Hyaloscala occidentalis, 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 : 84

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-FFB6-FFB7-FF3F-FCFBFA249101
treatment provided by	Plazi
scientific name	Hyaloscala occidentalis
status	sp. nov.

Treatment

Hyaloscala occidentalis sp. nov.

Figs 28I View FIGURE 28 , 32A View FIGURE 32

Type material. Holotype, NHMW 2007 View Materials /0086/0165c, SL: 8.6 mm, MD: 3.9 mm, Baden ( Austria), Figs 28I View FIGURE 28 , 32A View FIGURE 32 1 – A View FIGURE 1 2 View FIGURE 2 .

Type locality. Baden ( Austria), Vienna Basin .

Type stratum. Baden Formation.

Age. Middle Miocene, middle Badenian (Langhian).

Etymology. Occidentalis (Latin for western).

Diagnosis. Small, moderately slender conical shell with strongly convex, slightly angled whorls, deeply impressed suture and somewhat inflated last whorl, with numerous delicate, slightly raised, sigmoidal lamellae with smooth interspaces, no peribasal cord.

Description. Shell small, moderately slender conical (apical angle ~26°). Protoconch and first teleoconch whorls unknown. Early teleoconch whorls convex, with moderately steep, weakly concave subsutural ramp, slightly angled below, periphery placed just below abapical suture. Later whorls strongly increasing in width with more prominent angulation mid-whorl. Suture deeply impressed, linear. Sculpture of delicate, slightly raised, close-set, slightly sigmoidal lamellae, not aligned axially (~25: ~38: ~34), occasionally amalgamating into weak varices, tips of lamellae slightly bent in apertural direction, faintly alate, touching preceding whorl. Crests of lamellae slightly rolled over. Interspaces smooth, increasing slightly in width on later whorls. Last whorl attaining ~42% of total height, weak basal angulation without peribasal cord, lamellae persisting over weakly convex base, strongly rolled over. Aperture ovate, columella weakly convex. Outer lip not thickened. Columellar callus forming narrow, attached rim. Parietal callus delicate. Peristome simple. No umbilicus.

Discussion. This species could be confused with Subuliscala breitenbergeri sp. nov., which is similar in shape and axial sculpture, but differs in the presence of spiral cords in the latter. The extant Hyaloscala amathusium ( Melvill & Standen, 1903) , from the Indian Ocean, has a broader conical shell with fewer lamellae (see Weil et al. 1999: fig. 202). The Atlanto-Mediterranean Hyaloscala clathratulum ( Kanmacher, 1798) has more prominent lamellae and less convex whorls without angulation.

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): Vienna Basin: Baden ( Austria) (hoc opus).