Adiscoacrilla walaszczyki, 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 : 27-28

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-FFFF-FFFF-FF3F-FA07FD429549
treatment provided by	Plazi
scientific name	Adiscoacrilla walaszczyki
status	sp. nov.

Treatment

Adiscoacrilla walaszczyki sp. nov.

Figs 4F View FIGURE 4 , 7L View FIGURE 7 , 9F View FIGURE 9 1 –F View FIGURE 1 2 View FIGURE 2

Acrilla (Acrilla) orientalis (Friedberg) — Bałuk 1975: 176 (pars), pl. 21, figs 1–2 [non ‘Epitonium’ orientale ( Friedberg, 1928)] [not fig. 3 = Hyaloscala sp. ].

Type material. Holotype, NHMW 2024 View Materials /0278/0002, SL: 3.9 mm, MD: 1.9 mm, Bad Vöslau ( Austria), Figs 4F View FIGURE 4 , 7L View FIGURE 7 , 9F View FIGURE 9 1 –F View FIGURE 1 2 View FIGURE 2 .

Type locality. Bad Vöslau ( Austria), Vienna Basin .

Type stratum. Baden Formation.

Age. Middle Miocene, middle Badenian (Langhian).

Etymology. In honor of Ireneusz Walaszczyk (Faculty of Geology, University of Warsaw, Poland) for his help searching for type material published by Wacław Bałuk.

Diagnosis. Very small, moderately broad conical, turreted shell with strongly convex whorls, weak shoulder placed high, bearing close-set, erect lamellae, prominent spiral threads in interspaces, strong and sharp basal angulation.

Description. Very small, thin-shelled, moderately broad, conical (apical angle 35°). Protoconch conical, of three smooth, slightly convex whorls. Teleoconch of at least six strongly convex whorls with narrow, shallow, weakly convex subsutural ramp, delimited by high-placed faint shoulder angulation, with periphery placed just above mid-whorl. Suture deeply impressed, linear. Sculpture of moderately raised, closely set, weakly prosocline, erect lamellae (18: 22: 24), not aligned axially. Crests of lamellae only weakly rolled. Interspaces with numerous, delicate spiral threads. Last preserved whorl with sharp basal angulation delimited by narrow peribasal cord. Basal disk flat with prominent axial ribs, corresponding to lamellae. No umbilicus.

Discussion. Adiscoacrilla walaszczyki sp. nov. differs from the otherwise similar Adiscoacrilla laticostata ( Bałuk, 1975) in its protoconch of only three instead of four whorls, the more convex whorls and it lacks a coronate shoulder. Adiscoacrilla herthae ( Boettger, 1906) is slenderer and has fewer lamellae. Adiscoacrilla villalvernensis ( Sacco, 1891) , from the Pliocene of the Mediterranean Sea, differs from A. walaszczyki in its wider spaced lamellae (see Landau et al. 2006: pl. 13, figs 9–10, pl. 14, fig 1). Adiscoacrilla coppii (de Boury, 1890) , from the Mediterraean Pliocene, is stockier with a wider last whorl (see Chirli 2009: pl. 18, figs 8–15). This species was confused by Bałuk (1975) also with Adiscoacrilla? orientalis ( Friedberg, 1928) , which differs in its much more prominent and wider spaced lamellae.

Paleoenvironment. Occurrences in the Baden Formation of the Vienna Basin suggest middle to outer neritic settings in up to 250 m water depth ( Kranner et al. 2021).

Distribution in Central Paratethys. Badenian (Middle Miocene): Korytnica Basin: Korytnica ( Poland) ( Bałuk 1975); Vienna Basin: Bad Vöslau ( Austria) (hoc opus).