New Congerian Species and Their Similarity with Congeria banatica from the Pannonian Sediments in Northern Croatia

Abstract

Congeria baschi n.sp. and Congeria susedana n.sp. are two newspecies from the Pannonian sediments of the Medvednica Mts. (NWCroatia). C. baschi n. s p . was found in the Lower Pannonian limestones,and C. susedana n.s p . was collected from the Upper Pannonianmarls.Relationships with the affiliated taxa enable reconstruction of aphyletic lineage beginning with Congeria soceni JEKELIUS, throughC. baschi n.sp. to Congeria banatica H RNES. C. banatica is theancestor of two branches, leading to C. susedana n. sp. and C. vugro -veci SREMAC, respectively. Dreissenomya digitifera (ANDRUSOV)is the probable descendant of C. vugroveci.The accompanying assemblages of fossil molluscs and ostracodsfrom the same horizons facilitate the precise stratigraphic andpalaeoenvironmental positioning of the new taxa.

Keywords

• Pannonian Lake, Miocene, Pannonian Basin, NW Croatia, Congeria, Bivalvia, New species, Endemic evolution