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 Bairdia ( Rectobairdia ) sp. P5 (Pl. IV: Fig. 9) 2013 Bairdia ( Rectobairdia ) sp. P5; Maillet: 165, pl. XXVI, fig. 4. Material. 1 specimen (1 C). Description. Medium-sized, very elongated carapace, subhexagonal in lateral view, biconvex in dorsal view. Overlap of the larger LV over the RV along the whole outline, very slight anteriorly. Bow-shaped projection in ventral view. Hmax at 2/7 anterior; Lmax at 2/5 ventral; Wmax slightly posterior. Dorsal margin straight on 2/3 of Lmax in its middle part, very oblique and concave posteriorly, very slightly oblique and concave anteriorly. Ventral margin straight, becoming convex at its extremities. Dorsal and ventral margins parallel. Anterior margin slightly concave in its dorsal part to the anterior end point about at 1/4 dorsal of Hmax, and, from this point, regularly convex in its ventral part. Carapace slightly flattened in its ventral part along the anterior margin. Posterior margin oblique and concave in its dorsal part to the posterior end (posterior Lmax point), and from this point, slightly convex in its ventral part. Posterior end sharp, forming an angle of about 80°. Anterior end of carapace clearly higher than posterior one. Anterior part of carapace higher than posterior one. Surface smooth. Discussion. This particularly elongated single specimen with a very straight carapace undoubtedly belongs to the Rectobairdia subgenus. However, it might enter into the variability domain of Bairdia paffrathensis Kummerow, 1953 (see Żbikowska 1983 ). Occurrences. Middle Givetian (Candás Fm, mb C), Asturias (Peran-Perlora section).