Anatomy and affinities of a new 535-million-year-old medusozoan from the Kuanchuanpu Formation, South China - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Palaeontology Année : 2017

Anatomy and affinities of a new 535-million-year-old medusozoan from the Kuanchuanpu Formation, South China

Jian Han
  • Fonction : Auteur
Qiang Ou
  • Fonction : Auteur
Xiaoguang Yang
  • Fonction : Auteur
Kentaro Uesugi
  • Fonction : Auteur
Osamu Sasaki
  • Fonction : Auteur
Tsuyoshi Komiya
  • Fonction : Auteur

Résumé

We describe here Sinaster petalon gen. et sp. nov., a new embryonic form from the c. 535 million-year-old Kuanchuanpu Formation of South China (Ningqiang, Shaanxi Province). The excellent three-dimensional, phosphatic preservation of these microfossils allowed us to use x-ray microtomographic techniques to make accurate reconstructions of their internal structures and to compare their anatomy point-by-point with that of extant cnidarians and other animal groups. Sinaster petalon has anatomical features typical of extant Medusozoa (Cnidaria), such as coronal muscles, perradial and adradial frenula, interradial septa, accessory septa, gonad-lamellae, tentacle buds and perradial pockets. Although Sinaster cannot be straightforwardly assigned to any crown-group within Medusozoa, the presence of marginal lappets and endodermal lamellae suggests that it is closer to Cubozoa and Scyphozoa than to any other group of modern cnidarians. The tentative placement of Sinaster within the stem-group Cubozoa is justified by the presence of a velarium supported by a frenulum. The cubozoan affinities of Sinaster are also supported by cladistic analysis.

Dates et versions

hal-02358937 , version 1 (12-11-2019)

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Citer

Xing Wang, Jian Han, Jean Vannier, Qiang Ou, Xiaoguang Yang, et al.. Anatomy and affinities of a new 535-million-year-old medusozoan from the Kuanchuanpu Formation, South China. Palaeontology, 2017, 60 (6), pp.853--867. ⟨10.1111/pala.12320⟩. ⟨hal-02358937⟩
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