Critical appraisal of tubular putative eumetazoans from the Ediacaran Weng'an Doushantuo biota.

ABSTRACT: Molecular clock analyses estimate that crown-group animals began diversifying hundreds of millions of years before the start of the Cambrian period. However, the fossil record has not yielded unequivocal evidence for animals during this interval. Some of the most promising candidates for Precambrian animals occur in the Weng'an biota of South China, including a suite of tubular fossils assigned to Sinocyclocyclicus, Ramitubus, Crassitubus and Quadratitubus, that have been interpreted as soft-bodied eumetazoans comparable to tabulate corals. Here, we present new insights into the anatomy, original composition and phylogenetic affinities of these taxa based on data from synchrotron radiation X-ray tomographic microscopy, ptychographic nanotomography, scanning electron microscopy and electron

SUBMITTER: Cunningham JA 

PROVIDER: S-EPMC4528530 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature