CABALERI nora Graciela
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Volkheimerites labyrinthus, a new striate angiosperm pollen from the Paleogene of Patagonia, Argentina
NARVAEZ, P. L.; MEGO, N.; SILVA NIETO, D. G.; PRAMPARO, M.B.; CABALERI, N. G.
Simposio; 54th Annual Meeting of AASP-The Palynological Society; 2022
Volkheimerites labyrinthus shares the presence of a coarse semitecate tectum supported by columellae with the fossil genera Dichasto-pollenites (Nymphaeaceae),Trisectoris and Periretisyncolpites (Schisandraceae), and with some Winteraceae and Annonaceaespecies, but differs in having striate-labyrin-thine or dichotomous-radiate as opposed to a reticulateornamentation. Volkheimerites is also distinctive by the occurrence of so-litary grains (monads) instead of the more frequent presence of tetrads in the Winte-raceaefamily or grains separated into twohemispheres as in Dichastopollenites. The large thin area of the exine appears to be morphologically analogous to the proximal thinning of the exine in the monads making up the tetrads as occurs in some Annona-ceae species. Despite the morphological traits shared with the described genera and families, Volkheimerites labyrinthus could not be assigned a botanical affinity, probably con-sisting of an extinct taxon not closely related to any extant family.