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A three-dimensionally preserved lobopodian from the Herefordshire (Silurian) Lagerstätte, UK

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posted on 15.08.2018, 15:43 by Derek J. Siveter, Derek E. G. Briggs, David J. Siveter, Mark D. Sutton, David Legg
The Herefordshire (Silurian) Lagerstätte (approx. 430 Myr BP) has yielded, among many exceptionally preserved invertebrates, a wide range of new genera belonging to crown-group Panarthropoda. Here, we increase this panarthropod diversity with the lobopodian Thanahita distos, a new total-group panarthropod genus and species. This new lobopodian preserves at least nine paired, long, slender appendages, the anterior two in the head region and the posterior seven representing trunk lobopods. The body ends in a short post-appendicular extension. Some of the trunk lobopods bear two claws, others a single claw. The body is covered by paired, tuft-like papillae. Thanahita distos joins only seven other known three-dimensionally preserved lobopodian or onychophoran (velvet worm) fossil specimens and is the first lobopodian to be formally described from the Silurian. Phylogenetic analysis recovered it, together with all described Hallucigenia species, in a sister-clade to crown-group panarthropods. Its placement in a redefined Hallucigeniidae, an iconic Cambrian clade, indicates the survival of this clade to Silurian times.

Funding

The Natural Environmental Research Council (grant no. NE/F0108037/1), the Leverhulme Trust (grant no. EM-2014-068), Oxford University Museum of Natural History, The Yale Peabody Museum of Natural History Invertebrate Paleontology Division and English Nature.

History

Citation

Royal Society Open Science, 2018, 5:172101

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Dept of Geology Pre Nov 17

Version

VoR (Version of Record)

Published in

Royal Society Open Science

Publisher

Royal Society, The

eissn

2054-5703

Acceptance date

06/07/2018

Copyright date

2018

Available date

15/08/2018

Publisher version

http://rsos.royalsocietypublishing.org/content/5/8/172101

Notes

Electronic supplementary material is available online at https://dx.doi.org/10.6084/m9.figshare.c.4173191.

Language

en