TERTIARIUS HIDALGENSIS SP NOV., A NEW DIATOM SPECIES FROM NEOGENE DEPOSITS IN CENTRAL MEXICO
Por:
Caballero M., Khursevich G., de Leon, PV
Publicada:
1 may 2009
Categoría:
Aquatic Science
Resumen:
A new species, Tertiarius hidalgensis (Bacillariophyta: Stephanodiscaceae), studied with light (LM) and scanning electron microscopy (SEM), is described from Pliocene sediments in central Mexico. This species possesses simple and complex alveolae formed by thickened hyaline strips, a single raised rimoportula located within one of the alveolar chambers, 4 to 10 valve face fultoportulae bounded by 2 or by 2 and 3 satellite pores, and mantle fultoportulae with 2 satellite pores positioned above thick internal costae on the surrounding wall. T. hidalgensis is apparently an extinct species of biostratigraphic significance; it extends the geographic distribution of this genus into tropical latitudes and gives further evidence of the great diversity that the freshwater Stephanodiscaceae reached during the Neogene.
Filiaciones:
Caballero M.:
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
Khursevich G.:
Department of Botany, M. Tank State Pedagogical University, 18 Sovetskaya street, Minsk, 220809, Belgium
de Leon, PV:
Univ Nacl Autonoma Mexico, Fac Estudios Super Zaragoza, Mexico City 09230, DF, Mexico
|