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Triploblasts (from lat.-gr.tri ~ three and blastos ~ Germ, bud) in the broader sense are tissue animals in which three cotyledons develop from the blastula in the course of gastrulation. The tricot, so triploblasticEmbryo is called triploblast in the narrower sense. The three cotyledons are ectoderm, mesoderm, and endoderm.
Triploblasty (Tricotyledon) is found in all originally bilaterally symmetrical animals and is evidently directly linked to the development of bilateralism. Dicotyledonousness (diploblasty), however, is found in the coelenterates, monocotyledonous in the tissue-less Metazoa and the Placozoon Trichoplax adhaerens.
The first evidence of a triploblast in the broader sense is Kimberella from the Ediacarium, a presumed ancestor of todays mollusks.
Werner A. Müller, Monika Hassel: Developmental biology. 2005 4, ISBN |||PHONE_NUMBER||| , pp. 254ff.
H. Philippe, A. Chenuil, A. Adoutte: Can the Cambrian explosion be inferred through molecular phylogeny? Development (Supplement), 1994, p. IS25 ff.
Kevin J. Peterson, Mark A. McPeek, David A. D. Evans: Tempo and mode of early animal evolution: inferences from rocks, Hox, and molecular clocks. In: Paleobiology. 31 (2, Supplement), 2005, pp. 36-55.
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