Subuliscala sp.

Subuliscala sp.

Figs 46A View FIGURE 46 1 –A View FIGURE 1 2 View FIGURE 2

Illustrated material. NHMW 2010/0004/0532a, SL: 7.1 mm, MD: 3.1 mm, Bad Vöslau ( Austria), Figs 46A View FIGURE 46 1 –A View FIGURE 1 2 View FIGURE 2 .

Description. Shell small, moderately broad conical (apical angle ~28°). Protoconch and first teleoconch whorls unknown. Teleoconch whorls convex, with narrow, moderately steep, weakly concave subsutural ramp and faint shoulder. Periphery convex, placed just above abapical suture. Suture moderately impressed, linear. Sculpture of numerous delicate, weakly raised, close-set, slightly prosocline lamellae, not aligned axially (~20: ~38: ~40). Spiral sculpture of numerous delicate spiral threads. Last whorl not preserved.

Discussion. This species is most similar to a Subuliscala species described by Landau et al. (2006: pl. 13, figs 7–8) from the Pliocene of Spain as ‘ Acrilla stefanii (De Boury, 1890) ’. That species differs from Subuliscala sp. in its larger size (SL: 21.9 mm) and has wider-spaced lamellae at same growth stage. The Pliocene species lacks a sharp basal angulation seen in Adiscoacrilla stefanii and has more delicate lamellae (see De Boury, p. 202, pl. 4, fig. 9). Adiscoacrilla stefanii was placed in Acrilla by Sacco (1891) and Landau et al. (2006) but Acrilla lacks prominent spiral sculpture and develops axial ribs rather than lamellae (based on its type species Acrilla acuminata (G.B. Sowerby II, 1844) and the second extant Acrilla species Acrilla minor (G.B. Sowerby II, 1873) .

Subuliscala sp. differs from Subuliscala breitenbergeri sp. nov. in its stockier shape and the more close-set 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): Vienna Basin: Bad Vöslau ( Austria) (hoc opus).

Genus Turriscala de Boury, 1890

Type species. Turbo torulosus Brocchi, 1814 ; original designation by de Boury (1890: 187). Miocene, Italy.

Diagnosis. “ Very thick , solid, opaline shell. Size fairly large; shape turriculate, conical; spire long, subulate; whorls slightly convex, slightly excavated above the suture, which is narrowly grooved and bordered above by a subobsolete, finely undulating cord; sculpture composed of thick ribs, narrower than their intervals, partly varicose, not extending to the sutural cord; spiral cords more or less regular; in addition, the surface is very finely sculptured by small, excessively tight lines of growth, which can only be seen on very well preserved individuals. Last whorl approximately equal to a quarter of the total height, depressed at the base which is imperforate and circumscribed by a double peripheral cord; […] Relatively small, circular aperture, with a very thick peristome, split around its entire circumference; the inner layer remains fairly loose throughout and spreads out especially anteriorly; the outer layer borders the aperture with a thick varicose vein, which lies in a plane oblique at 10° or 15° to the vertical axis.” (translated from Cossmann 1912: 79–80).