Anguloacrilla schwarzhansi, Harzhauser & Landau, 2025

Harzhauser, Mathias & Landau, Bernard M., 2025, The Epitoniidae (Gastropoda, Epitonioidea) of the Miocene Central Paratethys Sea-an overwhelming diversity, Zootaxa 5630 (1), pp. 1-142 : 35-36

publication ID	https://doi.org/10.11646/zootaxa.5630.1.1
publication LSID	lsid:zoobank.org:pub:89462472-D932-4255-880F-C6EF15220A31
persistent identifier	https://treatment.plazi.org/id/03D787A4-FFC7-FFC7-FF3F-F9F4FC0F959D
treatment provided by	Plazi
scientific name	Anguloacrilla schwarzhansi
status	sp. nov.

Treatment

Anguloacrilla schwarzhansi sp. nov.

Figs 7C–D View FIGURE 7 , 12A–C View FIGURE 12

Type material. Holotype, NHMW 2024 View Materials /0279/0002, SL: 24.8 mm, MD: 13.8 mm, Grund ( Austria), Figs 7C View FIGURE 7 , 12B View FIGURE 12 1 – B View FIGURE 1 2 View FIGURE 2 . Paratypes, NHMW 1859 View Materials /0019/0109a, SL: 21.2 mm , MD: 10.3 mm, Porzteich ( Czech Republic), Figs 7D View FIGURE 7 , 12A View FIGURE 12 . NHMW 2024 View Materials /0279/0003, SL: 21.6 mm , MD: 14.4 mm, Grund ( Austria), Figs 12C View FIGURE 12 1 –C 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. In honor of Werner Schwarzhans (Hamburg, Germany), in recognition of his contributions on the knowledge of the Paratethyan fish fauna.

Diagnosis. Large, moderately slender, finely coronate shell with narrow, shallow subsutural ramp and angled shoulder, bearing numerous, close-set lamellae forming indistinct spines along shoulder, prominent, close-set spiral cords in axial interspaces, differing from congeners in its fewer lamellae.

Description. Shell large, moderately slender (apical angle ~25°), finely coronate. Protoconch unknown. Teleoconch of relatively low, moderately convex whorls with narrow, shallow subsutural ramp and angled shoulder. Periphery placed mid-whorl. Sculpture of numerous, moderately close-set, low, only weakly prosocline lamellae not aligned axially (~20: ~29/38: ~33/38), forming indistinct short spines along shoulder. Interspaces between lamellae with numerous fine spiral threads, separated by interspaces of about equal width. Secondary spiral cords may occasionally occur. Crests of lamellae erect and delicately granulose at intersections with spiral cords especially close to abapical suture. Last whorl with marked basal angulation, delimited by prominent peribasal cord, flat basal disc, lamellae weakening over base, numerous prominent spiral threads. Fasciole very short, broad, with prominent growth lines. Largely covered by columellar callus in some specimens. Aperture subcircular with parietal concavity. Columella concave. Outer lip not preserved. Columellar callus forming very broad rim, adherent to but well delimited from base, parietal callus delicate. Peristome not preserved. Abapical part of the outer lip ends in short spout. No umbilicus.

Discussion. Anguloacrilla schwarzhansi sp. nov. is morphologically close to Anguloacrilla kimakowiczi ( Boettger, 1896) but differs in its fewer lamellae, fewer spiral threads, and the more prominent peribasal cord. Moreover, A. kimakowiczi develops distinct secondary spiral cords. Another difference is the slightly wider and steeper subsutural ramp in A. schwarzhansi . Anguloacrilla lima sp. nov. is distinguished by its more numerous, closer set lamellae and the rounded shoulder.

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 shells belonged to the inner neritic assemblages.

Distribution in Central Paratethys. Badenian (Middle Miocene): North Alpine-Carpathian Foreland Basin: Grund ( Austria); Vienna Basin: Porzteich at Břeclav ( Czech Republic).