Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.

Echinoderms are unique in being pentaradiate, having diverged from the ancestral bilaterian body plan more radically than any other animal phylum. This transformation arises during ontogeny, as echinoderm larvae are initially bilateral, then pass through an asymmetric phase, before giving rise to th...

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Autores principales:	Samuel Zamora, Imran A Rahman, Andrew B Smith
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72ee32504f924ee79de9f7a9b00c9de0
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spelling	oai:doaj.org-article:72ee32504f924ee79de9f7a9b00c9de02021-11-18T07:16:12ZPlated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.1932-620310.1371/journal.pone.0038296https://doaj.org/article/72ee32504f924ee79de9f7a9b00c9de02012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22701623/?tool=EBIhttps://doaj.org/toc/1932-6203Echinoderms are unique in being pentaradiate, having diverged from the ancestral bilaterian body plan more radically than any other animal phylum. This transformation arises during ontogeny, as echinoderm larvae are initially bilateral, then pass through an asymmetric phase, before giving rise to the pentaradiate adult. Many fossil echinoderms are radial and a few are asymmetric, but until now none have been described that show the original bilaterian stage in echinoderm evolution. Here we report new fossils from the early middle Cambrian of southern Europe that are the first echinoderms with a fully bilaterian body plan as adults. Morphologically they are intermediate between two of the most basal classes, the Ctenocystoidea and Cincta. This provides a root for all echinoderms and confirms that the earliest members were deposit feeders not suspension feeders.Samuel ZamoraImran A RahmanAndrew B SmithPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 6, p e38296 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samuel Zamora Imran A Rahman Andrew B Smith Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
description	Echinoderms are unique in being pentaradiate, having diverged from the ancestral bilaterian body plan more radically than any other animal phylum. This transformation arises during ontogeny, as echinoderm larvae are initially bilateral, then pass through an asymmetric phase, before giving rise to the pentaradiate adult. Many fossil echinoderms are radial and a few are asymmetric, but until now none have been described that show the original bilaterian stage in echinoderm evolution. Here we report new fossils from the early middle Cambrian of southern Europe that are the first echinoderms with a fully bilaterian body plan as adults. Morphologically they are intermediate between two of the most basal classes, the Ctenocystoidea and Cincta. This provides a root for all echinoderms and confirms that the earliest members were deposit feeders not suspension feeders.
format	article
author	Samuel Zamora Imran A Rahman Andrew B Smith
author_facet	Samuel Zamora Imran A Rahman Andrew B Smith
author_sort	Samuel Zamora
title	Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
title_short	Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
title_full	Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
title_fullStr	Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
title_full_unstemmed	Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
title_sort	plated cambrian bilaterians reveal the earliest stages of echinoderm evolution.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/72ee32504f924ee79de9f7a9b00c9de0
work_keys_str_mv	AT samuelzamora platedcambrianbilateriansrevealtheearlieststagesofechinodermevolution AT imranarahman platedcambrianbilateriansrevealtheearlieststagesofechinodermevolution AT andrewbsmith platedcambrianbilateriansrevealtheearlieststagesofechinodermevolution
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Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.

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