A new species of Phyllotheca Brongniart (Townrow) in the Lower Permian of Parana Basin, RS
Abstract
This paper deals with remains of Sphenophyta found on the upper levels of Itararé Subgroup, Early Permian in age (late Sakmarian), from Morro do Papaléo outcrop, in Mariana Pimentel municipality, Rio Grande do Sul state. The new species described, P. brevifolia, is distinct from the other ones established in the Phylloteca genus, by its shorten leaf sheath strongly adpressed to the stem, in many cases, not entirely covering the internode regions, and by short leaflets, free from the upper part of leaf sheath and without leaf sheath expansions beyond the stem. Considering that the new taxon is an intermediate form between those classified in Phyllotheca and Koretrophyllites genera, the validity of the genus Koretrophyllites are discussed, using for this the comparison of the diagnostic features established to both genera.
Key words: Koretrophyllites, Phyllotheca, Sphenophyta, Early Permian, Paraná Basin, Rio Grande do Sul State.
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