Fottea, 2015 (vol. 15), issue 1

Fottea 15(1): 51-62, 2015 | 10.5507/fot.2015.005

Two new Tertiarius (Bacillariophyta, Coscinodiscophyceae) species from Mariovo Neogene Basin, Macedonia

Nadja Ognjanova-Rumenova1, Elena Jovanovska2,3, Aleksandra Cvetkoska4, Zlatko Levkov2
1 Department of Paleontology, Stratigraphy and Sedimentology, Institute of Geology, Bulgarian Academy of Science, Acad. G. Bonchev str. Bldg. 24. 1113 Sofia, Bulgaria; E-mail: nognjan@geology.bas.bg
2 Institute of Biology, Faculty of Natural Sciences, Ss. Cyril and Methodius University, Arhimedova 3, 1000 Skopje, R. Macedonia
3 Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany 4Palaeoecology, Department of Physical Geography, Faculty of Geosciences, Utrecht University, Heidelberglaan 2, Utrecht, The Netherlands

The morphology, biostratigraphy and ecology of two new species, Tertiarius jurijlii and Tertiarius mariovensis are presented. The valve morphological variation and ultrastructure are described by light and scanning electron microscopy. Tertiarius juriljii is distinguished by the presence of hyaline area on the valve face; central area comprised of areolae arranged in single short or long radial rows; presence of small to large granules on the interstriae; and valve face fultoportulae arranged in radial rows around the valve center. Comparatively, in Tertiarius mariovensis the hyaline area around the central area is missing, and the taxon is characterized by tri- to biseriate striae in the central part of the valve face becoming uniseriate towards the valve centre and stalked rimoportula positioned between two costae inside the alveolar opening. Both species are found in nonmarine sediments of Pliocene age from Mariovo Basin, Macedonia.

Keywords: Biostratigraphy, Macedonia, morphology, systematic relationships, Tertiarius juriljii, Tertiarius mariovensis

Received: June 6, 2014; Accepted: November 12, 2014; Published: April 22, 2015

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