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Embryological origins of the mouth and anus

Embryological origins of the mouth and anus

Important characteristic for separating animals into protostomes and deuterostomes.

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Readers' pathsAug 2026 – Oct 2026

Readers go next to

Share of the 876 clicks on its links

  1. Deuterostome

    Superphylum of bilateral animals.

    34%

  2. Protostome

    Clade of animals whose mouth develops before the anus.

    25%

  3. Bilateria

    Animals with embryonic bilateral symmetry.

    13%

  4. Gastrulation

    Embryologic stage in which germ layers form.

    9.7%

  5. Xenacoelomorpha

    Phylum of animals.

    9.2%

  6. Acoelomorpha

    Phylum of marine, flatworm-like animals.

    3.9%

  7. Embryology

    Branch of biology studying prenatal development.

    1.4%

Readers come from

Share of the 709 readers arriving from another article

  1. Protostome

    Clade of animals whose mouth develops before the anus.

    42%

  2. Bilateria

    Animals with embryonic bilateral symmetry.

    26%

  3. Gastrulation

    Embryologic stage in which germ layers form.

    8.3%

  4. Animal

    Biological kingdom.

    3.2%