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| Volume / Issue | 18(1) |
| Pages | 33-45 |
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| Article Link | http://dx.doi.org/10.1080/08912960500508689 |
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| DOI | 10.1080/08912960500508689 |
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| Tags | Vendobionts; Ediacaran; Primicaris; Skania; Kaili Formation; Burgess Shale-type deposits |
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| Abstract | Constraining the origin of animal groups is allowed, to some extent, by discoveries of Cambrian Lagerst_tten that preserve both mineralizing and nonmineralizing organisms. A new species is reported here of the Cambrian arthropod Skania, which bears an exoskeleton that shares homologies with the Neoproterozoic (Ediacaran) organism Parvancorina and firmly establishes a Precambrian root for arthropods. A new monophyletic group, Parvancorinomorpha, is proposed as the first clade within the arthropod crown group demonstrably ranging across the Neoproterozoic_Paleozoic transition. The Parvancorinomorpha is interpreted to be the sister group of the Arachnomorpha. Incipient cephalization in Skania and related genera represents a step in the progression toward division of a cephalon from a large posterior trunk as shown in Cambrian arachnomorphs such as naraoiids and the addition of a pygidium and thoracic tergites as shown in the arachnomorph clade basal to trilobites. This evidence can serve as a new calibration point for estimating the divergence time for the last common ancestor of arthropods and priapulids based on molecular clock methods. |
Created: 12/14/2017 10:29 AM (ET)
Modified: 12/14/2017 10:29 AM (ET)