Abstract
The genus Cloudina Germs, 1972 includes seven species restricted to Ediacaran strata: 1. Cloudina lucianoi (Beurlen and Sommer, 1957) (Tamengo Formation, Brazil); 2. Cloudina hartmanae Germs, 1972 (Nama Group, Namibia); 3. Cloudina riemkeae Germs, 1972 (Nama Group, Namibia; 4. Cloudina waldei Hahn and Pflug, 1985 (Tamengo Formation, Brazil); 5. Cloudina lijiagouensis Zhang et al., 1992 (Yangtze Platform, China), 6. Cloudina sinensis Zhang et al., 1992, (Yangtze Platform, China); and 7. Cloudina carinata Cortijo et al., 2010 (Spain). Cloudina lucianoi was originally attributed to Aulophycus Fenton and Fenton, 1939 and was later suggested to represent a species of Cloudina. Briefly, Cloudina differs from Aulophycus in having a lamellar sessile benthic funnel-within-funnel skeleton instead of a tube-shaped skeleton. Additionally, Aulophycus has been considered restricted to the Cambrian, whereas all Cloudina species have been recorded only in the Ediacaran, with extinction of all species at the end of this period being observed. The results of taxonomic studies of Cloudina lucianoi are presented, as well asa revision of type-section, morphometric analysis, stratigraphic distribution and biostratigraphy. For this focal species, a new description, new diagnosis and morphometric analyses are included. Regarding taxonomy, a brief history is given of the Genus Cloudina, with remarks comparing Cloudina lucianoi with four other species. Additionally, new illustrations of type-material of Cloudina lucianoi, Cloudina hartmanae and Cloudina riemkeae are presented. The aforementioned species are revised in this report; additionally, an up-to-date stratigraphic approach and illustrations of the type-horizon of this species are included. A detailed comparison of the seven species is conducted to present a clearer diagnosis for this species described with material recovered from Brazil.
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