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- However, the reasons why echinoderms evolved their unique pentaradial body plan remain unclear. ▪ The Cambrian fossil record provides valuable insights into the origin and early evolution of echinoderms over half a billion years ago. ▪ Cambrian echinoderms were morphologically diverse, with several extinct groups exhibiting character combinations that distinguish them from living species. ▪ Phylogenetic analyses of bilateral, asymmetrical, triradial, and pentaradial fossils have allowed us to decipher the assembly of the modern echinoderm body plan. ▪ Echinoderms became ecologically diverse early in their history, with varied modes of feeding, locomotion, and attachment.了解详细信息:However, the reasons why echinoderms evolved their unique pentaradial body plan remain unclear. ▪ The Cambrian fossil record provides valuable insights into the origin and early evolution of echinoderms over half a billion years ago. ▪ Cambrian echinoderms were morphologically diverse, with several extinct groups exhibiting character combinations that distinguish them from living species. ▪ Phylogenetic analyses of bilateral, asymmetrical, triradial, and pentaradial fossils have allowed us to decipher the assembly of the modern echinoderm body plan. ▪ Echinoderms became ecologically diverse early in their history, with varied modes of feeding, locomotion, and attachment.www.annualreviews.org/content/journals/10.1146/a…During the Late Cambrian to Early Ordovician, two echinoderm classes went extinct and at least eight others evolved. This class-level turnover event resulted in dramatic changes in the total amount of morphospace occupied as several new asterozoan, crinoid and echinozoan body plans evolved.www.nature.com/articles/s41559-022-01664-8Evolution of echinoderm larvae has taken place over widely varying time scales from the origins of larvae of living classes in the early Palaeozoic, approximately 500 million years ago, to recent, rapid and large-scale changes that have occurred within living genera within a span of less than a million years to a few million years.www.nature.com/articles/6800866Echinoderms were ecologically, taxonomically, and morphologically diverse during the Cambrian and Ordovician periods, about 541–444 million years ago (Figure 1). During the early Paleozoic, they encompassed more than 30 distinctive clades.www.sciencedirect.com/science/article/pii/S096098…
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2020年7月6日 · A study of the early fossil record of echinoderms reveals dynamic patterns of body plan evolution and challenges current theories about their origin and maintenance. The article reviews the methods, …
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2012年6月6日 · 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 …
Echinoderm - Wikipedia
Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial symmetry, their larvae are ciliated, free-swimming organisms with bilateral symmetry. Later, during metamorphosis, …
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