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Taxonomic revision of Ediacaran tubular fossils: Cloudina, Sinotubulites and Conotubus
<p>The Ediacaran tubular fossils, <i>Cloudina</i>, <i>Sinotubulites</i>, and <i>Conotubus</i>, are taxonomically revised with type materials. It is proposed that <i>Aulophycus lucianoi</i> Beurlen and Sommer, 1957 is not a senior synonym of <i>Cloudina hartmannae</i> Germs, 1972. Instead, most of its syntypes may be assigned to <i>Sinotubulites</i> or other taxa. Lectotypes of <i>Sinotubulites baimatuoensis</i> Chen et al., 1981 and <i>Conotubus hemiannulatus</i> Zhang and Lin, 1986 are designated from rediscovered syntypes. <i>Sinotubulites baimatuoensis</i> Chen et al., 1981 is reported from the Mooifontein Member of Nama Group at Aar Farm, Namibia. <i>Cloudina waldei</i> Hahn and Pflug, 1985 is assigned to <i>Sinotubulites baimatuoensis</i> and thus its occurrence range is extended to Brazil. The lectotype of <i>Conotubus hemiannulatus</i> shows corrugations and annulations on the surface distinguishing it from Cloudina and other collared Ediacaran tubular fossils. Based on the taxonomic revision, we propose a <i>Cloudina hartmannae</i> Interval Zone for the terminal Ediacaran with the upper boundary defined by the first appearance datum of <i>Protohertzina anabarica</i>, i.e. the index fossil of the early Cambrian <i>Anabarites trisulcatus</i>–<i>Protohertzina anabarica</i> Assemblage Zone.</p>
Taxonomic revision of Ediacaran tubular fossils: Cloudina, Sinotubulites and Conotubus
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