• Chambers's Twentieth Century Dictionary
    • n Gastraea gas-trē′a (biol.) a hypothetic animal form assumed by Hæckel as the ancestor of all metazoic animals
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In literature:

The gastraea swam by cilia, little eyelash-like processes which urge the animal forward like a myriad of microscopic oars.
"The Whence and the Whither of Man" by John Mason Tyler
The gastrula stage was the palingenetic repetition of the ancestral form of all Metazoa, the Gastraea.
"Form and Function" by E. S. (Edward Stuart) Russell
His well-known "gastraea" theory is an outcome of this generalization.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7" by Various
The phyletic development of the six higher animal tribes, which are all derived from the Gastraea, deviated at this point in two directions.
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel
To this form Haeckel gave the name of gastraea or gastrula.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour