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Triploblasty
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Triploblasty is a condition of the gastrula in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. Germ cells are set aside in the embryo at the blastula stage, and are in
Classification of tripoblasts based on body cavities
Classification of tripoblasts based on body cavities
Bilateria
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Bilateria is a large clade of animals characterised by bilateral symmetry during embryonic development. This means their body plans are laid around a longitudinal axis with a front and a rear end, as
Bilateria
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.