Прохожий (prokhozhyj) wrote,
Прохожий
prokhozhyj

Гребневики со скелетными элементами?

 
      Недавно группа китайских учёных описала из кембрийских отложений Китая несколько ископаемых гребневиков, которые вроде как пытались обзавестись скелетными элементами...

      "Unlike cnidarians, where skeletonization (biomineralization and sclerotization) evolved repeatedly among ecologically important taxa (for example, scleractinians and octocorals), living ctenophores are characteristically soft-bodied animals. We report six sclerotized and armored ctenophores from the early Cambrian period. They have diagnostic ctenophore features (for example, an octamerous symmetry, oral-aboral axis, aboral sense organ, and octaradially arranged ctene rows). Unlike most modern counterparts, however, they lack tentacles, have a sclerotized framework, and have eight pairs of ctene rows. They are resolved as a monophyletic group (Scleroctenophora new class) within the ctenophores..." (Qiang Ou et al., 2015).



Реконструкции вновь описанных Gemmactena actinala и Batofasciculus ramificans (op. cit., fig. 3, фрагмент).

      Сижу и перевариваю новость, пытаясь встроить её в картину мира :).


References

Qiang Ou, Shuhai Xiao, Jian Han, Ge Sun, Fang Zhang, Zhifei Zhang, Degan Shu. A vanished history of skeletonization in Cambrian comb jellies // Science Advances. 10 Jul 2015: Vol. 1, no. 6, e1500092. DOI: 10.1126/sciadv.1500092 (open access).


 
Tags: science, звери
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