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gastraeaGastraea (ger.)

  • A primitive sac-like animal, whose existence is assumed by Haeckel, consisting of two layers of cells, an ectoderm and an endoderm. Gastræa theory, the theory which supposes this to have been the ancestral form of the whole animal kingdom. (OED)
    development
    1872
    Aus dieser Identität der Gastrula [...] schließe ich nach dem biogenetischen Grundgesetz auf eine gemeinsame Descendenz der animalen Phylen von einer einzigen unbekannten Stammform, welche im Wesentlichen der Gastrula gleichgebildet war: Gastraea

    Haeckel, E. (1872). Biologie der Kalkschwämme (Calcispongien und Grantien): 467.

    1982

    gastraea The hypothetical adult ancestor of all higher animals, inferred from the existence of the gastrula (formed by invagination of a blastula) as a stage common to the early ontogeny of higher animals; cf. blastaea.

    Lincoln, R.J., Boxshall, G.A. & Clark, P.F. (1982). A Dictionary of Ecology, Evolution and Systematics: 99.

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