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 Cavellina ? wahlensis Coen, 1985 (Pl. II: Fig. 6 ) 1964 Ostracode indet. G5; Magne: pl. 19, figs. 62–63. 1982 Silenites ? sp. G Magne, 1964; Milhau: 21, pl. 4, fig. 102 1985 Cavellina ? wahlensis nov. sp.; Coen: pl. 5, figs. 9–10. 1988 Cavellina ? wahlensis Coen; Milhau: 485, pl. 55, fig. 22. 1988 Silenites ? sp. G Magne, 1964; Milhau: 487, pl. 56, fig. 46. 1993 Cavellina ? wahlensis Coen; Kasimi: pl. 16, fig. 27. 2013 Cavellina ? wahlensis Coen; Maillet: 84, pl. X, figs. 14–15. 2013 Cavellina ? wahlensis Coen; Casier in Casier & Préat: 488, pl. IV, fig. 3. Material. 10 specimens (6 C, 2 V , 2 F). Diagnosis. Coen (1985, p. 17–18) . Description. Medium-sized carapace with a sub-triangular rounded outline in lateral view. Carapace very flat in dorsal view. The larger RV slightly overlaps the LV on the whole outline. Hmax: median; Lmax: 1/3 ventral; Wmax: slightly ventral. Very arched and convex dorsal margin. Slightly concave ventral margin. Well rounded anterior and posterior margins, more convex ventrally. Anterior and posterior parts of the carapace symmetric. Surface smooth. Discussion. A questionable Cavellina with an atypical very flat and large carapace for this genus. As frequently seen in cavellinids, a sexual dimorphism is known in this species (see Coen 1985 ). Occurrence. Lower to Middle Givetian (Trois-Fontaines, Névremont and Mont d’Haurs Fms), Ardenne (Flohimont, Cul d’Houille, Jemelle and Aisemont sections), Middle Givetian (Candás Fm, mb B), Asturias (Peran- Perlora section); Givetian, Boulonnais.