Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications
Author
Maillet, Sebastien
Author
Milhau, Bruno
Author
Vreulx, Michel
Author
Posada, Luis-Carlos Sánchez De
text
Zootaxa
2016
4068
1
1
78
journal article
10.11646/zootaxa.4068.1.1
b9c1e3a3-e591-4b34-9f30-d6d88a230673
1175-5326
270644
80E89736-33F2-4FF5-9B01-8B7239407875
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.