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Die Gastraea-Theorie, die phylogenetische Classification des Thierreichs und die Homologie der Keimblätter.

Jena. Z. Naturw., 8, 1-55., Jena, 1874.

Haeckel’s gastraea theory, which considers the two-layered gastrula as the ancestral form of multicellular animals.



Subjects: Biology, Evolution
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