Vicinocerithium seni, Islamoğğlu & Dominio & Kowalke, 2011

Islamoğğlu, Yeşşim, Dominio, Stefano & Kowalke, Thorsten, 2011, Early Eocene Caenogastropods (Mollusca, Gastropoda) from Haymana-Polatl Basin, Central Anatolia (Turkey): taxonomy and palaeoecology, Geodiversitas 33 (2), pp. 303-330 : 322

Vicinocerithium seni n. sp. ( Fig. 7 E-G)

HOLOTYPE. — MTA-Y. İ.-2007 -34.

PARATYPES. —SevenparatypesinAnkara( MTA-Y. İ.-2007 -35 to 41) and one paratype ( NHMV 2008z0310/0001).

ETYMOLOGY. — In honour of Şevket Şen (CNRS, MNHN).

OTHER MATERIAL EXAMINED. — 118 specimens (MTA- Y. İ.-2007 -42 to 44).

TYPE LOCALITY AND HORIZON. — Grey siltstone-mudstone, KIrkkavak Formation (Macunköy: samples G1, G2, G3).

DESCRIPTION

Angular whorls with 6-8 irregular, primary and secondary spiral riblets and 9-10 strong axial elements forming big, strong and smooth tubercules, connected by more pronounced spiral elements. Prominent axial elements are formed by the coalescence of thick tubercules in the adapical part of the whorls. This structure is oblique prosocline from the initial whorls towards the body whorl. The concave base is ornamented by spiral riblets similar to the riblets in the base of each spiral whorl. The anterior canal is elongated and the aperture is cerithioid with oblique ovoidal siphonostome.

REMARKS

The species differs from Vicinocerithium cf. subacutum and Batillaria praesubacuta by its prominent axial elements and prominent spiral threads ( Doncieux 1908).

Figures

FIG. 7. — Caenogastropods (deposited in the repositories of the Natural History Museum of Vienna and in the General Directorate of Mineral Research and Exploration, Ankara): A, Tympanotonos sp.; B,?Melanoides sp.; C, Terebralia sp. 1; D, Terebralia sp. 2; E, Vicinocerithium seni n. sp. (paratype-Vienna museum); F, Vicinocerithium seni n. sp. (paratype-MTA, Ankara); G, Vicinocerithium seni n. sp. (holotype-MTA, Ankara); H, “Cerithiid” indet.; I, Haustator granulosa (Deshayes, 1824); J, Haustator sp.; A-D, G, H, NHMV; E, F, I, J, MTA. Scale bars: 1 cm.