Cyprideis kroemmelbeini ( Purper, 1979 )

Gross, Martin, Ramos, Maria Ines F. & Piller, Werner E., 2014, On the Miocene Cyprideis species flock (Ostracoda; Crustacea) of Western Amazonia (Solimões Formation): Refining taxonomy on species level, Zootaxa 3899 (1), pp. 1-69 : 19-20

Cyprideis kroemmelbeini ( Purper, 1979)

Fig. 4n ; Pl. 4, Figs. 9 –24, 26–27, 29

* 1979 Paulacoutoia kroemmelbeini Purper , sp. nov. —Purper: 236–237; Pl. 5, Figs. 18–24.

Material. 62 valves; samples AM 10/6–7.

Dimensions (total range over all samples). R ♀ l = 0.81–0.84 (0.83), h = 0.43–0.44 (0.44; n = 2); L ♀ l = 0.80–0.85 (0.83), h = 0.40–0.43 (0.42; n = 8); R ♂ l = 0.84–0.88 (0.86), h = 0.41–0.43 (0.42; n = 4); L ♂ l = 0.85–0.90 (0.88), h = 0.39–0.42 (0.41; n = 2); Rj(A-1) l = 0.64, h = 0.34 (n = 1); Lj(A-1) l = 0.62–0.69 (0.66), h = 0.32–0.36 (0.34; n = 2).

Remarks. The present specimens with their downward projecting anteroventral margin are identical in outline with P. kroemmelbeini as well as in all other characters. Purper (1979) did not explicitly mention an inverse hinge and had only two left valves available. However, based on her description as well as on the given figures (especially the dorsal views on Pl. 5, Figs. 19–20), an inverse hinge is probable (for differences from C. olivencai and C. machadoi see above).

Whatley et al. (1998) synonymised the genus Paulacoutoia Purper, 1979 with Cyprideis . By provisionally applying this concept, P. kroemmelbeini is named Cyprideis kroemmelbeini here.

Occurrence (of C. machadoi sensu Muñoz-Torres et al. 1998 ). Western Amazonia ( Brazil, Colombia, Peru), early Middle to early Late Miocene ( C. aulakos – C. cyrtoma zone; Muñoz-Torres et al. 2006; chronostratigraphic correlation after Wesselingh & Ramos 2010). Up to now only recognized in Brazil (core CPCAN-III-São Paulo de Olivença (depth: 19.50–20.78 m, altitude: ~ 33 m; Purper 1979).

4.5.4. paralela subgroup

Species. C. paralela , C. simplex , C. posterocompressus (the latter not among the current material and possibly an extreme form of C. paralela ).

Characters. Elongated-oval; small sized; smooth, asulcate; no marginal spines; moderately wide inner lamella with well-developed or reduced vestibulum, some with internal “eye-spot”; anterior long to short, bifurcated or simple pore canals; hinge: constantly inverse; rather short median element divided into a short anteromedian and an inconspicuous posteromedian element.

Figures

FIGURE 4. “Smooth” Cyprideis species of core 1AS-10-AM (except Figs. j–k = core 1AS-32-AM) photographed in transmitted light (external view) and focus stacked (scale bar = 200 µm; L/R = left/right valve; ♀/♂ = female/male; l/h = length/height [mm], specimen code = sample number_specimen number). a–c: C. amazonica, a: L♂ (0.84/0.46; AM10-39_44), b: R♀ (0.85/0.46; AM10-7_94), c: R♀ (0.74/0.42; AM10-39_42); d–f: C. machadoi, d: L♀ (1.09/0.58; AM10-23_66), e: L♀ (1.06/0.53; AM10-27_74), f: R♂ (1.08/0.51; AM10-27_73); g–k: C. kotzianae, g: R♂ (0.83/0.38; AM10-27_75), h: L♀ (1.00/ 0.46; AM10-30_36), i: R♂? (0.95/0.43; AM10-30_117), j: L♀ (0.87/0.41; AM32-5_26), k: R♀ (0.86/0.40; AM32-5_39); l–m: C. olivencai, l: L♀ (0.73/0.38; AM10-7_97), m: R♀ (0.75/0.38; AM10-7_96); n: C. kroemmelbeini, L♀ (0.83/0.41; AM10- 7_100); o: C. paralela, R♀ (0.61/0.30; AM10-30_100); p–r: C. multiradiata, p: L♀ (0.78/0.37; AM10-30_116), q: L♂ (0.89/ 0.38; AM10-30_114), r: R♂ (0.89/0.37; AM10-30_113).

FIGURE 9. Stratigraphic range of herein treated Cyprideis species mainly based on Muñoz-Torres et al. (2006; for details see chapters 4.5. and 4.6.; correlations of biozones and chronostratigraphy after Wesselingh et al. 2006b; Wesselingh & Ramos 2010; arrows: probably further extending into the Late Miocene, see Gross et al. 2013).