Lepidopleurus gallicus, Dell'Angelo, Landau, Van Dingenen & Ceulemans, 2018

Lepidopleurus gallicus View in CoL Dell’Angelo, Landau, Van Dingenen & Ceulemans, 2018

Fig. 4 View FIGURE 4

Lepidopleurus gallicus View in CoL Dell’Angelo, Landau, Van Dingenen & Ceulemans, 2018b, p. 11, fig. 4; Dell’Angelo et al. 2020b, p. 52, tab. 9.

Type material. Holotype: MNHN.F.A67060, tail valve, width 14 mm ( Figs 4A–D View FIGURE 4 ) . Paratype: MNHN.F.A67061, tail valve, width 10 mm .

Type locality. Saint-Clément-de-la-Place ( France) .

Type stage. Miocene (Tortonian).

Material examined. Upper Miocene: France: Saint-Clément-de-la-Place: type material .

Description. Valves solid. Head and intermediate valves unknown. Tail valve semicircular, elevated, width slightly less than twice length (W/L = 1.77), anterior margin slightly convex, mucro pronounced, in anterior position, antemucronal slope convex, postmucronal slope slightly concave just under mucro, interrupted by profile of concentric terraced ribs.

Tegmentum fine, more regular. PMA sculptured with radial chains of granules, just over 80 near mucro, tending to branch and multiply towards posterior margin, intersected by numerous concentric ribs. AA sculptured with ca. 110 regular longitudinal chains of roundish granules, united with each other.

Articulamentum without insertion laminae, apophyses large.

Remarks. The species is known only from the two tail valves from Saint-Clément-de-la-Place ( France) described by Dell’Angelo et al. (2018b).

Comparisons. These valves differ from tail valves of Lepidopleurus pseudobenoisti Dell’Angelo, Landau, Van Dingenen & Ceulemans, 2018 in the regularity (no trace of branching and anastomosing) and the greater number (110 vs. 60) of the longitudinal chains of granules in AMA, the less concave postmucronal slope, and conspicuously finer sculpture. See Tab. 1 for a comparison with the Lepidopleurus spp. considered in the present study.

Distribution. Upper Miocene: northeastern Atlantic (Tortonian): Anjou, France: Saint-Clément-de-la-Place ( Dell’Angelo et al. 2018b).