Adiscoacrilla anticoppii, Harzhauser & Landau, 2025

Adiscoacrilla anticoppii sp. nov.

Figs 7J View FIGURE 7 , 9D View FIGURE 9 1 –D View FIGURE 1 2 View FIGURE 2

Type material. Holotype, NHMW 2024 View Materials /0279/0004, SL: 18.3 mm, MD: 7.3 mm, Grund ( Austria), Figs 7J View FIGURE 7 , 9D View FIGURE 9 1 – D View FIGURE 1 2 View FIGURE 2 .

Type locality. Grund ( Austria), North Alpine-Carpathian Foreland Basin .

Type stratum. Grund Formation.

Age. Middle Miocene, early Badenian (Langhian).

Etymology. Anti (Ancient Greek for ‘against’) and coppii , referring to Adiscoacrilla coppii (de Boury, 1890) .

Diagnosis. Medium-sized, moderately slender, turreted shell with strongly convex whorls, delicate, widely spaced, weakly raised lamellae with prominent spiral threads in interspaces, weak basal angulation; lamellae distinctly increase in strength during ontogeny.

Description. Shell medium-sized, moderately slender, turreted (apical angle ~22°). Protoconch and early teleoconch whorls unknown. Teleoconch of strongly convex whorls with indistinct subsutural ramp, periphery placed just below mid-whorl. Suture deeply impressed, linear. Sculpture of numerous, delicate, widely spaced, weakly raised, weakly prosocline lamellae, not aligned axially (?: ~20: ~25), separated by much wider interspaces. Some lamellae slightly more prominent, occasionally forming narrow varices. Lamellae distinctly increase in strength during ontogeny. Crests of lamellae straight. Interspaces with numerous prominent spiral threads, occasionally with intercalated secondary spirals. Last whorl convex, attaining about 40% of total height, basal angulation weak without peribasal cord, base weakly convex with delicate spiral threads, lamellae slightly rolled over. Short, broad fasciole with prominent growth lines.Aperture elongate ovate, columella weakly concave. Columellar callus forming narrow rim slightly detached from fasciole, no parietal callus. Umbilicus reduced to narrow chink. Peristome not preserved.

Discussion. This species is reminiscent of Adiscoacrilla herthae ( Boettger, 1906) but is larger, has more numerous lamellae and lacks a peribasal cord. The whorls are regularly convex, whereas in A. herthae they are distinctly shouldered. Adiscoacrilla coppii (de Boury, 1890) , from the Pliocene of Italy, is similar in general shape but differs in its wider apicalangle, more elevated lamellae and marked basal angulation (see de Boury 1890: pl. 4, fig. 1; Landau et al. 2006: pl. 13, figs 5–6; Chirli 2009: pl. 18, figs 8–15).

Paleoenvironment. At the locality Grund channels formed in middle to outer neritic environments and were filled with allochthonous assemblages uniting coastal-mudflat faunas with inner neritic ones (Zuschin et al. 2005; Roetzel 2009). The preservation suggests that the shell might have belonged to the middle and outer neritic assemblages.

Distribution in Central Paratethys. Badenian (Middle Miocene): North Alpine-Carpathian Foredeep: Grund ( Austria).