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Diploblasts

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General Biology I

Definition

Diploblasts are animals that develop from two primary germ layers: the ectoderm and the endoderm. They lack a mesoderm, which is present in more complex organisms called triploblasts.

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5 Must Know Facts For Your Next Test

  1. Diploblasts include phyla such as Cnidaria (jellyfish, corals) and Ctenophora (comb jellies).
  2. They have radial symmetry, meaning their body plan is arranged around a central axis.
  3. The ectoderm forms the outer layer of cells, while the endoderm forms the inner lining of the gut.
  4. Diploblastic animals do not possess true muscles derived from mesoderm; instead, they have simple muscle-like cells.
  5. They typically exhibit simple tissue organization and lack complex organs found in triploblastic organisms.

Review Questions

  • What are the two primary germ layers present in diploblasts?
  • Name two phyla that include diploblastic animals.
  • How does the body symmetry of diploblastic animals differ from that of triploblastic animals?

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