Cerithiidae, Fleming, 1822

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 : 316

Cerithiidae indet. ( Fig. 7H )

MATERIAL EXAMINED. — One specimen hosted in the NHMV (2008z0310/0004).

LOCALITY AND HORIZON. — Grey siltstone, KIrkkavak Formation (Macunköy: sample G4).

DESCRIPTION

Large,teloconch with five spiral whorls (apex missing). Eight strong axial costae gradually becoming angular and more widely spaced in the middle of each whorl, as the spiral elements become more pronounced and the sutures more deeply impressed.The last whorl comprises slightly less than one half of the total height.The aperture is more angular than in the type specimen.

REMARKS

Unfortunately, we have no apex and complete apertural data. However, the large shell is very close to Cerithium in having strongly developed spiral sculpture and projecting tubercules.The specimen can also be compared to Vicinocerithium Wood, 1910 (type species is Vicinocerithium bouei ( Deshayes, 1824) , Europe, Eocene),which has a prominent spiral band, spinose tubercules and axial elements. Benoistia (type species Cerithium muricoides Lamarck,1804 , Middle Eocene [Lutetian], Paris Basin) is morphologically similar, but has a smaller shell with a higher apical angle ( Cossmann 1906: 98, pl. 4. figs 24-27).

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.