Cyprideis aff. graciosa ( 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 : 25-26

publication ID	https://doi.org/ 10.11646/zootaxa.3899.1.1
publication LSID	lsid:zoobank.org:pub:D78F2010-08E1-45C0-86FF-7F2D3601070D
persistent identifier	https://treatment.plazi.org/id/017587FE-FFB4-FFDE-71F4-DDA8FE12FF25
treatment provided by	Felipe
scientific name	Cyprideis aff. graciosa ( Purper, 1979 )
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Treatment

Cyprideis aff. graciosa ( Purper, 1979)

Fig. 6d View FIGURE 6 ; Pl. 6, Figs. 33–34; Pl. 7, Figs. 1 View FIGURE 1 –20

? 1977 Cytheridea sp. nov. D—Purper: 363; Pl. 3, Figs. 5–6 View FIGURE 5 View FIGURE 6 .

? * 1979 Cytheridea graciosa Purper , sp. nov. —Purper: 229–230; Pl. 3, Figs. 1–9 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 .

? 1991 Cytheridea graciosa Purper, 1979 —Purper & Ornellas: 26–28; Pl. 1, Figs. 10 View FIGURE 10 –15.

? 1998 Cyprideis graciosa ( Purper, 1979) —Muñoz-Torres et al.: 96; Pl. 3, Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 .

? 1998 Cyprideis graciosa ( Purper, 1979) —Whatley et al.: 234; Text-fig. 2; Pl. 1, Figs. 11–15.

? 2006 Cyprideis graciosa Purper, 1979 —Ramos: 92; Figs. 7d–h View FIGURE 7 .

? 2009 Cyprideis graciosa Purper, 1979 —Ramos et al.: 114; Fig. 289-I.

? 2010 Cyprideis graciosa Purper, 1979 —Wesselingh & Ramos: 308; Figs. 18.5e–f.

? 2011 Cyprideis graciosa —Linhares et al.: 96; Figs. 3 View FIGURE 3 /9–10.

? 2013 Cyprideis graciosa ( Purper, 1979) —Gross et al.: 225; Pl. 4, Figs. 1 View FIGURE 1 –17.

Material. 319 valves; samples AM 10/15–16, 19, 22–30.

Dimensions (total range over all samples). R ♀ l = 0.76–0.91 (0.82), h = 0.40–0.49 (0.44; n = 8); L ♀ l = 0.72–0.92 (0.83), h = 0.38–0.49 (0.45; n = 10); R ♂ l = 0.80–0.95 (0.89), h = 0.39–0.48 (0.43; n = 4); L ♂ l = 0.83–0.98 (0.91), h = 0.42–0.49 (0.45; n = 6); Rj(A-1) l = 0.63–0.66 (0.65), h = 0.37–0.39 (0.38; n = 3); Lj(A-1) l = 0.64–0.70 (0.68), h = 0.38–0.40 (0.39; n = 3); Rj(A-2) l = 0.55–0.56 (0.56), h = 0.30–0.31 (0.30; n = 3); Lj(A-2) l = 0.52, h = 0.27 (n = 1) .

Remarks. C. graciosa is a moderately large, subrectangular to subtriangular form with a pitted ornament, with about eight strong and widely spaced spines along the entire anterior margin and about four posteroventral spines of which the lowermost one is the most developed. The anteroventral and anterocentral surface ornament tends to be reduced, forming a low reticulum (sometimes with weakly developed, secondary fine puncta) or is almost smooth ( Purper 1979; Purper & Ornellas 1991; Ramos 2006; Wesselingh & Ramos 2010; Gross et al. 2013).

The present material may range within the variability of C. graciosa in a wider sense. However, posteroventral spines are not developed in left valves of the present material, which are a characteristic feature according to Purper (1979) and Purper & Ornellas (1991). Equally, posteroventral spines are not visible in the figured specimens of Muñoz-Torres et al. (1998), Whatley et al. (1998) and Linhares et al. (2011). However, such spines are mentioned in the descriptions provided by the former authors. As discussed by Gross et al. (2013), it remains unclear if solely the occurrence or absence of posteroventral spines in left valves is species diagnostic or not. Provisionally, we attribute our specimens to C. aff. graciosa .

Similar species are Cyprideis anterospinosa Purper & Ornellas, 1991 and Cyprideis marginuspinosa ( Purper & Ornellas, 1991) . The former diverges by its more rounded dorsal margin, the less concave ventral margin, a punctate surface, small posteroventral spines in right valves and the anteromarginal spines are restricted to the anteroventral margin ( Purper & Ornellas 1991).

C. marginuspinosa is punctate, has small posteroventral spines in right valves (but note the well-developed spine of the specimen on Pl. 2, Fig. 5 View FIGURE 5 in Purper & Ornellas 1991), a more rounded posterocardinal angle and anteromarginal spines that only slightly exceed half of the valves’ height ( Purper & Ornellas 1991).

Somewhat comparable is C. longispina , which differs from C. graciosa by: e.g. its significantly extended posteroventral flange in right valves, which holds usually one more horizontally directed posteroventral spine; a posteroventral spine in left valves is never developed; its anterior spines are restricted to the lower half of the anterior margin; and the ornament is reduced in the anteroventral area only ( Gross et al. 2013).

Occurrence (of C. graciosa ). Western Amazonia ( Brazil, Colombia, Peru), latest Middle to early Late Miocene ( C. obliquosulcata – C. cyrtoma zone; Muñoz-Torres et al. 2006; chronostratigraphic correlation after Wesselingh & Ramos 2010).