Balantoides brauni ( Becker, 1968 )

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 : 18

Balantoides brauni ( Becker, 1968)

(Pl. I: Fig. 7)

1964 Pseudonodellina cf. strelniensis Polenova, 1955; Magne: pl. 18, fig. 44. 1968 Aechminella brauni nov. sp.; Becker: 558–560, pl. 1, figs. 3–4. 1982 Aechminella cf. brauni Becker ; Milhau: 19, pl. 2, figs. 20–21. 1983a Aechminella brauni Becker ; Milhau: 351, pl. 1, fig. 18–19.

1983b Aechminella brauni Becker; Milhau: 221, 228–229.

1983 Balantoides parvulus ( Polenova, 1953) ; Żbikowska: 35, pl. 7, figs. 4–5. 1985 Balantoides brauni (Becker) ; Coen: pl. 3, fig. 11–12.

1988 Aechminella brauni Becker ; Milhau: 484, pl. 56, fig. 31.

1991 Balantoides brauni (Becker) ; Casier in Casier & Préat: pl. 1, fig. 18. 1994 Balantoides aff. brauni (Becker) ; Gozalo: 84, pl. 11 fig. 11.

2006 Balantoides sp. A, aff. brauni (Becker) ; Casier in Casier & Préat: pl. 2, fig. 3. 2009 Balantoides brauni (Becker) ; Maillet: 12, pl. 1, fig. 7.

2010 Balantoides brauni (Becker) ; Maillet: 40, pl. 1, figs. 23–24.

2013 Balantoides brauni (Becker) ; Maillet: 51, pl. V, figs. 12–14.

2013b Balantoides brauni (Becker) ; Maillet et al.: fig. 5c.

Material. 5 specimens (5 C).

Diagnosis. Becker (1968, p. 558).

Description. Small, slightly preplete carapace. Overlap of the larger LV over the RV on the whole outline, more pronounced ventrally. Hmax at 1/3 posterior; Lmax slightly dorsal; Wmax about at mid-dorsal. Straight hinge line and dorsal margin. Cardinal angles of about 120°. Well rounded and regularly convex free margins. Anterior part of the carapace slightly higher than the posterior one. Long sulcus in the posterior part of both valves, extending from the dorsal to the ventral margins. Marked adductorial sulcus at mid-dorsal and slightly anterior. Two lobes, framing the adductorial sulcus, merged into an oblique shoulder projecting over the dorsal margin. Surface very finely reticulated.

Discussion. The two lobes merged in an oblique shoulder over the dorsal margin are a feature of this typical Givetian species, also characterized by its small-size.

Occurrence. Lower and Middle Givetian (Névremont, Terres d’Haurs and Mont d’Haurs Fms, and Fromelennes Fm, Flohimont Member), Ardenne (Flohimont, Cul d’Houille, Aisemont and Aisne sections), Middle Givetian (Candás Fm, mb C), Asturias (Peran-Perlora section); Givetian, Boulonnais, Eifel and Poland.