Terebralia sp. 1

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 : 318

Terebralia sp. 1 ( Fig. 7C )

MATERIAL EXAMINED. — One specimen deposited in NHMV (2008z0310/0002), seven specimens in Ankara ( MTA-Y. İ.-2007 -51 and 52).

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

DESCRIPTION

Medium in size, turreted-conical shell, teleoconch with more than six short flat whorls; body whorl one-third of total; sutures only slightly impressed; three spiral cords intersecting 15 or 16 axial costae and forming blunt, widely spaced tubercules. Base ornated with 5 or 6 spiral ribs, rounded body whorl; medium-sized anterior canal.

REMARKS

The oldest species of this genus known so far are Terebralia subcorvina (Oppenheim, 1894) from the Lutetian of Gánt ( Kowalke 2001), T. bonellii ( Deshayes, 1833) from the Paris Basin ( Deshayes 1824) and the Hampshire Basin, England ( Wrigley 1940). The present species is related to T. bonellii , but differs in having less impressed sutures and a conical shape, three spiral cords instead of four and larger tubercles. It differs from T. subcorvina by its much smaller size and by lacking the characteristic feature of decreasing sculpture in the course of the ontogeny.

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.