Ringicula minor ( Grateloup, 1838 )

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 : 346-348

Ringicula minor ( Grateloup, 1838)

(Fig. 7 C1, C2)

Auricula ringens var. b. minor Grateloup, 1838: 286 , pl. 6, fig. 8.

Ringicula minor – Landau et al. 2013: 326 , pl. 52, fig.16, pl. 76, fig. 14, pl. (cum syn.).

MATERIAL EXAMINED. — Sample F11: AMPG ( IV) 2488-2531 (44 specimens); sample F12: AMPG ( IV) 2532-2540 (nine specimens) .

DIMENSIONS. — Maximum height: 4.70 mm.

DISTRIBUTION. — Early Miocene. NE Atlantic: France ( Peyrot 1932; Lozouet et al. 2001; Lesport & Cahuzac 2005; Cahuzac et al. 2012); Proto-Mediterranean Sea: Greece (this paper); Paratethys: Slovakia ( Harzhauser et al. 2011).

Middle Miocene. NE Atlantic: France ( Peyrot 1932); Proto-Mediterranean Sea: Turkey ( Landau et al. 2013); Paratethys: Austria ( Hörnes 1852), Hungary ( Strausz 1966).

REMARKS

In many specimens the outer lip and the parietal callus are not callous. This was also observed in French representatives of Ringicula minor from the Aquitaine Basin ( Lozouet et al. 2001). The large number of fragments documents that this species was among the most frequent species in the shallowmarine assemblage of Felli.

Ringicula minor is a widespread European species ( Harzhauser 2014; Landau et al. 2013).

Order CEPHALASPIDEA P. Fischer, 1883

REMARK

Cephalaspidea have been studied recently with an aim to better understand the phylogeny of this diversified order of marine gastropods ( Malaquias et al. 2009; Oskars et al. 2015). Even though the relationships between families was clarified by Oskars et al. (2015), the superfamilies Bulloidea Gray, 1827 and Diaphanoidea Odhner, 1914 (1857) remain non monophyletic, with the family Retusidae being paraphyletic.

Figures

FIG. 7. — A1-A3, Mathilda sp., AMPG(IV) 2478; B1, B2, Acteon cf. pinguis d’Orbigny, 1852: B1, AMPG(IV) 2479 (SEM image); B2, AMPG(IV) 2479, detail of microsculpture (SEM image); C1, C2, Ringicula minor (Grateloup, 1838), AMPG(IV) 2488; D1-D3, Retusa truncatula (Bruguière, 1792): D1, D2, AMPG(IV) 2541; D3, AMPG(IV) 2542 (SEM image); E1, E2, Pyrunculus sp., AMPG(IV) 2545; F1, F2, Volvulella acuminata (Bruguière, 1792), AMPG(IV) 2547; G1-G3, Pyramidella cf. plicosa Bronn, 1838: G1, G2, AMPG(IV) 2554; G3, AMPG(IV) 2555 (SEM image); H1-H3, ‘Odostomia’ sp. 1, AMPG(IV) 2557; H3, AMPG(IV) 2557 (SEM image); H4, AMPG(IV) 2557, apex (SEM image). Scale bars: A1-A3, C1, C2, E1, E2, F1, F2, G1, G2, H1, H2, 1 mm; B1, 200 µm; B2, H4, 100 µm; D1, D2, H3, 500 µm; D3, G3, 400 µm.