ArticleScientific reports2017
Orthrozanclus elongata n. sp. and the significance of sclerite-covered taxa for early trochozoan evolution.
Article in Scientific reports, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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12 citing papers in PubMed.
- Evolutionary innovation within conserved gene regulatory networks underlying biomineralized skeletons in Bilateria.Molecular biology and evolution · 2026Article
- Changes in metazoan functional diversity across the Cambrian Radiation and the first Phanerozoic mass extinction: the Cambrian Sinsk Event.Proceedings. Biological sciences · 2025Article
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- The Cambrian cirratuliformProceedings. Biological sciences · 2023Article
- Exceptionally preserved early Cambrian bilaterian developmental stages from Mongolia.Nature communications · 2021Article
- New insight into the soft anatomy and shell microstructures of early Cambrian orthothecids (Hyolitha).Proceedings. Biological sciences · 2020Article
- Finding a home for hyoliths.National science review · 2020Article
- Are hyoliths Palaeozoic lophophorates?National science review · 2020Article
- Article
- Revisiting metazoan phylogeny with genomic sampling of all phyla.Proceedings. Biological sciences · 2019Article
- Sclerite-bearing annelids from the lower Cambrian of South China.Scientific reports · 2019Article
- Hyoliths with pedicles illuminate the origin of the brachiopod body plan.Proceedings. Biological sciences · 2018Article
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6 authors.
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Abstract
Orthrozanclus is a shell-bearing, sclerite covered Cambrian organism of uncertain taxonomic affinity, seemingly representing an intermediate between its fellow problematica Wiwaxia and Halkieria. Attempts to group these slug-like taxa into a single 'halwaxiid' clade nevertheless present structural and evolutionary difficulties. Here we report a new species of Orthrozanclus from the early Cambrian Chengjiang Lagerstätte. The scleritome arrangement and constitution in this material corroborates the link between Orthrozanclus and Halkieria, but not with Wiwaxia - and calls into question its purported relationship with molluscs. Instead, the tripartite construction of the halkieriid scleritome finds a more compelling parallel in the camenellan tommotiids, relatives of the brachiopods and phoronids. Such a phylogenetic position would indicate the presence of a scleritome in the common ancestor of the three major trochozoan lineages, Mollusca, Annelida and Brachiozoa. On this view, the absence of fossil Ediacaran sclerites is evidence against any 'Precambrian prelude' to the explosive diversification of these phyla in the Cambrian, c. 540-530 million years ago.
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