Projects per year
Early Cambrian Pseudooides prima has been described from embryonic and post-embryonic stages of development, exhibiting long germ band development. There has been some debate about the pattern of segmentation, but this interpretation, as among the earliest records of ecdysozoans, has been generally accepted. Here we show that the ‘germ band’ of Pseudooides prima embryos separates along its mid axis during development, with the transverse furrows between the ‘somites’ unfolding into the polar aperture of the hexaradial theca of Hexaconularia sichuanensis, conventionally interpreted as a scyphozoan cnidarian; co-occurring post-embryonic remains of ecdysozoans are unrelated. We recognize Hexaconularia sichuanensis as a junior synonym of Pseudooides prima as a consequence of identifying these two form taxa as a distinct developmental stages of the same organism. Direct development in Pseudooides prima parallels the co-occuring olivooids Olivooides and Quadrapyrgites and Bayesian phylogenetic analysis of a novel phenotype dataset indicates that, despite differences in their tetra-, penta- and hexa-radial symmetry, these hexangulaconulariids comprise a clade of scyphozoan medusozoans, with Arthrochites and conulariids, that all exhibit direct-development from embryo to thecate polyp. The affinity of hexangulaconulariids to extant scyphozoan medusozoans indicates that the prevalence of tetraradial symmetry and indirect development is a vestige of a broader spectrum of bodyplan symmetries and developmental modes that was manifest in their early Phanerozoic counterparts.
|Number of pages||10|
|Journal||Proceedings of the Royal Society B: Biological Sciences|
|Early online date||13 Dec 2017|
|Publication status||Published - 20 Dec 2017|
- MSc Palaeobiology
FingerprintDive into the research topics of 'The early Cambrian fossil embryo Pseudooides is a direct developing cnidarian, not an early ecdysozoan'. Together they form a unique fingerprint.
- 3 Finished
Neoproterozoic - Phanerozoic transition
9/01/17 → 31/07/22
Decoding the Doushantuo
25/03/15 → 24/03/19
Major transitions in evolution: understanding the fossil evidence
1/09/12 → 1/03/17
The early Cambrian fossil embryo Pseudooides is a direct developing cnidarian, not an early ecdysozoan.
Duan, B. (Creator), Dong, X. (Creator), Porras, L. (Creator), Vargas, K. (Creator), Cunningham, J. A. (Creator) & Donoghue, P. C. J. (Creator), University of Bristol, 10 Oct 2017
DOI: 10.5523/bris.3vd8kczvuzo3y2nrn6n8m6l2y4, http://data.bris.ac.uk/data/dataset/3vd8kczvuzo3y2nrn6n8m6l2y4
- 1 Fellowship awarded competitively
Postdoctoral Fellow (FEC) - Major transitions in evolution: understanding the fossil evidence.
John A Cunningham (Recipient)1 Sep 2012 → 1 Mar 2017
Activity: Other activity types › Fellowship awarded competitively