Ilyocypris gibba ( Ramdohr, 1808 )

RAUSCH, LEA, STOICA, MARIUS & LAZAREV, SERGEI, 2020, A Late Miocene - Early Pliocene Paratethyan Type Ostracod Fauna From The Denizli Basin (Sw Anatolia) And Its Palaeogeographic Implications, Acta Palaeontologica Romaniae 16 (2), pp. 3-56 : 22-24

Ilyocypris gibba ( Ramdohr, 1808)

Fig. 14 g-j

1808 Cypris gibba - Ramdohr, p. 91, pl. III, figs, 13-17.

1900 Ilyocypris gibba (Ramdohr) - Müller, p. 88, pl. 19. figs. 7,12.

1949 Ilyocypris gibba (Ramdohr) - Schweyer, p. 56, pl. V, fig. 8.

1969 Ilyocypris gibba (Ramdohr) - Carbonnel, p. 27, plansa 11, fig. 7.

1995 Ilyocypris gibba (Ramdohr) - Olteanu, pl. XXXIV; fig.10, 11.

2000 Ilyocypris gibba (Ramdohr) - Meisch, p. 245, fig. 104 A-C.

2012 Ilyocypris gibba (Ramdohr) - Fuhrmann, p. 156, pl. 72, fig. 1a-f, 2a-d.

2013 Ilyocypris ex. gr. gibba (Ramdohr) - Van Baak et al., p. 124, fig. 4a, 7,8, p. 125, fig. 5a, 6,7.

2015 Ilyocypris gibba (Ramdohr) - Van Baak et al., p. 602, fig. 7b, 29-32.

Description. The carapace has a subquadrate to subrectangular shape in lateral view. The dorsal margin runs straight and parallel to the ventral margin that is concave mid-length. The anterior-and posterior ends are broadly rounded and denticulate. The valves surface is coarsely puncated and traversed by two vertical running furrows. Tubercles are not present. Due to poor preservation no internal features could be described. Dimension: L = 0,53 – 0,81 mm, H = 0,31 – 0,43 mm, the minimum sizes include juveniles too.

Chronostratigraphical and geographical distribution. Today I. gibba is showing a widespread distribution throughout Europe, Africa, the Middle East, Central Asia and both North and South America ( Meisch, 2000). In the fossil record I. gibba has been described from the lower Miocene and Pliocene of Central Anatolia ( Tunoğlu & Celik, 1995) and in Plio-Pleistocene deposits of the Dacian Basin (Romania) (Van Bakk et al., 2015; Jorissen et al., 2018). It has also been mentioned by Agalarova et al. (1961) and Mandelstam and Schneider (1963) within Pliocene and post-Pliocene deposits of Azerbaijan, Turkmenistan SSR, Kirmea and Caucasus.

Ecology. Recent living specimens of I. gibba preferably occur in small permanent water bodies with a finemudded, clayey-or sandy substrate. The species has also been reported from temporary pools, springs, slightly salty waters and rice fields ( Meisch, 2000). Together with C. ex. gr. torosa and C. neglecta Sars it has been described from freshwater assemblages from the Romanian stage of the Slănicul de Bazău section in the Dacian Basin (Van Baak et al., 2015). Living specimens are ecologically characterized as meso- to polythermohaline, rheoeuryplastic with oligohalophilic summer forms ( Meisch, 2000; Fuhrmann, 2012).

Figures

Fig. 14a-f Ilyocypris bradyi; a, b RV, external view, c LV, external view; d RV, external view, A1 juvenile; e LV, external view, A1 juvenile; f. LV, external view, A2 juvenile; g-j Ilyocypris gibba; g LV, external view; h RV, external view; i RV, external view, A1 juvenile; j RV, external view, A2 juvenile; (all samples from section B; a-f from 29,5 m and g-j from sample 184,5 m).