Fraudiziba rudolfi ( Bałuk, 1997 ) Harzhauser & Landau, 2021

Harzhauser, Mathias & Landau, Bernard, 2021, The Mitridae (Gastropoda: Neogastropoda) of the Miocene Paratethys Sea, Zootaxa 4983 (3), pp. 1-72 : 38

Fraudiziba rudolfi ( Bałuk, 1997) nov. comb.

Figs 9J 1 –J 2

Mitra goniophora Type — Hoernes & Auinger 1880: 78, pl. 9, figs 11a–b [non Bellardi, 1850].

* Mitraria (Mitraria) rudolfi nom. n. — Bałuk 1997: 33, pl. 8, fig. 5.

? Mitraria (Mitraria) goniophora ( Bellardi, 1850) — Atanacković 1985: 162, pl. 36, figs 9–10 [non Bellardi, 1850].

Type material. Holotype: NHMW 1861 /0001/0238, SL: 17.8 mm, MD: 7.4 mm, Pöls ( Austria), illustrated in Hoernes & Auinger (1880, pl. 9, figs 11a–b), figs 9J 1 –J 2.

Revised description. Shell small, broadly fusiform with impressed suture and slightly coeloconoid early teleoconch. Protoconch unknown. Teleoconch of at least eight whorls. Early teleoconch whorls high conical to nearly subcylindrical. Whorl profile changing by fifth teleoconch whorl to convex with periphery at abapical suture. Spiral sculpture on spire whorls consisting of seven flat spiral cords, separated by moderately narrow, shallow spiral grooves. Abapical spiral cord largely covered by subsequent whorl. Last whorl with faint, rounded shoulder, subcylindrical below shoulder, weakly constricted at base. Spiral cords widening and weakening on last whorl, subobsolete below shoulder. Broad, flat spiral cords on base and fasciole separated by prominent spiral grooves. Aperture moderately wide, posteriorly narrowly angulated. Columellar callus narrow, extending from adapical columellar fold to tip of siphonal canal. Columella with four oblique folds, weakening abapically. Outer lip thin. Siphonal canal moderately short, wide, straight, with shallow siphonal notch.

Shell measurements and ratios. SL: 17.8 mm, MD: 7.4 mm, AA: 53°, SL/ MD: 2.4, AL/AW: 4.6, AH/S: 2.8.

Discussion. This species is superficially similar to broad morphotypes of Fraudiziba mathiasi ( Bałuk, 1997) , but differs in its lower spire, convex instead of subcylindrical whorls, higher number of spiral cords, and the narrowly angulated aperture. Hoernes & Auinger (1880) considered this species to represent the ‘typical’ Mitra goniophora Bellardi, 1850 . However, the illustrations of the syntypes of Mitra goniophora in Bellardi (1850. pl. 1, fig. 20), Bellardi (1887a, pl. 4, fig. 8) and Ferrero-Mortara et al. (1981, pl. 48, figs 11a–b) show them to be less stocky, with more angulated whorls, and the base is more constricted. The specimen described by Atanacković (1985) from Bosnia and Herzegovina as Mitraria goniophora might represent F. rudolfi , but the preservation does not allow a clear identification.

Palaeoenvironment. Inner neritic environments.

Distribution in Central Paratethys. Badenian (middle Miocene): Korytnica Basin: Korytnica ( Poland) ( Bałuk 1997), Styrian Basin: Pöls ( Austria); all other localities mentioned by Hoernes & Auinger (1880) are based on misidentifications of other species.? Southern Pannonian Basin: Hrvaćani ( Bosnia and Herzegovina) ( Atanacković 1985).

Figures

FIGURE 1. A. Map of central and south–eastern Europe, representing the area that was partly covered by the Central Paratethys Sea (for detailed maps with the localities mentioned in the text see Kroh (2005) and Nosowska (2020). The white insert corresponds to the area that is restored in the palaeogeographic map below. B. Palaeogeography of the Middle Miocene Paratethys Sea (modified from Harzhauser & Landau 2017) showing the most important sedimentary basins (NAFB: North Alpine Foreland Basin, E–Sopr B: Eisenstadt–Sopron Basin).

FIGURE 2. Measurements for shell morphology and whorl profiles. SL: shell length, MD: maximum diameter, AA: apical angle, LWH: last whorl height, AH: aperture height. AL: aperture length. AW: aperture width. S: length of siphonal canal.

FIGURE 9. A1–A2. Fraudiziba mathiasi (Bałuk, 1997), Lăpugiu de Sus (Romania), NHMW 1854/0035/0085. B1–B2. Fraudiziba mathiasi (Bałuk, 1997), holotype, Lăpugiu de Sus (Romania), NHMW 2020/0101/0001. C1–C2. Fraudiziba mathiasi (Bałuk, 1997), Lăpugiu de Sus (Romania), NHMW 1854/0035/0100. D1–D2. Fraudiziba paratethyca nov. nom., lectotype, Pötzleinsdorf-Vienna (Austria), NHMW 1846/0037/0108. E1–E2. Fraudiziba paratethyca nov. nom., paralectotype, Gainfarn (Austria), NHMW 2020/0105/0001. F1–F2. Fraudiziba paratethyca nov. nom., paralectotype, Gainfarn (Austria), NHMW 2020/0103/0001. G. Gainfarn (Austria), NHMW 1863/0015/0921. H1–H2. Fraudiziba subcarinata (Bellardi, 1887), Modra- Kráľová (Slovakia), NHMW 2020/0102/0001. I1–I2. Fraudiziba subcarinata (Bellardi, 1887), Bujtur (Romania), NHMW 1861/0033/0010. J1–J2. Fraudiziba rudolfi (Bałuk, 1997), holotype, Pöls (Austria), NHMW 1861/0001/0238.