Ilyocypris bradyi ( Sars, 1890 )

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

Ilyocypris bradyi ( Sars, 1890)

Fig.14 a-f

1890 Ilyocypris bradyi Sars , p. 59-60.

1962 Ilyocypris bradyi Sars - Jordan et al., p. 87, pl. 6, fig. 73.

2000 Ilyocypris bradyi Sars- Meisch, p. 253, fig. 107A-C.

2008 Ilyocypris bradyi Sars- Fuhrmann, p. 264, pl. 4, fig. 10-12.

2012 Ilyocypris bradyi Sars- Fuhrmann, p. 150, pl. 69, fig. 1a-f, 2a-d.

2018 Ilyocypris bradyi - Jorissen et al., p. 15, fig. 12 (23- 24).

Description. The carapace has a subrectangular shape in lateral view. The dorsal margin gently slopes towards the posterior end and passes onto it in an obtuse angle. The posterior is rounded and continues onto the ventral margin, which is concave mid-length. In the anterodorsal corner the anterior margin is lightly dipping, whereas the rest of the anterior end is rounded. The greatest height is observed in the anterior third of the carapace but anterior-and posterior margins are almost equally wide. The valves bear two distinguishable dorso-median and vertical running furrows on which path between three to five tubercles, set in two rows, can be observed. The tubercles can be more or less prominently developed and in rare cases as spines, located near the dorsal margin. The surface of the valve shows a rounded to slightly elongate and shallow pitted ornamentation that becomes less pronounced towards the anterior-and the posterior margin. On the posterior end minor sized spinules can be present. The inner lamella is narrowly pronounced. Other internal features are excluded from our description due to adverse preservation. Dimension: L = 0,33 – 0,85 mm, H = 0,30 – 0,44 mm, the minimum sizes include juveniles too.

Chronostratigraphical and geographical distribution. I. bradyi shows a widespread distribution throughout Europe and has further been reported from Africa, the Middle East, Central Asia, China and North America ( Meisch, 2000). This species has been described in the fossil record from the Miocene and Pliocene ( Kazmina 1975; Tunoğlu and Çelik 1995) and the Pleistocene to Recent ( Meisch, 2000). Inside the Paratethyan domain it has been obtained from a variety of basins, e.g., the upper Maeotian (Bădislava and Toplog sections) and Dacian (Slănicul de Buzău) of the Dacian Basin (Romania) ( Floroiu et al., 2016; Jorissen et al., 2018), the upper Productive Series (Surakhany Fm., Kimmerian age) and the Akchagylian-Apsheronian of the South Caspian Basin of Azerbaijan (Van Baak et al., 2013; Lazarev et al., 2019) and the middle Pannonian of the Gelibolu Peninsula (NW Turkey) (Tunoğlu and Ünal, 2001). Further is appears during the Piacenzian–Gelasian in the Tiberino Basin in the Central Apennines of Italy ( Spadi et al., 2019) and the Quarternary deposits of the Gorgan plain in North Iran (Yassini, 1987). According to Agalarova et al. (1961) and Mandelstam et al. (1962), it also occurs in the Pliocene and post-Pliocene deposits of Azerbaidjan, Turkmenistan SSR and Caucasus region.

Ecology. The living representatives of I. bradyi prefer cooler freshwater springs and can be found in slow flowing waters that fed small ponds, rivers, swamps or lakes ( Henderson, 1990; Meisch, 2000). The species has been further mentioned from slightly salty inland waters of Germany, Poland and brackish coastal waters from Belgium ( 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).