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 …

2025年2月7日 · While the fossil record of echinoderms is extensive, there are many gaps, and many questions remain concerning the early evolution of the group. Ancient echinoderms exhibited an extraordinary variety of bizarre body forms; the earliest classes seemed to be “experimenting” with body shapes and feeding mechanisms; most were relatively short ...

2017年7月15日 · Comparative Echinoderm research highlights novel insights into GRN evolution. New approaches enabled through improved and additional genome assemblies. Evolution in GRNs driven by cis and trans changes. Species-level comparisons provide new regulatory evolution insight.

2020年5月4日 · To examine the evolutionary patterns and processes surrounding the origination and subsequent diversification of a major phylum, the Echinodermata (e.g., sea stars and sea urchins), we compiled an extensive database of early Paleozoic echinoderm morphology to test hypotheses regarding the patterns of morphological diversification and evolutionar...

2006年7月19日 · We review the evolution of the diverse larval forms of living echinoderms to outline the origins of echinoderm larval forms, their diversity among living echinoderms, molecular clocks and...

2015年3月5日 · Echinoderms are a major group of invertebrate deuterostomes that have been an important component of marine ecosystems throughout the Phanerozoic. Their fossil record extends back to the Cambrian, when several disparate groups appear in different palaeocontinents at about the same time.

A bilaterally symmetrical ancestor of Echinodermata lay on its dorsal side, so its anus was shifted to the ventral side as in present-day echinoderm larvae. This stage of evolution corresponds to the Early Paleozoic bilaterally symmetrical forms, such as …

Echinoderms are a major group (phylum) of invertebrate animals with a rich fossil record stretching back to the Cambrian period, approximately 518 million years ago. While all modern species are characterized by pentaradial (i.e., fivefold) symmetry, Cambrian echinoderms also include taxa with different types of symmetry (e.g., bilateral symmetry).

2002年1月22日 · In addition, the comparative embryologists employed a diverse array of echinoderms, not a few model species, and this diversity has led to a broad understanding of the development, function, and evolution of echinoderm larvae. As a result, this branch of life history evolution has deep roots in comparative developmental biology of echinoderms.

1977年1月1日 · In this section I shall review the fossil evidence for vital functions in echinoderms to see if there is any relationship between survival and efficiency, considering first the general pattern of echinoderm evolution, then I shall make a more detailed analysis of primitive echinoderms, and finally discuss any well-documented trends.