Fraudiziba ottomanica Harzhauser & Landau 2021, nov. sp.
Creators: name: Harzhauser, Mathias
name: Landau, Bernard
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Mitridae
Fraudiziba
Fraudiziba ottomanica

description: 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.
description: Published as part of Harzhauser, Mathias & Landau, Bernard, 2021, The Mitridae (Gastropoda: Neogastropoda) of the Miocene Paratethys Sea, pp. 1-72 in Zootaxa 4983 (3) on pages 42-43, DOI: 10.11646/zootaxa.4983.1.1, http://zenodo.org/record/4921887