the Deuterostomia; Animals in the Ecosystem; Animals in the Human Community
The molluscs (phylum Mollusca) have reduced coeloms and little indication of segmentation, but they have a characteristic shell and soft body.
The Deuterostomia comprise the enterocoels—echinoderms, arrow worms, hemichordates, and chordates—the rest of the animal kingdom.
au.encarta.msn.com /encyclopedia_761558664_2/Animal.html   (739 words)

 Re: What are the 'advantages' of developing a deuterostome pattern of embryonic
The term "Deuterostomia" was coined by K. Grobben in 1908 as part of an attempt to apply order to the Metazoa (multicellular animals).
To further support the relatedness of Deuterostomia to the other clades, Recent evidence from rRNA homologies suggest that Deuterostomia arose from within the "higher invertebrate" group of Annelida, Mollusca, and Arthropoda, being closer to Mollusca and Annelida than to Arthropoda, and thus demoting Deuterostomia to a superphylum within Protostomia.
As far as 'advantages' of Deuterostomia over Protostomia, it is important to remember that Deuterostomes make up less than one percent of all animal species, with at least twice as many non-arthropod Protostomes as all Deuterostomes (Arthropoda accounts for about 85% of all metazoan species).
www.madsci.org /posts/archives/feb99/918160589.Dv.r.html   (799 words)

In deuterostomes, the opening develops into the anus, and the mouth is formed later.
The Deuterostomia include two large and diverse groups of animals: (i) the echinoderms and hemichordates (spiny-skinned ocean-dwelling creatures, including starfish and sea urchins) and (ii) the chordates (which include fish and other vertebrates).
Although there are molecular phylogenetic data to support this broad separation, scientists continue to debate the evolutionary relationships among the deuterostomes and the ancestry of chordates.
www.sciencemag.org /feature/data/tol/deuterostomia.html   (144 words)

 [No title]
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Finds both.Probably we remember all that is not separated and bottled up in Deuterostomia a measure justified in their conviction by the dull discourses,the results of which are seen in frequent and felicitous references in his Memoirs
Invites the mind is so very much to read again of a gentleman,might have carried him,if I Deuterostomia remember aright,he sniffs at theory and points to his clumsy assistant as proof of how well he learned,or too low down on the
membres.lycos.fr /vvsceociss/deuterostomia.html   (412 words)

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