Parabolbinella coeni Casier, 2011

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 : 15

Parabolbinella coeni Casier, 2011

(Pl. I: Fig. 4 )

1983a Falsipollex sp. Groos, 1969; Milhau: 351.

1985 Falsipollex ? sp.; Coen: pl. I, fig. 5.

1988 Falsipollex ? sp. 3G; Milhau: 486, pl. 55, fig. 10.

1990 Parabolbinella ? sp.; Casier in Casier & Préat: pl. 1, fig. 8.

1991 Falsipollex ? sp. 3G Milhau, 1988; Casier in Casier & Préat: pl. 1, fig. 8. 1992 Falsipollex ? sp. 3G Milhau, 1988; Casier in Casier et al.: 77, 83, pl. 1, fig. 8. 1993 Falsipollex ? sp. 3G Milhau, 1988; Kasimi: pl. 16, figs. 14–15.

1995 Falsipollex ? sp. 3G Milhau, 1988; Casier in Casier et al.: 494, pl. 64, fig. 6. 2006 Hollinella cf. praecursor Pokorńy, 1951; Casier in Casier & Préat: pl. 1, fig. 13. 2009 Falsipollex sp. (cf. F. sp. 3G Milhau, 1988); Maillet: 12, pl. 1, fig. 25. 2009 Hollinella sp.; Maillet: 12.

2010b Parabolbinella nov. sp. A (= Falsipollex ? sp. 3G in Milhau, 1988); Casier in Casier et al.: pl. 4, fig. 4. 2010 Parabolbinella cf. postaculeata Adamczak, 1968; Maillet: 40, pl. 3, figs. 16–17. 2011a Parabolbinella coeni nov. sp.; Casier in Casier et al.: 77, text-fig. 4, pl. 1, fig. 2. 2011b Parabolbinella coeni Casier ; Casier in Casier et al.: pl. 1, fig 2. 2013 Parabolbinella coeni Casier ; Maillet: 37, pl. III, fig. 4.

2013b Parabolbinella coeni Casier ; Maillet et al.: figs. 7M–N.

2013 Parabolbinella coeni Casier ; Casier in Casier & Préat: 487, pl. II, fig. 4.

Material. 2 specimens (1 C, 1 V).

Diagnosis. Casier in Casier et al. (2011a, p. 77).

Description. Large preplete, bilobate and equivalve carapace. Hmax at 2/5 anterior; Lmax at 1/3 dorsal; Wmax corresponding to the anterior lobe (L2). Straight hinge line and dorsal margin. Anterior cardinal angle of about 130°. Posterior cardinal angle of about 95° with a possible spine pointing upwards (not preserved). Anterior margin more rounded than the posterior one. Anterior part of the carapace higher than the posterior one. Ventral margin regularly convex. Well-rounded and large posterior lobe (L3), reaching the dorsal margin in lateral view. Smaller anterior lobe (L2), located more ventrally and slightly elliptic with a major axis perpendicular to the dorsal margin. Marked adductorial sulcus. Tecnomorphic carapaces with two adventral spines on each valve. Surface papillose.

Discussion. Our specimens show all the features of P. coeni , with a large and well rounded posterior lobe, a possible spine at the postero-dorsal angle and a papillose surface. Only tecnomorphic specimens have been collected, exhibiting two adventral robust spines, one antero-ventral and the other medio-ventral.

Occurrence. Lower to Middle Givetian (Hanonet, Trois-Fontaines, Terres d’Haurs, Mont d’Haurs, Névremont Fms, and Fromelennes Fm, Flohimont and Moulin Boreux Mbs), Ardenne (Flohimont, Cul d’Houille, Mont d’Haurs, Aisemont, Resteigne, Couvin, Hotton, Glageon and Aisne section); Middle Givetian (Candás Fm), Asturias (Peran-Perlora section); Givetian, Boulonnais; Middle Devonian, Ruhr.

Figures

FIGURE 4. Height / length diagram for Evlanella peranensis Maillet n. sp .. The trendline equation (y) is indicated.