Monoplex corrugatus ( Lamarck, 1816 )

Kovács, Zoltán & Vicián, Zoltán, 2017, Middle Miocene Tonnoidea and Ficoidea (Caenogastropoda) assemblages from Letkés (Hungary), Fragmenta Palaeontologica Hungarica 34, pp. 75-104 : 87

Monoplex corrugatus ( Lamarck, 1816)

(Figs 29–30)

1816 Triton corrugatum – LAMARCK, p. 5.

1966 Cymatium (Lampusia) affine Deshayes – STRAUSZ, p. 247, pl. 29, figs 8–11, pl. 30, figs 1–5. 2013 Monoplex corrugatus (Lamarck) – LANDAU et al., p. 127, pl. 18, figs 5–7 (cum syn.).

Material – 123 specimens (SL 18–74); HNHM: M.62.836., INV 2017.675. (9) , 113 specimens in private collections.

Description – Narrow, fusiform shell, elevated spire, six subangulate teleoconch whorls, broad, concave sutural ramp, last whorl 70% of the total height. Ovate aperture, denticulate outer lip thickened by labral varix, long, narrow, straight siphonal canal, concave columella with folds, long fasciole. Spiral sculpture of three primary and numerous secondary cords on the spire, six broad primaries on the last whorl, axial sculpture of seven prosocline rounded ribs, one varix per whorl.

Remarks – The species is characterized by large morphological variability, so Triton affine Deshayes – that was frequently recorded from the Mediterranean and the Paratethys – is considered as a junior synonym in the recent literature. M. corrugatus is abundant in the mollusc assemblage of Letkés.

Distribution – Burdigalian: PMS ( Italy), late Burdigalian-Langhian: NSB ( the Netherlands), Badenian: CP ( Austria, Bulgaria, Czech Republic, Hungary, Poland, Romania, Ukraine), Serravallian: PMS ( Turkey), Tortonian: NEA ( Portugal), PMS ( Italy). For Pliocene-Recent range see LANDAU et al. (2013).