Royal Sea Star 31-I
DEUTEROSTOMIA
"Mouth Second" Organisms
 
 
Royal Sea Star (Astropecten articulatus)
[© Mark Walz]



Chapter Outline
  1. Description of Deuterostomia
  2. Classification of Deuterostomia
  3. Echinodermata
  4. Hemichordata

Tree



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Back in chapter 27, we started exploring the classification Bilateria, and noted that it was split into three groups: Xenacoelomorpha, Protostomia and Deuterostomia. The first group is a phylum that was explored in chapter 27 itself. For the past three chapters, Protostomia has been explored. Now we will explore the third group of Bilateria, Deuterostomia.

Deuterostomia is split into three phyla, two of which wil be explored in this chapter. The third phylum is Chordata, which will be explored in the following chapters. A fourth phylum, Chaetognatha, was formerly placed in Deuterostimia due to its embryonic development but has recently been reclassified into Protostomia based on genetic analysis.

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