Jenningsina paffrathensis Krömmelbein, 1954

Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel & Posada, Luis-Carlos Sánchez De, 2016, Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications, Zootaxa 4068 (1), pp. 1-78 : 41

Jenningsina paffrathensis Krömmelbein, 1954

(Pl. III: Fig. 2 )

1954a Jenningsina paffrathensis nov. sp.; Krömmelbein: 255–256, pl. 2, fig. 10. 1964 Jenningsina sp. F; Magne: pl. 24, figs. 175–177.

? 1964 Jenningsina cf. sp. F; Magne: pl. 23, figs. 144–145, pl. 24, figs. 172–174.? 1964 Jenningsina sp. G2; Magne: pl. 22, fig. 132.

1982 Jenningsina sp. G2 Magne; Milhau: 22, pl. 5, fig. 118.

1983a Jenningsina lethiersi Becker ; Milhau: 351, pl. 1, fig. 2.

1983a Jenningsina sp. indet.; Milhau: 353.

1985 Jenningsina paffrathensis Krömmelbein ; Coen: 20, pl. 6, fig. 7.? 1988 Jenningsina sp. G2 Magne; Milhau: 486, pl. 56, fig. 21.

2009 Jenningsina paffrathensis Krömmelbein ; Casier in Casier & Préat: pl. 5, fig. 13. 2010 Jenningsina paffrathensis Krömmelbein ; Maillet: 40, pl. 2, fig. 29. 2013 Jenningsina paffrathensis Krömmelbein ; Maillet: 120, pl. XV, figs. 22–23. 2013b Jenningsina paffrathensis Krömmelbein ; Maillet et al., fig. 6M.

Material. 64 specimens (43 C, 10 V, 11 F).

Diagnosis. Krömmelbein (1954a, p. 255).

Description. Medium-sized elongated carapace, bean-shaped in lateral view. Very slight overlap of the larger LV over the RV dorsally. Hmax at 1/4 anterior; Lmax at 2/5 ventral; Wmax median. Dorsal margin oblique posteriorly to Hmax point. Almost straight (very slightly concave) ventral margin. Ventral and dorsal margins converging posteriorly. Well rounded anterior margin, regularly convex in its dorsal part, more arched in its ventral part. Well rounded posterior margin, oblique anteriorly from dorsal to ventral part. Free margins of the carapace flattened. Anterior part of the carapace higher than posterior one. Whole surface reticulated. Reticulation globally orientated longitudinally, with fine reticles diverging posteriorly from the median longitudinal line of the valves. Marked posterior vertical shoulder, with more nodular dorsal and ventral extremities, longing the posterior margin.

Discussion. This species may be a synonym of Jenningsina lethiersi Becker, 1971 (ecomorphism?), whose morphology of carapace as well as the general pattern of reticulation are identical to J. paffrathensis , with the exception of the size of the reticules. Moreover, the two species are frequently associated within a same stratigraphical level (e.g. Maillet 2013 and Casier et al. 2013 for the Ardenne; this paper for the Asturias).

Occurrences. Upper Givetian to Lower Frasnian (Fromelennes Fm, Fort Hulobiet Mb, and Nismes and Presles Fms), Ardenne (Flohimont, Cul d’Houille, Aisemont, Nismes and Aisne sections), Upper Givetian to Lower Frasnian (Candás Fm, mbs C and D), Asturias (Peran-Perlora and Carranques sections); Upper Givetian, Eifel and Boulonnais.

Figures

FIGURE 2. Simplified stratigraphical column of the Candás Formation, standard conodont zonation and chronostratigraphy (according to García-Alcalde et al. 1979; García-López 1986 and García-López et al. 2002).