Protostomes are a nephrozoan taxon of animals above the level of phylum.
It is not part of the normal system of classification.
Protostomes | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Subkingdom: | Eumetazoa |
Clade: | ParaHoxozoa |
Clade: | Bilateria |
Clade: | Nephrozoa |
(unranked): | Protostomia Grobben, 1908 |
Superphyla | |
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They are a subtaxon of the Bilateria, and are contrasted with the deuterostomes. Protosomes are distingued by their embryo: in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth.
DNA sequence analysis suggests that protostome animals can be divided into three major groups:
as well as a number of minor taxa, like the Chaetognatha.
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