Cavellina

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 : 27-29

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.

Figures

FIGURE 6. Faunal relations and Middle Devonian palaeogeographic reconstruction. Abbreviations: Ard: Ardenne (Namur and Dinant Synclinoria); Arm: Armorican Massif; Bhm: Bohemian Massif; Bln: Boulonnais; CcA: Carnic Alps; Ctz: Cantabrian Zone; Dvs: Devonshire; Grm: Germany (Eifel, Ruhr, Sauerland, Bergisches Land, Thuringia, Harz); IbC: Iberian Cordillera; Mth: Mouthoumet Massif; MtN: Montagne Noire; NMc: North Morocco (Doukkala, Meseta); OMZ: Ossa Morena Zone; Pld: Poland (Holy Cross Mountains, Pomerania); Ptd: Pontides; Rus: Russia (Volga and Urals areas; Baschkiria); Sao: Saoura; SMc: South Morocco (Anti-Atlas, Tafilalt); Tns: Tunisia; Trd: Taurides; Ygv: Ex-Yugoslavia (Serbia). For the reviewed literature on Givetian ostracods of those areas, see text. A. Faunal affinities between the Cantabrian Zone and other places in Europe and neighbouring areas during the Givetian; B. Middle Devonian palaeogeographic reconstruction (adapted from Blakey 2007).