A primitive sac-like animal, whose existence is assumed by Haeckel, consisting of two layers of cells, an ectoderm and an endoderm. gastraea theory…
| 单词 | θ32260 |
| 释义 | the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > [noun] > gastraea (1) gastraea1879 A primitive sac-like animal, whose existence is assumed by Haeckel, consisting of two layers of cells, an ectoderm and an endoderm. gastraea theory… |
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