What is Protostome?
{{Automatic taxobox | fossil_range={{Fossil range|570|0|Ediacaran - Recent}} | name=Protostomes | image = <imagemap> File:Protostomia.jpg|220px rect 0 0 660 660 [[Arthropod]] rect 0 660 660 1320 [[Mollusca]] rect 0 1320 660 1980 [[Annelid]] rect 660 0 1320 660 [[Nematode]] rect 660 660 1320 1320 [[Flatworm]] rect 660 1320 1320 1980 [[Rotifer]] </imagemap> | display_parents=4 | taxon=Protostomia | authority=[[Karl Grobben|Grobben]], 1908 | subdivision_ranks=Superphyla | subdivision= *[[Ecdysozoa]] *[[Spiralia]] }} '''Protostomes''' are a [[nephrozoa]]n [[taxon]] of [[animal]]s above the level of [[phylum]]. It is not part of the normal system of [[classification]]. They are a subtaxon of the [[Bilateria]], and are contrasted with the [[deuterostome]]s. 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: *[[Ecdysozoa]], e.g. [[arthropod]]s, [[nematode]]s *[[Platyzoa]], e.g. [[platyhelminthes]], [[rotifer]]s *[[Lophotrochozoa]], e.g. [[mollusc]]s, [[annelid]]s as well as a number of minor taxa, like the [[Chaetognatha]]. [[Category:Invertebrates]] [[Category:Groups of phyla]]