triploblast

(noun)

a blastula in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm; formed during gastrulation of the blastula

Related Terms

Examples of triploblast in the following topics:

  • Animal Characterization Based on Features of Embryological Development

    • Bilaterally-symmetrical animals are called triploblasts, developing three tissue layers: an inner layer (endoderm), an outer layer (ectoderm), and a middle layer (mesoderm).
    • Triploblasts can be differentiated into three categories: those that do not develop an internal body cavity called a coelom (acoelomates), those with a true coelom (eucoelomates), and those with "false" coeloms (pseudocoelomates) .
    • Triploblasts that do not develop a coelom are called acoelomates: their mesoderm region is completely filled with tissue.
    • Triploblasts develop a third layer, the mesoderm, between the endoderm and ectoderm
    • Triploblasts may be (a) acoelomates, (b) eucoelomates, or (c) pseudocoelomates.

  • Superphylum Lophotrochozoa

    • The lophotrochozoans are triploblastic, possessing an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians.

  • Phylum Nematoda

    • The Nematoda, similar to most other animal phyla, are triploblastic, possessing an embryonic mesoderm that is sandwiched between the ectoderm and endoderm.