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

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco, 2025, The Cenozoic European Polyplacophora (Mollusca), Zootaxa 5704 (1), pp. 1-377 : 281-282

publication ID	https://doi.org/10.11646/zootaxa.5704.1.1
publication LSID	lsid:zoobank.org:pub:747DFE8B-156A-493A-8817-5F861C4D6319
persistent identifier	https://treatment.plazi.org/id/03FEF726-FEF7-4F09-0FAD-FBEB6B5991FF
treatment provided by	Plazi
scientific name	Craspedochiton lozoueti
status

Treatment

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

Fig. 145 View FIGURE 145

Craspedochiton lozoueti View in CoL Dell’Angelo, Lesport, Cluzaud & Sosso, 2020b, p. 45, fig. 29.

Type material. Holotype MHNBx 2020.2.8, tail valve, width 3 mm, Figs 145F–H View FIGURE 145 . Paratypes: MHNBx 2020.1.6, head valve, width 4 mm, Figs 145A–B View FIGURE 145 ; MHNBx 2020.1.5, intermediate valve, width 4.5 mm, Figs 145C–E View FIGURE 145 .

Type locality. Gaas , Lagouarde ( France) .

Type stage. Oligocene (Rupelian).

Material examined. Lower Oligocene (Rupelian): Gaas: type material plus 17 valves ( AC, DA, JCV). Maximum width of the valves: 4 / 4.5 / 3.1 mm .

Description. Head valve semicircular, with five well evident radial ribs, slope almost straight. Intermediate valve trapezoidal (WT/LT = 1.56–1.78), semicarinate in anterior profile, elevated (H/W = 0.44–0.57), anterior margin almost straight in jugum, side margins rounded, posterior margin slightly concave at both sides of prominent apex, jugal area large, triangular, lateral areas not separated from central area. Tail valve broadly circular, mucro subcentral, not elevated and poorly developed, antemucronal and postmucronal slopes almost straight.

Tegmentum covered with large, elevated granules of irregular shape, except on JA, furrowed by strong longitudinal cords (poorly delimited in JA abraded of tail valve), shape of granules highly variable, from single granules, regularly ellipsoidal, to coalescent granules, top of granules convex.

Articulamentum with trapezoidal and widely separated apophyses, expanded in tail valves, insertion lamina reduced to narrow band in HV, large posterior callus in tail valves, slit formula 5 / 1 / 7, teeth broad, roughed dorsally, more irregular in tail valves, slits deep, dorsally slightly elevated, forming channel.

Remarks. The fossil record of Craspedochiton lozoueti Dell’Angelo, Lesport, Cluzaud & Sosso, 2020 is limited to the lower Oligocene of Gaas ( Dell’Angelo et al. 2020b). This is the oldest species of Craspedochiton known from the Cenozoic of Europe.

Comparisons. The sculpture of the jugal area of Craspedochiton lozoueti (furrowed by strong longitudinal cords is different from that of the other species of Craspedochiton studied here, granular (albeit with less evident granules in some cases) or smooth.

Distribution. Lower Oligocene: northeastern Atlantic (Rupelian): Aquitaine Basin, France: Gaas ( Dell’Angelo et al. 2020b).