Prionocypris zenkeri ( Chyzer, 1858 )

Rausch, Lea & Stoica, Marius, 2019, AN EARLY PLEISTOCENE ANOMALOHALINE WATER OSTRACOD FAUNA FROM LAKE DEPOSITS OF THE HOMO ERECTUS-BEARING KOCABAŞ LOCALITY (SW TURKEY), Acta Palaeontologica Romaniae 15 (2), pp. 41-69 : 2

Prionocypris zenkeri ( Chyzer, 1858)

1858 Cypris zenkeri - Chyzer, p. 514. n.sp.

1975 Prionocypris - Diebel &

zenkeri (Chyzer, Wolfschläger, p. 111, pl. 1858) 18a-b.

1984 Prionocypris - Diebel & Pietrzeniuk, zenkeri (Chyzer, p. 306, pl. 7, fig. 7-8.

1858)

2000 Prionocypris - Meisch, p. 299, fig.

zenkeri (Chyzer 126A-C.

& Toth, 1858)

2012 Prionocypris - Fuhrmann, p. 200, pl. zenkeri (Chyzer 94, figs. 2a-f.

& Toth, 1858)

Description. The carapace is subovate to elongate in lateral view and has its greatest width slightly in front of the mid-length. Both, the anterior-and the posterior end, are end broadly rounded. The ventral margin is almost straight, but shows a slight depression mid-length. The dorsal margin is slightly arched shaped and steeply sloping down the anterior end as well as constantly inclining towards the posterior. The outer anterior margin of both valves (LV slightly longer than RV) posses 5-10 wartlike elevations (porenwarzen). The postero-ventral margin of both valves shows more than 10 fine spines, visible on well preserved specimens only. The fused zone and inner lamella are pronounced narrow in the posterior and moderate in the anterior end. The valves surface of the adults is covered by fine dense pits and polygonal fine reticulation on juveniles. Dimension: l = 1,30– 1,45 mm, h = 0,70–0,75 mm.

Ecology. The species is described from low energy streams that are rich in vegetation and less common in deeper and stagnant water bodies. It has also been found in ponds with cold water influx, living on calcareous substrates ( Meisch, 2000; Fuhrmann, 2012). The fossil record of the species ranges from the Lower Pleistocene to Recent ( Meisch, 2000).