Tectonatica distincta ( Eichwald, 1829 ), 2025

Tectonatica distincta ( Eichwald, 1829) nov. comb.

Figs 24A–B View FIGURE 24 , 25 View FIGURE 25

* N [ atica]. distincta n.— Eichwald 1829: 299, pl. 5, fig. 16.

N [ atica]. distincta m.— Eichwald 1830: 218.

Nat [ ica]. distincta m.— Eichwald 1851: 124.

Natic [ ia]. distincta m.— Eichwald 1853: 256.

Tectonatica pseudoprietoi View in CoL sp. nov. — Pedriali et al. 2019: 170, text-fig. 26. Type material. Neotype (designated herein): SPSU 3/465, SL: 12.3 mm, MD: 11.6 mm, Bilozirka, Ukraine, Middle Miocene, late Badenian, Figs 24A View FIGURE 24 1 –A View FIGURE 1 5 View FIGURE 5 . The specimen illustrated in Eichwald (1829: pl. 5, fig. 16) from Staro-Poczaiow ( Ukraine) seems to be lost. Therefore, we designate a neotype.

Illustrated material. MPUM 11740 View Materials , Varivtsi ( Ukraine) , SL: 8.8 mm, MD: 8.1 mm, holotype of Tectonatica pseudoprietoi Pedriali, Sosso & Dell’Angelo, illustrated in Pedriali et al. (2019: figs 26.1a–c), Figs 24B View FIGURE 24 1 –B View FIGURE 1 3 View FIGURE 3 .

Revised description. Small, depressed ovate shell of about four teleoconch whorls; ( SL /MD = ~1.1). Protoconch close to planispiral with flattened whorls, no clear separation from teleoconch. Spire low conical, with weakly convex whorls; apical angle 110–130°. Suture linear, adpressed. Teleoconch whorls with broad, weakly concave subsutural ramp; shoulder weak, rounded. Last whorl high, weakly expanding, attaining 97% of total height; strongly convex below shoulder, regularly convex at periphery and base. Periphery far below mid-whorl (~35%). Growth lines delicate on subsutural ramp, prosocline and insignificant at periphery. Aperture moderately wide, D-shaped. Position of adapical tip of aperture high (~85%), slightly above mid-whorl, far below shoulder. Aperture attaining ~84% of total height. Columellar lip slightly reinforced, basal and outer lips moderately thin. Columellar angle ~18– 20°. Umbilicus moderately wide (~18%), deep, semicircular. Shell light brown, with whitish to brown collabral lines. Parietal callus moderately short (~40–42%), weakly thickened, with slight adapical swelling, not expanding over base, with straight margin. Anterior lobe of parietal callus thin, fused with umbilical callus. Umbilical callus prominent, tongue-like semicircular delimited by deep umbilical channel. Funicle behind umbilical callus not visible; adapical and abapical sulci deeply concave. Basal fasciole solid, broad, rounded.

Paratethyan synonyms. Tectonatica pseudoprietoi Pedriali, Sosso & Dell’Angelo, 2019 , from the late Badenian of Ukraine, is a subjective junior synonym. When describing this species, Pedriali et al. (2019) did not mention Natica distincta Eichwald, 1829 . In our opinion, Tectonatica pseudoprietoi cannot be separated from Natica distincta and therefore, we treat it as subjective junior synonym.

Discussion. This species was neglected so far in the literature probably due to the very poor illustration in Eichwald (1829). Interestingly, Eichwald (1852) did not re-illustrate it in his atlas. Only a single specimen was found labeled as Natica distincta in Eichwald’s collection in Paleontological Museum of Saint Petersburg State University, Saint Petersburg. It comes from Bialozirka ( Fig. 25 View FIGURE 25 ), which was not listed by Eichwald as locality of this species. Therefore, it cannot be designated as lectotype of Natica distincta .

Paleoenvironment. Probably shallow marine, inner neritic.

Distribution in Central Paratethys. Late Badenian (Middle Miocene): Polish-Ukrainian Fore-Carpathian Basin: Dibrova, Varivtsi (Khmel’nytskyi Region), Bilozirka, Mala Bilka, Staro-Poczaiow, Zalistsi ( Ternopil Region, Ukraine) (Eichwald 1929; Pedriali et al. 2019; hoc opus).