Zebinella, Morch, 1876

Thivaiou, Danae, Harzhauser, Mathias & Koskeridou, Efterpi, 2019, Early Miocene Gastropods from the Felli Section (Proto-Mediterranean Sea NW Greece), Geodiversitas 41 (8), pp. 323-366 : 338-340

Zebinella sp.

( Fig. 5 F1, F2)

MATERIAL EXAMINED. — Sample F11: AMPG ( IV) 2451-2454 (four specimens).

DIMENSIONS. — Maximum height: 3.40 mm (incomplete).

DISTRIBUTION. — Early Miocene. Proto-Mediterranean Sea: Greece (this paper).

DESCRIPTION

Shell small, turriculate. Protoconch smooth, incomplete, of at least 2 whorls. Early teleoconch whorls convex, with fine sculpture of slightly opisthocline axial ribs, and a spiral cord approximately at mid-height of the whorl.Teleoconch whorls flat; sculpture consists of the same axial ribs, fine irregularly spaced spiral cords present between ribs. Cords become stronger after the fifth whorl abapically. Sutures fine, linear.

REMARKS

This Zebinella species is represented only by incomplete specimens. We place it in Zebinella and not Rissoina because of the fine axial sculpture and the elongated shape of the shell. It is reminiscent of Zebinella cf. decussata (Montagu, 1803) from the Serravallian of the Karaman Basin in Turkey ( Landau et al. 2013). Both taxa have delicate, flattened, opisthocline axial ribs, but the whorls of the Greek species are more convex.

The protoconch is incomplete in the present material, but seems to be smooth. A weak spiral cord appears on the first three teleoconch whorls teleoconch in the adapical half of the whorl, forming a weak angulation as in Zebinella cf. decussata ; some finer spiral threads appear after the fifth teleoconch whorl abapically, which seem to distinguish the present species.

Recent representatives of the genus have been found on reef slopes and in sands between coral patches ( Janssen et al. 2011).

Figures

FIG. 5. — A1, A2, Nodiscala cf. rugatina de Boury in Cossmann, 1912: A1, A2, AMPG(IV) 2335; B1, B2, Triphora (s.l.) sp.: B1, AMPG(IV) 2439 (SEM image); B2, AMPG(IV) 2439, protoconch (SEM image); C1-C4, Metaxia sp.: C1, AMPG(IV) 2443, protoconch (SEM image); C2, AMPG(IV) 2443 (SEM image); C3, C4, AMPG(IV) 2443; D1-D3, Dizoniopsis sp.: D1, D2, AMPG(IV) 2445; D3, AMPG(IV) 2446 (SEM image); E1, E2, Rissoina subconoidea (Grateloup, 1847); E1, E2, AMPG(IV) 2448; F1, F2, Zebinella sp., AMPG(IV) 2451; G1-G4, Alvania amphitrite n. sp.: G1, G2, holotype, AMPG(IV) 1503; G3, paratype 2, AMPG(IV) 1505 (SEM image); G4, paratype 2, AMPG(IV) 1505, protoconch (SEM image); H1-H4, Alvania transiens (Sacco, 1895): H1, H2, AMPG(IV) 2455; H3, AMPG(IV) 2456 (SEM image); H4, AMPG(IV) 2456, protoconch (SEM image); I1, I2, Xenophora sp., AMPG(IV) 2461. Scale bars: A,D1-D3, F1, F2, G1, G2, H1-H3, 1 mm; B1, C2-C4,E1, E2, G3,500 µm; B2, H4, 400 µm; C1, G4, 200 µm; I1, I2, 2 mm.