Costoanachis cf. terebralis (Grateloup, 1834)(Fig. 6 A1, A2) cf. Nassa terebralis Grateloup, 1834: 271, no. 512. cf. Costoanachis terebralis – Landau et al. 2013: 188, pl. 28, fig. 11, pl. 66, fig. 8, pl. 67, fig. 1 (cum syn.). MATERIAL EXAMINED. — Sample F11: AMPG (IV) 2464-2466 (three specimens); sample F12: AMPG (IV) 2467 (one specimen). DIMENSIONS. — Maximum height: 5 mm. DISTRIBUTION. — Costoanachis terebralis, Early Miocene. NE Atlantic (Aquitanian-Burdigalian): France (Peyrot 1925; Lozouet et al. 2001); North Sea Basin (late Burdigalian-Langhian): the Netherlands (A.W. Janssen 1984), Germany (Stein et al. 2016). Costoanachis terebralis, Middle Miocene. NE Atlantic: France (Peyrot 1925; Landau et al. 2013); Proto-Mediterranean Sea: Turkey (Landau et al. 2013); Paratethys: Poland (Bałuk 1995), Austria (Hörnes 1852), Hungary (Strausz 1966). Costoanachis terebralis, Late Miocene. NE Atlantic: France, Portugal (Landau et al. 2013). Costoanachis cf. terebralis, Proto-Mediterranean Sea: Greece (this paper). REMARKS The specimens recovered from the present material are very close to Costoanachis terebralis (Grateloup, 1834), which is a rather widespread European species. Its members present morphological variations that mainly concern the width of the shell and the spacing of axial sculpture. The present specimens are on the more slender side of the morphology, most similar to the specimens described in A.W. Janssen (1984). It differs from C. corrugata (Brocchi, 1814) in having a smaller shell and no spiral sculpture, although some very inconspicuous spiral threads are observed between the axial ribs in a juvenile specimen from Felli. The protoconch is multispiral and dome-shaped, the corrosion of the recovered shells does not allow for a detailed description.

Published as part of Thivaiou, Danae, Harzhauser, Mathias & Koskeridou, Efterpi, 2019, Early Miocene Gastropods from the Felli Section (Proto-Mediterranean Sea NW Greece), pp. 323-366 in Geodiversitas 41 (8) on page 342, DOI: 10.5252/geodiversitas2019v41a8, http://zenodo.org/record/3700008