Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution.
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镀板的寒武纪双遗迹揭示了棘皮动物进化的最早阶段。
DOI:
10.1371/journal.pone.0038296
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Smith AB
中科院分区:
文献类型:
--
作者:
Zamora S;Rahman IA;Smith AB
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.
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