Zhang, X.-G. and Smith, M.R. and Yang, J. and Hou, J.-B. (2016) 'Onychophoran-like musculature in a phosphatized Cambrian lobopodian.', Biology letters., 12 (9). p. 20160492.
The restricted, exclusively terrestrial distribution of modern Onychophora contrasts strikingly with the rich diversity of onychophoran-like fossils preserved in marine Cambrian Lagerstätten. The transition from these early forebears to the modern onychophoran body plan is poorly constrained, in part owing to the absence of fossils preserving details of the soft anatomy. Here, we report muscle tissue in a new early Cambrian (Stage 3) lobopodian, Tritonychus phanerosarkus gen. et sp. nov., preserved in the Orsten fashion by three-dimensional replication in phosphate. This first report of Palaeozoic onychophoran musculature establishes peripheral musculature as a characteristic of the ancestral panarthropod, but documents an unexpected muscular configuration. Phylogenetic analysis reconstructs T. phanerosarkus as one of a few members of the main onychophoran lineage—which was as rare and as cryptic in the Cambrian period as it is today.
|Full text:||(AM) Accepted Manuscript|
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|Publisher Web site:||http://rsbl.royalsocietypublishing.org/|
|Date accepted:||24 August 2016|
|Date deposited:||14 September 2016|
|Date of first online publication:||27 September 2016|
|Date first made open access:||14 September 2016|
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