Cyprideis multiradiata ( 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 : 21-22

publication ID	https://doi.org/ 10.11646/zootaxa.3899.1.1
publication LSID	lsid:zoobank.org:pub:D78F2010-08E1-45C0-86FF-7F2D3601070D
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treatment provided by	Felipe
scientific name	Cyprideis multiradiata ( Purper, 1979 )
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Cyprideis multiradiata ( Purper, 1979)

Figs. 4p–r View FIGURE 4 ; Pl. 5, Figs. 1 View FIGURE 1 –30

1977 Ostracoda A n.g.,n.sp.—Purper: 359; Pl. 1, Figs. 1–8 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 .

* 1979 Amazonacytheridea multiradiata Purper , gen. et sp. nov. —Purper: 234–235; Pl. 5, 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 .

1985 Amazonacytheridea multiradiata Purper, 1979 —Purper & Pinto: 427, 430; Fig. 3 View FIGURE 3 . pars 1998 Cyprideis olivencai ( Purper, 1979) —Muñoz-Torres et al.: 100; Pl. 4, Figs. 7 View FIGURE 7 ,?5. [non Pl. 4, Fig. 6 View FIGURE 6 ]

pars 1998 Cyprideis olivencai ( Purper, 1979) —Whatley et al.: 236; Text-fig. 2 (lowermost row, left drawing); Pl. 2, Figs. 4–5 View FIGURE 4 View FIGURE 5 ,?3 [sic]. [non Pl. 2, Figs. 1–2 View FIGURE 1 View FIGURE 2 [sic]]

Material. 958 valves; samples AM 10/3, 15, 19–30, 40, 42.

Dimensions (total range over all samples). R ♀ l = 0.65–0.87 (0.77), h = 0.31–0.41 (0.36; n = 119); L ♀ l = 0.72–0.89 (0.79), h = 0.36–0.42 (0.38; n = 16); R ♂ l = 0.74–0.89 (0.82), h = 0.31–0.39 (0.35; n = 12); L ♂ l = 0.74–0.89 (0.82), h = 0.33–0.40 (0.37; n = 11); Rj(A-1) l = 0.63–0.67 (0.65), h = 0.30–0.32 (0.31; n = 4); Lj(A-1) l = 0.62–0.66 (0.64), h = 0.30–0.33 (0.32; n = 6).

Remarks. This smooth, asulcate, elongated-ovate species occurs regularly throughout the productive samples of the studied core. Characteristic are: the very wide, anteroventrally additionally enlarged inner lamella with a vestibulum ( Figs. 4p–r View FIGURE 4 ); the anterior polyfurcated, ventral and posterior simple or bifurcated marginal pore canals as well as the hinge (long, elongated, denticulated anterior and posterior elements; very short, inconspicuously divided, crenulated median element; Purper 1979). More elongated and posteriorly more tapered male valves express sexual dimorphism. While the inner lamella is frequently wider posteroventrally and the anterior vestibulum is usually larger in males, the hinge elements are more strongly developed in female specimens.

Through its occurrence in our core, these diagnostic features remain stable. Evolutionary tendencies as described by Purper & Pinto (1985) have not been observed in our material (e.g. variations of the anteroventral inflection of the inner lamella). However, the outline varies notably (from ovate to very elongated) between samples but without clear, “directed” trend. On plate 5 we illustrate typical (Pl. 5, Figs. 9–10 View FIGURE 9 View FIGURE 10 ; according to the original description of Purper 1979) as well as extreme morphotypes. Variability of size is shown in figure 5.

Muñoz-Torres et al. (1998) and Whatley et al. (1998) synonymised Amazonacytheridea multiradiata as well as Pseudoparakrithella paralela Purper, 1979 and Botulocyprideis simplex Sheppard & Bate, 1980 with Cyprideis olivencai ( Purper, 1979) , which in turn became a collective species (see chapters 4.5.3. and 4.5.4.). Due to the constant occurrence of the multiradiata -morphotype, which does not show transitions to C. olivencai , C. paralela and C. simplex , A. multiradiata appears to form a distinct taxon and is revalidated here. According to the generic concept of Whatley et al. (1998) —which we follow with reservation— Amazonacytheridea Purper, 1979 is a junior synonym of Cyprideis and A. multiradiata turns into Cyprideis multiradiata .

Occurrence (of C. olivencai 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 (cores CPCAN-III-São Paulo de Olivença and CPCAN-I-Tamanduá; Purper 1979; core 1AS-32-AM; Purper & Pinto 1985).

4.6. “Ornate” Cyprideis group

4.6.1. cyrtoma subgroup

Species. C. cyrtoma , C. schedogymnos ; probably C. krsticae (not among the present material, re-examination pending).

Characters. Subrectangular; medium sized; almost smooth to punctate, weakly sulcate; short anteromarginal spines (both valves) restricted to the lower half of anterior margin, some posteroventral denticles or spines only in right valves; moderately wide inner lamella, avestibulate; anterior simple or bifurcated marginal pore canals; generotypic hinge.