Cylindriscala amandae ( Boettger, 1906 )

Cylindriscala amandae ( Boettger, 1906)

Figs 20E View FIGURE 20 , 21C View FIGURE 21

* Pliciscala (Funiscala) Amandae n. sp. — Boettger 1906: 96.

Funiscala Amandae Boettger— Cossmann 1912: 195 View in CoL , pl. 5, fig. 24.

Opalia (Funiscala) amandae (Boettger) — Zilch 1934: 229, pl. 10, fig. 73.

Pliciscala (Funiscala) amandae Boettger— Korobkov 1955 : pl. 16, fig. 3.

Type material. Holotype, SMF 380174 About SMF _12-1455a ( XII 1455 a), SL: 7.7 mm, MD: 2.5 mm, CoŞteiu de Sus ( Romania), specimen illustrated in Zilch (1934: pl. 10, fig. 73), Figs 20E View FIGURE 20 , 21C View FIGURE 21 .

Revised description. Shell small, slender, turreted (apical angle ~18°). Protoconch unknown. Teleoconch of at least eight whorls. Whorl profile strongly convex with weakly concave subsutural ramp, periphery at rounded shoulder placed distinctly above mid-whorl, convex below. Suture deeply impressed, weakly undulating. Sculpture of widely spaced, prominent, relatively narrow, convex, orthocline to weakly prosocline axial ribs, not aligned axially (16: 11: 10). Two prominent varices on last whorl. Axial ribs only slightly weakening over subsutural ramp. Interspaces wide, glossy, bearing three weak spiral cords, overrunning and slightly swollen over axial ribs. Last whorl attaining ~33% of total height, basal angulation without continuous peribasal cord but delimited by row of blunt nodes formed by axial ribs; ribs very weak over slightly concave basal disc. Aperture ovate, columella weakly concave. Outer lip thickened by terminal varix. Columellar and parietal callus forming continuous, narrow rim, detached from base. Peristome duplex. Umbilicus reduced to narrow chink.

Discussion. Cylindriscala bellissima sp. nov. is very similar in outline but has broader axial ribs and lacks the weak spiral cords. A specimen from the Hemmoorian of Winterswijk-Miste ( the Netherlands) described as Turriscala (Rugatiscala) sp. by Janssen (1984: 175, pl. 50, figs 14a–b) is highly reminiscent of Cylindriscala amandae ( Boettger, 1906) and differs mainly in its more numerous axial ribs. Funiscala ? miopusilla ( Kautsky, 1925), from the Middle Miocene of the North Sea, has closer-set axial ribs and broader whorls with a slightly less incised suture (see Kautsky 1925: pl. 7, fig. 2).

Paleoenvironment. Unknown.

Distribution in Central Paratethys. Badenian (Middle Miocene): Făget Basin: CoŞteiu de Sus ( Romania) ( Zilch 1934).