Asterotheca in Tacuary Formation (Upper Permian) of Eastern Paraguay
DOI:
https://doi.org/10.4013/4531Abstract
The genus Asterotheca, represented by Asterotheca cf. pitnitzkyi (Frenguelli) emend Vieira et al. 2007 is described for the first time from the Upper Permian Tacuary Formation of Paraguay. Those forms are widely distributed in the levels of similar age of the Paraná Basin as such but also under names like Pecopteris pedrasica Read and P. cambuhyensis Read and perhaps also P. taguaiensis Rohn & Rösler, and P. dolianitii Rohn & Rosler and P. cadeadensis Rohn & Rosler. The polymorphism of those taxa is also briefly discussed. It is possible also that, given the big size of the frond, the species could be related with Tuvichapteris Herbst, a big marattialean fern known from its stem anatomy in Paraguay. It seems noteworthy that this fern is not accompanied by any other fossil plant at the source levels.
Key words: Asterotheca, Marattiales, Upper Permian, Tacuary Formation, Paraguay.Downloads
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