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Pelmatozoa

From Wikipedia, the free encyclopedia

Pelmatozoa was once a clade of Phylum Echinodermata. It included stalked and sedentary echinoderms. The main class of Pelmatozoa were the Crinoidea which includes sea lily and feather star.

Pelmetazoa is no longer a classification of Echinodermata.[1]

Pelmetazoa
Temporal range: 535–0 Ma Middle CambrianRecent
Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Clade: Ambulacraria
Phylum: Echinodermata
Groups included
Crinoidea
Blastozoa

Pelmatozoa s.l. (sensu lato) or Crinozoa s.l., were in some systems a large taxon, sometimes considered a subphylum of echinoderms.

The majority of Pelmatozoa s.l. consisted of the extinct taxon Blastozoa.

Pelmatozoa s.s. (sensu stricto) sometimes only include Crinoidea.

Characteristics

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The body of these ancient Echinodermates is anchored to the bottom through a stem analogous to the epistome of Phoronidea. They're sessile, only rarely capable of movement. Fossils date back at least to Cambrium so they've been on Earth for over 500 million years.

In the past, they were a numerous group of marine fauna and many groups belong to lead fossils, however today only one smaller class remains extant.

System (Phylogeny)

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Pelmatozoa s.l. = Crinozoa s.l.:


  • subphylum Crinozoa or s.s. Pelmatozoa s.s. today consists of only one class, but traditionally consisted of also another taxon - Paracrinoidea

Formerly even Carpoidea/Homalozoa belonged to Pelmatozoa.

Sources for this chapter: [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]

References

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