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Protostomia
Fossil range: Ediacaran - Recent
Scientific classification

Domain:

Eukaryota

(Unranked) :

Opisthokonta

Kingdom:

Animalia

Subkingdom:

Eumetazoa

(Unranked) :

Bilateria

(Unranked) :

Protostomia
Grobben, 1908

Subdivisions:

  • Ecdysozoa
  • Lophotrochozoa
  • Platyzoa

Protostomia (from the Greek: mouth first) are a clade of animals. Together with the deuterostomes and a few smaller phyla, they make up the Bilateria, mostly comprising animals with bilateral symmetry and three germ layers. The major distinctions between deuterostomes and protostomes are found in embryonic development.

Mantell's Iguanodon restoration
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