Project 3215: T. Shao, Y. Liu, B. Duan, H. Zhang, H. Zhang, Q. Wang, Y. Zhang, J. Qin. 2018. The Fortunian (lowermost Cambrian) Qinscyphus necopinus (Cnidaria, Scyphozoa, Coronatae) underwent direct development. Jahrbuch fuer Geologie und Palaeontologie. 289 (2):149-159.
Specimen: † Qinscyphus necopinus (UMCU/17CHD0919-001:UMCU 17CHD0919-001)
View: reconstruction

Abstract

The Cambrian fossil embryos are represented by taxa of Olivooides, Pseudooides, Quadrapyrgites and Markuelia. It has previously been proposed that all these fossil embryos underwent direct development, and thus animals with direct development are deeply rooted in the Cambrian Period. Here, we report new three dimensionally phosphatized microfossils of coronate scyphozoan Qinscyphus necopinus from the Cambrian Fortunian Kuanchuanpu Formation at Zhangjiagou Lagerst├Ątte, southern Shaanxi Province, South China. The new material includes fragmentary specimens of hatched stages with oral part preserved, and thus permits a revision of the morphology of Q. necopinus. And more important is a new type of fossil embryo that has morphology comparable with that of the hatched stages of Q. necopinus. This new embryo is thus assigned to the prehatching embryonic stage of Q. necopinus, and it demonstrates that Q. necopinus underwent direct development. Direct development is a ubiquitous development mode of the Cambrian fossil embryos, and it is proposed here that direct development may be the plesiomorphy of metazoan development.


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Article DOI: 10.1127/njgpa/2018/0755

Project DOI: 10.7934/P3215, http://dx.doi.org/10.7934/P3215
This project contains
  • 6 Media
  • 8 Documents
  • 1 Taxon
  • 2 Specimens
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MorphoBank Project 3215
  • Creation Date:
    29 June 2018
  • Publication Date:
    29 June 2018
  • Project views: 968


    Members

    member name taxa specimens media media
    notes
    Huaqiao Zhang
    Project Administrator
    Last logged in 06/29/18
    1232
    Kenzley Alphonse
    Last logged in 01/23/19
    0000
    Tanya Berardini
    Last logged in 01/23/19
    0033
    MorphoBank Curator
    Last logged in 01/23/19
    0000


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