Cyprideis simplex ( Sheppard & Bate, 1980 )

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 : 21

Cyprideis simplex ( Sheppard & Bate, 1980)

Pl. 4, Figs. 46–50

* 1980 Botulocyprideis simplex sp. nov. —Sheppard & Bate: 104; Pl. 9, Figs. 6 , 8 –13.

1983 Botulocyprideis simplex Sheppard et Bate emend Purper et Pinto—Purper & Pinto: 116–117; Pl. 2, Figs. 17–27. 1985 Botulocyprideis simplex Sheppard & Bate, 1980 —Purper & Pinto: 427, 430; Fig. 2 .

Material. 6 valves; samples AM 10/39–40.

Dimensions (total range over all samples). R ♀ l = 0.73–0.76 (0.75), h = 0.38–0.40 (0.39; n = 2); L ♀? l = 0.77, h = 0.39 (n = 1).

Remarks. Only six adult valves were found, which are slightly less elongated in lateral view and somewhat larger than the given synonyms. However, other features enable their attribution to C. simplex (approximately parallel dorsal and ventral margins; smooth surface; avestibulate; numerous, simple or sometimes bifurcated pore canals; inverse hinge; no internal eye-spot; Sheppard & Bate 1980; Purper & Pinto 1983, 1985). By following Whatley et al. (1998), Botulocyprideis Sheppard & Bate, 1980 is a junior synonym of Cyprideis . For differences to C. paralela see above.

Occurrence. Western Amazonia ( Brazil: core 1AS-32-AM, depth: 107–132 m, altitude: -10 to - 35 m; Purper & Pinto 1983, 1985; Peru: “Pichua, W Cochaquinàs”; Sheppard & Bate 1980), Middle Miocene ( C. caraionae – C. minipunctata zone; according to Wesselingh et al. 2006b the outcrops around “Pichua” belong to mollusc zone 7; chronostratigraphic correlation after Wesselingh & Ramos 2010).

4.5.5. “Smooth” species not attributed to subgroups

Figures

FIGURE 2. Section of well 1AS-10-AM (γ-log, lithology, samples, macrofossil content and core intervals; based on unpublished CPRM report and own observations).

FIGURE 6. “Ornate” Cyprideis species of core 1AS-10-AM photographed in transmitted light (external view) and focus stacked (scale bar = 200 µm; for abbreviations, see Fig. 4). a–b: C. cyrtoma, a: R♀ (0.73/0.37; AM10-27_15), b: R♀ (0.79/ 0.41; AM10-30_51); c: C. schedogymnos, R♀ (0.77/0.39; AM10-42_20); d: C. aff. graciosa, R♂ (0.95/0.48; AM10-30_68); e: C. minipunctata, R♀ (0.80/0.44; AM10-42_26); f: C. curucae, R♀ (0.80/0.42; AM10-23_06); g: C. pebasae, L♀ (0.67/0.36; AM10-27_79); h–i: C. munoztorresi, h: L♀ (0.74/0.39; AM10-15_23), i: R♀ (0.75/0.38; AM10-15_25); j–k: C. ituiae, j: L♀ (0.64/0.33; AM10-23_105), k: R♀ (0.68/0.35; AM10-30_118); l–m: C. matorae, l: L♀ (0.80/0.43; AM10-30_121), m: R♂ (0.81/0.39; AM10-30_120); n: C. inversa, L♂ (0.58/0.32; AM10-30_122); o: C. sulcosigmoidalis, R♀ (1.01/0.59; AM10- 7_47).

FIGURE 8. Ostracod based biozonation of Muñoz-Torres et al. (2006) and remarks (correlations of biozones and chronostratigraphy after Wesselingh et al. 2006b; Wesselingh & Ramos 2010; FAD = first appearance datum and LAD = last appearance datum sensu Muñoz-Torres et al. (2006); s. MT = sensu Muñoz-Torres et al. (1998), s. P = sensu Purper (1979), syn. = synonymous).