Fraudiziba ottomanica, Harzhauser & Landau, 2021

Harzhauser, Mathias & Landau, Bernard, 2021, The Mitridae (Gastropoda: Neogastropoda) of the Miocene Paratethys Sea, Zootaxa 4983 (3), pp. 1-72 : 42-43

Fraudiziba ottomanica nov. sp.

Figs 11D 1 –D 2 , E 1 –E 2 , F 1 –F 2

Ziba goniophora ( Bellardi, 1850) — Landau et al. 2013: 213, pl. 34, figs 1, 2, pl. 68, fig. 7, pl. 80, fig. 9 [non Bellardi, 1850]

Type material. Holotype: NHMW 1847 /0058/0387, SL: 21.6 mm, MD: 7.4 mm, Seyithasan ( Turkey), illustrated in Landau et al. (2013, pl. 34, figs 1a–b), Figs 11D 1 –D 2 . Paratypes: NHMW 1847 /0058/0388, SL: 22.1 mm , MD: 7.5 mm, Seyithasan ( Turkey), illustrated in Landau et al. (2013, pl. 34, figs 2a–b), Figs 11E 1 –E 2 . RGM 77 882, SL: 15.8 mm , MD: 5.4 mm, Seyithasan ( Turkey), illustrated in Landau et al. (2013, pl. 80, figs 9a–b), Figs 11F 1 –F 2 .

Type locality. Seyithasan , Karaman Basin, Karaman Province, Turkey .

Type stratum. Týrtar Formation.

Age. Middle Miocene, Serravallian.

Etymology. Referring to the Ottoman Empire.

Diagnosis. Fraudiziba species of medium size, solid, moderately broad fusiform, with high spire, angulated shoulder, high last whorl, moderately narrow aperture, moderately short siphonal canal, intense colour pattern of large subquadrate blotches on shoulder and last whorl.

Description. Shell medium sized, moderately broad fusiform, solid. Protoconch paucispiral, consisting of about 1.25 smooth whorls with medium-sized nucleus. Teleoconch of nine whorls. Early teleoconch whorls straight sided, fifth to sixth whorl weakly convex in profile, coinciding with development of rounded shoulder, passing into angulation on penultimate and last whorls. Suture of early teleoconch whorls incised, faintly canaliculate, narrowly impressed on later whorls. Last whorl high, subcylindrical, slowly contracting. Aperture moderately narrow. Columellar callus narrow, extending from adapical columellar fold to tip of siphonal canal, thickened and sharply delimited from base in adult specimens. Columella with three oblique folds, decreasing in strength abapically, fourth columellar fold subobsolete. Outer lip thin. Siphonal canal moderately short, wide, straight, with shallow siphonal notch. Shell surface smooth except for broad spiral cords on base and fasciole.

Colour pattern under UV light consisting of spiral rows of subquadrate blotches, with row of larger dots at shoulder of last whorl (figs 11 F 1 –F 2).

Shell measurements and ratios. SL = 21.6–22.1 mm, MD: 7.4–7.5 mm, AA = 40–42°, SL/MD: 2.9–3.0, AL/ AW: 5.2–5.6, AH/S: 2.6.

Discussion. This species was identified as Ziba goniophora ( Bellardi, 1850) by Landau et al. (2013) but the Tortonian F. goniophora is stockier and bears punctate spiral grooves (see Bellardi, 1850, pl. 1, fig. 20), Bellardi, 1887a, pl. 4, fig. 8 and Ferrero-Mortara et al. (1981, pl. 48, figs 11a–b). Fraudiziba ottomanica is morphologically close to F. subcarinata (Bellardi, 1887) due to its angulated shoulder, but lacks spiral grooves on the spire whorls. Fraudiziba paratethyca nov. sp. is more slender, has a higher spire and lacks an angulation. In addition, F. ottomanica is characterised by its colour pattern of large subquadrate spots and blotches, whereas F. paratethyca has spiral rows of small dots and dashes.

Fraudiziba ottomanica does not occur in the Paratethys, but because of its close resemblance with Fraudiziba paratethyca nov. sp., it is desirable to describe this Turkish middle Miocene species formally to avoid future confusion.

Palaeoenvironment. Coastal, inner neritic depositional environments ( Landau et al. 2013).

Proto-Mediterranean Sea. Serravallian (middle Miocene): Karaman Basin: Seyithasan, Akpýnar-Pýnarlar Yaylasý, Gödet River across from Tilkikaya, roadcut at turnoff to Lale on Mut road ( Turkey). Some of the specimens described by Davoli (2000) as Ziba goniophora ( Bellardi, 1850) from the Tortonian of Montegibbio ( Italy) might be conspecific with the Turkish specimens.

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 11. A1–A2. Fraudiziba perangulata (Peyrot, 1928), lectotype, Manciet (France), MHNBx 2014.35.15.8. B1–B2. Fraudiziba perangulata (Peyrot, 1928), Manciet (France), 2014.35.15.46.0. C1–C2. Fraudiziba perangulata (Peyrot, 1928), Manciet (France), 2014.35.15.46.0 (pictures provided by Laurent Charles, Muséum de Bordeaux). D1–D2. Fraudiziba ottomanica nov. sp., holotype, Seyithasan (Turkey), NHMW 1847/0058/0387. E1–E2. Fraudiziba ottomanica nov. sp., paratype, Seyithasan (Turkey), NHMW 1847/0058/0388. F1–F2. Fraudiziba ottomanica nov. sp., paratype, Seyithasan (Turkey), RGM 77 882, in UV light.