Nodiscala macilenta

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 : 101

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-FF81-FF80-FF3F-FE9FFDE493A5
treatment provided by	Plazi
scientific name	Nodiscala macilenta
status

Treatment

Nodiscala macilenta (De Boury in Cossmann, 1912)

Figs 35B View FIGURE 35 , 38A–D View FIGURE 38

* Pliciscala macilenta de Boury sp. nov. —De Boury in Cossmann 1912: 83, pl. 6, fig. 25.

Opalia (Pliciscala) macilenta (De Boury) — Zilch 1934: 227, pl. 10, fig. 67.

Scala cf. orientalis Friedberg— Atanacković 1969: 200 View in CoL , pl. 9, figs 13–13a [non Adiscoacrilla? orientalis ( Friedberg, 1928) ].

Type material. Holotype, SMF 380181 About SMF _12-1460a ( XII 1460 a), SL: 2.5 mm, MD: 1.0 mm, CoŞteiu de Sus ( Romania), specimen illustrated in Zilch (1934: pl. 10, fig. 67), Fig. 38A View FIGURE 38 .

Illustrated material. NHMW 1997z0178/0970, SL: 5.0 mm, MD: 2.1 mm, Bad Vöslau ( Austria), Figs 38D View FIGURE 38 1 –D View FIGURE 1 2 View FIGURE 2 . NHMW 1864/0001/0102a, SL: 3.8 mm, MD: 1.6 mm, Baden ( Austria), Figs 35B View FIGURE 35 , 38B View FIGURE 38 1 –B View FIGURE 1 2 View FIGURE 2 . NHMW 1864/0001/0102b, SL: 2.8 mm, MD: 1.3 mm, Baden ( Austria), Figs 38C View FIGURE 38 1 –C View FIGURE 1 2 View FIGURE 2 .

Revised description. Shell small, moderately slender (apical angle ~21–25°). Protoconch incomplete but multispiral, high conical, of smooth, weakly convex whorls. Teleoconch of six strongly convex whorls. Whorl profile with moderately steep, weakly concave subsutural ramp, angled periphery placed just below or above mid-whorl. Suture distinctly impressed, weakly undulating. Sculpture of moderately close-set, prominent, convex, orthocline to weakly prosocline low axial ribs, not aligned axially (8: 13: 13). Axial ribs weakening over subsutural ramp, most prominent at periphery. One more prominent, prosocline varix per whorl may appear. Spiral sculpture of numerous spiral cords separated by slightly narrower, deeply punctate interspaces. Last whorl attaining ~42% of total height, moderate basal angulation with subobsolete peribasal cord, base weakly convex to nearly flat with prominent spiral cords. Aperture ovate, columella weakly concave. Outer lip strongly thickened by terminal varix. Columellar and parietal callus forming continuous, narrow rim, detached from base. Peristome duplex. Umbilicus reduced to narrow chink.

Discussion. Nodiscala macilenta (De Boury in Cossmann, 1912) differs from Nodiscala scacchii (Hörnes, 1856) in its broader conical outline and broader, more prominent axial ribs that lack the vague nodes developed at the shoulder in N. scacchii . The extant Atlanto-Mediterranean Nodiscala coronata (Philippi & Scacchi in Philippi, 1840) [= Nodiscala hellenica ( Forbes, 1844) ] may develop shells with angled whorls, which are reminiscent of N. macilenta but N. coronata is slenderer, with less convex whorls, the suture is more superficial and strongly crenulate (see Landau et al. 2006: pl. 15, figs 2–3).

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, Bad Vöslau ( Austria) (hoc opus); Southern Pannonian Basin: Miljevići (Bosna and Herzegovina) ( Atanacković 1969); Făget Basin: CoŞteiu de Sus ( Romania) ( Zilch 1934).