#blastopore  the opening into the archenteron
  supertype:  #orifice__opening__porta  an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
  part of:  #archenteron  central cavity of the gastrula; becomes the intestinal or digestive cavity
     part of:  #gastrula  double-walled stage of the embryo succeeding the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm

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