Haustator sp.

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 : 323

Haustator sp. ( Fig. 7J )

MATERIAL EXAMINED. — One specimen hosted in Ankara ( MTA-Y. İ.-2007 -PolatlI-60).

LOCALITY AND HORIZON. — Grey siltstone, KIrkkavak formation (Macunköy: sample G2).

DESCRIPTION

Shell is medium sized, narrow-conic.The rather flat whorls bear eight to ten fine spiral ribs.Towards the abapical part, two ones are somewhat closer forming a rounded and thick spiral band. Last whorl is short with a flat base. Aperture is narrow.

REMARKS

Our specimen is very similar to syntype of “ Turritella ” ataciana d’Orbigny,1850 ( MNHN.F. R 64189; Early Eocene of Le Jarrier , Alpes-Maritimes , France; d’Orbigny 1850: t. 2, p. 310, fig. 232) in that both species have rounded spiral bands in the abapical part of the whorls, consisting of fine spiral lines and becoming thicker towards the last whorl. However, our specimen differs from “ T.” ataciana by its wider apex angle (16 °) and shorter shell with a lower number of turricated whorls (see Appendix 1) .

Haustator sp. also resembles the Oligocene species Haustator perfasciata Sacco, 1895 ( Haustator asperulus var. perfasicata Sacco, 1895 :t. 19, p. 17, pl.1, fig.63a, b) and Haustator conofasciata Sacco, 1895 ( Haustator conofasciatus Sacco, 1895 : t. 19, p. 18, pl. 1, fig. 67), which could be phylogenetically related. Haustator perfasciata is known from the Rupelian (formerTongriano) beds of Piedmonte basin (Northern Italy), whereas H. conofasciata is known from Oligocene (Northern Italy: Sacco 1895; Pakistan: Vredenburg 1928; Greece: Harzhauser2004;SWTurkey: İslamoğlu 2008). Haustator conofasciata has thick,keel-like spiral threads seperated by a deep incline in the abapical part of the whorls. Haustator perfasciata has a narrower shell with flat whorls and rounded spiral ribs forming a strong spiral band close to suture.

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.