Rissoa curticostata Wood, 1848

Bouchard, Blanche, Wesselingh, Frank P., Pouwer, Ronald & Landau, Bernard, 2025, The Gelasian gastropod fauna of Selsoif (Manche, France), Geodiversitas 47 (3), pp. 39-91 : 62

Rissoa curticostata Wood, 1848

( Fig. 9A 1-A 3 )

Rissoa curticostata Wood, 1848: 102 . — Raad et al. 2013: 55, fig. 26.

Rissoa semicostata – Wood 1848: 102, pl. 11, fig. 10 (non Montagu, 1803). — Harmer 1920: 634, pl. 51, fig. 16 (not fig. 17).

Rissoa (Turboella) curticostata – Van Regteren Altena et al. 1954: 13, pl. 4, fig. 41. — Marquet 1997: 15, pl. 2, fig. 4.

MATERIAL AND DIMENSIONS. — Maximum height 1.6 mm, width 1.0 mm. — RGM.1364990 (273), leg. ACJ ; RGM.1365196 (1), leg. AWJ ; RGM.1365092 (66), leg. AWJ ; RGM.1364915 (4), leg. WG .

SPECIES CHARACTERISATION. — Small broad rissoiform shell. Three, flattened protoconch whorls. Four teleoconch whorls. Sculpture of around 16 strong, orthocline ribs covering numerous spiral ribs. Base covered by five weak spiral cords. Umbilicus closed; aperture ovate, thick, denticulate outer lip.

DISTRIBUTION. — Upper Pliocene: NSB, Red Crag, England (Harmer 1920), Belgium ( Marquet 1997). — Pliocene to Lower Pleistocene (indeterminate): Netherlands (Van Regteren Altena et al. 1954; Raad et al. 2013). — Lower Pleistocene: NSB, England ( Wood 1848; Harmer 1920); Atlantic, Selsoif, NW France (this paper).

REMARKS

Wood (1848: 102) figured this species under the name Rissoa semicostata Woodward but stressed that it was not the same species as R. semicostata Montagu, 1803 and in his discussion proposed the name R. curticostata for the Crag species. Harmer (1920: 634) argued that Woodward’s name was available because Montagu's species was a junior subjective synonym of R. striata J. Adams, 1797 . However, J. Adams’s name is an unavailable basionym.

Figures

FIG. 9. — Gastropods from Selsoif. All illustrated specimens are collected from the Sablière du Grand Marais, Selsoif, France and come from the Early Pleistocene Saint-Nicolas de Pierrepont Formation (continuation): A, Rissoa curticostata Wood, 1848, RGM.1365196, leg AWJ, H = 1.58 mm; B, Rissoa parva (da Costa, 1778), RGM.1365260, leg ACJ, H = 1.83 mm; C, Ecrobia cf. ventrosa (Montagu, 1803), RGM.1365261, leg ACJ, H = 1.4 mm; D, Peringia ulvae (Pennant, 1777), RGM.1365198, leg ACJ, H = 2 mm; E, Caecum glabrum (Montagu, 1803), RGM.1365191, leg AWJ, H = 1 mm; F, Tornus subcarinatus (Montagu, 1803), RGM.1405531, leg ACJ, H = 2.26 mm. Scale bars: A-D, 500 μm; E, 200 μm; F, 1 mm.

FIG. 1. — Simplified geological map of the Normandy region (after Dugué et al. 2000 and Pareyn 1987) showing the location of Selsoif:1, Precambrian-Palaeozoic basement; 2, Permo-Mesozoic Paris Basin fill; 3, Neogene-Quaternary subbasins.

FIG. 3. — Simplified biographic map of South-West of Europe (after Landau et al. 2011).