Sthenorytis simoni, Harzhauser & Landau, 2025

Sthenorytis simoni sp. nov.

Figs 44C View FIGURE 44

Sthenorytis proglobosa Sacco, 1891 — Schneider et al. 2009: 74, figs 5d–e [non Sthenorytis proglobosa ( Sacco, 1891) ].

Type material. Holotype, BSPG 2007 View Materials X 40, SL: 31.5 mm, MD: 23.0 mm, Gurlan ( Germany), illustrated in Schneider et al. (2009: figs 5d–e), Fig. 44C View FIGURE 44 . Stored in Bayerische Staatssammlung für Paläontologie und Geologie, Munich ( Germany).

Type locality. Gurlan ( Germany), North Alpine Foreland Basin .

Type stratum. Upper Marine Molasse .

Age. Early Miocene, early Ottnangian (mid-Burdigalian).

Etymology. In honor of Simon Schneider (CASP, Cambridge), who reported this species for the first time.

Diagnosis. Very large, robust, very broad, stocky, gradate, weakly coronate shell with subcylindrical whorls and prominent, uniform, strongly rolled over lamellae separated by slightly wider interspaces and numerous prominent spiral threads.

Description. Shell very large, robust, very broad, stocky, gradate (apical angle ~65°), weakly coronate. Protoconch and early teleoconch whorls unknown. Teleoconch whorls broad, subcylindrical with broad subsutural shelf and angled shoulder, separated by deeply impressed suture. Sculpture of prominent, strongly raised, uniform, weakly prosocline, internally lamellose lamellae forming indistinct, short spines along shoulder. Crests of lamellae strongly rolled over. Interspaces between lamellae broader than lamellae, with numerous narrow, prominent spiral threads. Last whorl attaining about 60% of total height, slightly convex, basal angulation weak, relatively narrow base with crowded, nearly amalgamated lamellae. Fasciole short, broad with prominent growth lines. Aperture subcircular, Columella concave. Columellar and parietal callus form continuous narrow rim detached from base. Peristome strongly thickened, duplex. Umbilicus reduced to narrow chink.

Discussion. This species was erroneously identified by Schneider et al. (2009) as Sthenorytis proglobosa ( Sacco, 1891) , originally described from the Burdigalian and Langhian of the Colli Torinesi ( Italy). The two are indeed similar but Sthenorytis simoni sp. nov. differs from the Italian species in its subcylindrical whorls and broad subsutural shelf. In addition, S. proglobosa lacks a basal angulation ( Sacco 1891: pl. 1, figs 62–67; Ferrero-Mortara et al. 1984: pl. 5, figs 1a–b). Sthenorytis trochiformis ( Brocchi, 1814) , from the Pliocene of the Mediterranean Sea, differs in its convex whorls, large, globose last whorl and lamellose varices (see Manganelli et al. 2011: figs 2–5).

Paleoenvironment. Agitated rocky shore and coastal environments ( Schneider et al. 2009).

Distribution in Central Paratethys. Ottnangian (Early Miocene): North Alpine Foreland Basin: Gurlan ( Germany) ( Schneider et al. 2009).