Craspedochiton fontlevensis, Dell'Angelo, Lesport, Cluzaud & Sosso, 2020

Craspedochiton fontlevensis View in CoL Dell’Angelo, Lesport, Cluzaud & Sosso, 2020

Fig. 144 View FIGURE 144

Craspedochiton fontlevensis View in CoL Dell’Angelo, Lesport, Cluzaud & Sosso, 2020b, p. 46, fig. 30.

Type material. Holotype: MHNBx 2020.4.1, tail valve, width 2.8 mm, Figs 144A–D View FIGURE 144 .

Type locality. Gamachot ( France) .

Type stage. Miocene (Early Burdigalian).

Material examined. Type material.

Description. Head and indeterminate valves unknown. Tail valve elliptical (WT/LT = 1.73), anterior margin straight, jugal area triangular, very large, mucro posterior, poorly developed, antemucronal slope slightly convex, postmucronal slope weakly concave.

Tegmentum covered with small granules of irregular shape, coalescing to form irregular striae near side margins.

Articulamentum thick, apophyses trapezoidal, widely separated by a large sinus, teeth broad, higly irregular, ten deep slits.

Remarks. Craspedochiton fontlevensis Dell’Angelo, Lesport, Cluzaud & Sosso, 2020, described upon a single tail valve, is only known from the lower Miocene of Noaillan ( Dell’Angelo et al. 2020b). The single valve available is not well preserved, but the characters of the shell are so distinctive to warrant a specific recognition. Fig. 144B View FIGURE 144 show the valve always in dorsal view but more inclined, in order to better highlight some characteristics of the mucro.

Comparisons. See Tab. 23 for a comparison with the Craspedochiton spp . considered in the present study.

Distribution. Lower Miocene: northeastern Atlantic (Burdigalian): Aquitaine Basin, France: Gamachot ( Dell’Angelo et al. 2020b).