Markuelia is a genus of fossil worm-like bilaterian animals allied to Ecdysozoa and known from strata of Lower Cambrian to Lower Ordovician age containing five species. An advanced X-ray imaging technique called X-ray tomographic microscopy has been applied to splendidly preserved, uncrushed Markuelia fossils found in Hunan province in southern China and in eastern Siberia. When details in features smaller than one micrometre across can be observed, these fossils are seen to represent many developmental stages, from the first cell divisions to the time of hatching; therefore they offer a unique opportunity to study the development of Lower Cambrian animals.
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| - Markuelia (de)
- Markuelia (en)
- Markuelia (nl)
- Markuelia (pt)
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| - Markuelia ist eine aus der erdgeschichtlichen Periode des im mittleren Kambrium erhaltene Gattung fossiler Würmer. Es gibt zwei bekannte Arten, die vermutlich die engsten bekannten Verwandten der drei modernen Tierstämme der Korsetttierchen (Loricifera), Hakenrüssler (Kinorhyncha) und Priapswürmer (Priapulida) darstellen. In der Hunan-Provinz Südchinas wurden Embryos von Markuelia hunanensis, in Ostsibirien solche von Markuelia secunda gefunden. Erstere haben sich aus nahezu allen Entwicklungsstadien von den ersten Zellteilungen bis zum Zeitpunkt des Schlüpfens erhalten und geben einen einmaligen Einblick nicht nur in die Embryonalentwicklung dieser Tiere, sondern auch in die Stammesgeschichte der gesamten, als Scalidophora bekannten, Gruppe. (de)
- Markuelia is een fossiel geslacht van wormachtige dieren, die leefden in het Vroeg Cambrium. (nl)
- Markuelia is a genus of fossil worm-like bilaterian animals allied to Ecdysozoa and known from strata of Lower Cambrian to Lower Ordovician age containing five species. An advanced X-ray imaging technique called X-ray tomographic microscopy has been applied to splendidly preserved, uncrushed Markuelia fossils found in Hunan province in southern China and in eastern Siberia. When details in features smaller than one micrometre across can be observed, these fossils are seen to represent many developmental stages, from the first cell divisions to the time of hatching; therefore they offer a unique opportunity to study the development of Lower Cambrian animals. (en)
- Markuelia denota um género fóssil, contituido por vermes, e cuja relação com modernos filos é disputada. Existiram no Câmbrico Médio que abrage duas espécies conhecidas, Markuelia hunanensis e Markuelia secunda, presumivelmente os parentes mais próximos dos três taxa modernos de animais bilatérios: Loricifera, Kinorhyncha e Priapulida. (pt)
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| - Markuelia ist eine aus der erdgeschichtlichen Periode des im mittleren Kambrium erhaltene Gattung fossiler Würmer. Es gibt zwei bekannte Arten, die vermutlich die engsten bekannten Verwandten der drei modernen Tierstämme der Korsetttierchen (Loricifera), Hakenrüssler (Kinorhyncha) und Priapswürmer (Priapulida) darstellen. In der Hunan-Provinz Südchinas wurden Embryos von Markuelia hunanensis, in Ostsibirien solche von Markuelia secunda gefunden. Erstere haben sich aus nahezu allen Entwicklungsstadien von den ersten Zellteilungen bis zum Zeitpunkt des Schlüpfens erhalten und geben einen einmaligen Einblick nicht nur in die Embryonalentwicklung dieser Tiere, sondern auch in die Stammesgeschichte der gesamten, als Scalidophora bekannten, Gruppe. (de)
- Markuelia is a genus of fossil worm-like bilaterian animals allied to Ecdysozoa and known from strata of Lower Cambrian to Lower Ordovician age containing five species. An advanced X-ray imaging technique called X-ray tomographic microscopy has been applied to splendidly preserved, uncrushed Markuelia fossils found in Hunan province in southern China and in eastern Siberia. When details in features smaller than one micrometre across can be observed, these fossils are seen to represent many developmental stages, from the first cell divisions to the time of hatching; therefore they offer a unique opportunity to study the development of Lower Cambrian animals. The features observed indicate that the genus had a mouth surrounded by a ring of teeth, an alimentary canal, and an anus. However the characters preserved are inconclusive regarding the genus' taxonomic affinity; it can at best be placed in the scalidophoran total group, since it is currently impossible to ally it with the Priapulids or other scalidophora. (en)
- Markuelia is een fossiel geslacht van wormachtige dieren, die leefden in het Vroeg Cambrium. (nl)
- Markuelia denota um género fóssil, contituido por vermes, e cuja relação com modernos filos é disputada. Existiram no Câmbrico Médio que abrage duas espécies conhecidas, Markuelia hunanensis e Markuelia secunda, presumivelmente os parentes mais próximos dos três taxa modernos de animais bilatérios: Loricifera, Kinorhyncha e Priapulida. Podem ser encontrados na província de Hunan (sul da China) e na Sibéria oriental. Estes fósseis apresentam diversos estágios de desenvolvimento embrionário, providenciando assim um mieo de estudo deste tipo de desenvolvimento em animais do Câmbrio. Providenciam também um caminho para se descortinar a filogenia de todo o taxon que é hoje conhecido como Scalidophora. (pt)
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