- Ambulacraria
Taxobox
name = Ambulacrarians
fossil_range = LateEdiacaran - Recent
image_width = 200px
image_caption = Variousstarfish andsea urchin s among mussel shells in the rocky intertidal zone ofKachemak Bay .
regnum =Animal ia
subregnum =Eumetazoa
unranked_phylum =Bilateria
superphylum = Ambulacraria
superphylum_authority =
subdivision_ranks = Phyla
subdivision =
* Xenoturbellida (2 species)
*Echinoderm ata (20,000 species)
*Hemichordata (71 species)The
Ambulacraria is aclade of invertebrates which includesechinoderm s,hemichordate s, andXenoturbellida . This superphylum is largely identical to the superphylumDeuterostomia , except the phylumChordata is not found in Ambulacraria.There three living phyla, with representative organisms, are:
* PhylumEchinodermata (starfish ,sea urchin s,brittle star s,sea cucumber s,feather star s, sea lilies, etc.)
* PhylumHemichordata (acorn worm s,Pterobranchia , and possiblygraptolite s)
* PhylumXenoturbellida (two species of worm-like animals)
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