Bucardium grateloupianum La Perna, 2016
- GBIF Backbone Taxonomy
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- La Perna, R. Bucardium grateloupianum n. sp. from the Lower Miocene of Aquitaine with taxonomic comments on some fossil species from Europe (Bivalvia, Cardiidae). Zootaxa. 4178 (4): 568-582 (2016).
- Bucardium grateloupianum
Etymology. The species is named after the French naturalist Jean-Pierre Sylvestre de Grateloup (1782 – 1861), who was the first to recognise and name this species in schedis. Comparison. The only species which Bucardium grateloupianum n. sp. surely deserves to be compared to is B. ringens (Fig. 1). In B. grateloupianum n. sp., the antero-dorsal margin is long, almost straight and only slightly sloping whereas it is shorter and distinctly sloping in B. ringens. The antero-dorsal area with fine radial ribs (Fig. 2 J) is much better defined in the new species, and the posterior digitations are coarser and less numerous with the dorsal one pointing upwards and extending above the umbo, in the large valves at least (Fig. 2 A – C, G, H). The radial sculpture follows the same pattern as in B. ringens, but in the new species the medial ribs are mainly symmetrically convex and only becoming asymmetrical and then ridged near the posterior margin. The crescentshaped growth striae on the posterior ribs are well distinct in B. ringens but ill-defined in the new species (Fig. 2 C). Bucardium grateloupianum n. sp. is slightly elongate antero-posteriorly, particular at larger size, instead of being almost equidimensional as B. ringens, and with a larger maximum size (slightly exceeding 60 mm in length). Some differences can be also seen in the hinge, which is straighter in the new species, with the posterior lateral tooth in the right valve further away from the cardinal teeth than in B. ringens (Fig. 2 F, I). Crenulation on the lunular flap is generally coarser and better developed in the new species (Fig. 2 K), but this character seems rather variable. FIGURE 2. Bucardium grateloupianum n. sp. A – C. Holotype, St-Paul-lès-Dax, RV (MNHN Sciences de la Terre A 13845, d'Orbigny coll. 10986), photo J. J. ter Poorten, with permission. D – F, K. Paratype 1, Mérignac, LF (MZB 60206). G – J. Paratype 2, Mérignac, RV (MZB 60207). L. Mérignac, RV (ter Poorten coll. TP 1310), photo J. J. ter Poorten, with permission. FIGURE 3. Bucardium grateloupianum n. sp. A. Salles, RV (NHMW 1851. XIX. 56). B. Saucats, RV (NHMW no registration number). C. Mérignac, LV (NHMW 1850. XXV. 99). D. Salles, LV (NHMW no registration number). E, Léognan, RV (NHMW 1860. XXIX. 58). F. Léognan, LV (NHMW 1860. XXIX. 58). FIGURE 4. Cardium indicum Lamarck, 1819. A – C. Gravina in Puglia, Early Pleistocene, LV, sculpture details (MPUB). In B. ringens, right and left digitations touch each other at least in part (Fig. 1 E) whereas the posterior gape in B. grateloupianum n. sp. seems wider, with digitations not touching each other. Variations mainly regard the length and number of posterior digitations: they are typically well developed, up to six, but specimens with few, short digitations (3 – 4) (Fig. 3 A – C) and even almost mutic specimens are known (Fig. 3 D).
Type locality. Saint-Paul-lès-Dax, Landes, SW France. The holotype is from a lot in the d'Orbigny coll. (MNHN) from Saint-Paul-lès-Dax, labelled as " Cardium burdigalinum Lamarck, Falunien B ". The outcrops in the area of Saint-Paul-lès-Dax (SE of Bordeaux) are shallow-water, coarse-grained deposits (" falun ") of Aquitanian to Burdigalian age (Poignant 1966). The paratypes are from Mérignac, a well known Burdigalian locality in the area of Bordeaux (Folliot 1989; Cahuzac & Janssen 2010). Other material. Mérignac, 4 vs (La Perna coll.); Mérignac, 1 v (ter Poorten coll. 1310); Mérignac, 2 vs (NHMW 1850. XXV. 99); Léognan, 1 v (NHMW 1851. XVII. 1324); Salles, 2 vs (NHMW 1851. XXIX. 56); Léognan, 2 vs (NHMW 1860. XXIX. 58); Saucats, 2 vs (NHMW no registration number).
Type material. Holotype, RV, Burdigalian of St-Paul-lès-Dax (MNHN Sciences de la Terre A 13845, d'Orbigny coll. 10986); Paratype 1, RV, Burdigalian of Mérignac (MZB 60206); Paratype 2, LV, Mérignac (MZB 60207).
- La Perna, R. (2016). <i>Bucardium grateloupianum</i> n. sp. from the Lower Miocene of Aquitaine with taxonomic comments on some fossil species from Europe (Bivalvia, Cardiidae). <em>Zootaxa.</em> 4178 (4): 568-582.
- Lesport J.-F., Lozouet P., Pacaud J.-M., Rocher P., Renard P. & Favia R. (2019). Les Bivalvia de l'Aquitanien (Miocène inférieur) de Saucats "Lariey" (Gironde, Sud-Ouest France). 2.- Heterodonta (Première partie). <em>Cossmanniana.</em> 21: 3-99.