Tritia incrassata ( StrØm, 1768 )

Bouchard, Blanche, Wesselingh, Frank P., Pouwer, Ronald & Landau, Bernard, 2025, The Gelasian gastropod fauna of Selsoif (Manche, France), Geodiversitas 47 (3), pp. 39-91 : 70-72

Tritia incrassata ( StrØm, 1768)

( Fig. 11F 1-F 3 )

Tritonium incrassatum StrØm, 1768: 369 , pl. 16, fig. 25.

Nassa incrassata – Harmer 1914: 88, pl. 5, figs 25, 26.

Nassa (Hima) incrassata – Harmer 1918: 324, pl. 34, figs 8-10.

Hinia (Tritonella) incrassata – Brébion 1964: 464, pl. 11, figs 32, 33 [corresponds to Nassarius pacaudi Van Dingenen, Ceulemans, Landau & Silva, 2015 ]. — Cuerda Barceló 1987: 297, pl. 27, fig. 2 (lapsus, figs 22, 23). non Hinia (Tritonella) incrassata Müller, 1776 . Nassarius incrassatus – Landau et al. 2009: 33, pl. 6, figs 10-12. — Rijken & Pouwer 2014: 49, fig. 19. — Van Dingenen et al. 2015: 94, pl. 7, fig. 1.

For more, see synonymy list in Landau et al. (2009) and Van Dingenen et al. (2015).

MATERIAL AND DIMENSIONS. — Maximum height 11.5 mm, width 6.7 mm. — RGM.1364924 (299), leg. WG ; RGM.1365209 (1), leg. WG ; RGM.1365008 (178), leg. ACJ ; RGM.1365296 (1), leg. AWJ ; RGM.1008174 (1), leg. AWJ ; RGM.1008175 (100+), leg. AWJ .

SPECIES CHARACTERISATION. — Shell fusiform, with rounded whorls, separated by deeply impressed, undulating suture. Sculpture of 11- 15 rounded, undulating axial ribs, overrun by seven spiral cords per whorl. Outer lip strongly thickened by varix, bearing about seven irregular denticles within. Columella moderately expanded, bearing numerous rugae and tubercles, strong parietal tubercle. Siphonal fasciole broad, separated from base by broad groove.

DISTRIBUTION. — Lower Pliocene:?central Mediterranean, Italy ( Chirli 2000; needs confirmation). — Upper Pliocene: NSB, Red Crag, England (Harmer 1914, 1918); western Mediterranean, S Spain ( Landau et al. 2009). — Lower Pleistocene: Atlantic, Selsoif, NW France ( Van Dingenen et al. 2015), Sicily (NHMW coll.). — Middle Pleistocene: Wexford Gravels, Irish Sea (Harmer 1918); Netherlands ( Rijken & Pouwer 2014). — Upper Pleistocene: western Mediterranean, Balearic Islands ( Cuerda Barceló 1987). Today it is distributed in the eastern Atlantic from Iceland, Northern Norway to the Mediterranean, Canaries ( Poppe & Goto 1991), intertidal to 200 m.

REMARKS

For discussion seeLandau et al. (2009: 34) andVan Dingenen et al. (2015: 94). This is one of the most abundant molluscs in the Selsoif assemblage.

Figures

FIG. 11. — 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, Erato exmaugeriae Sacco, 1894, RGM.1365287, leg AWJ, H = 2.9 mm; B, Cryptonatica sp., RGM.1365218, leg AWJ, H = 1.37 mm; C, Euspira catena (da Costa, 1778), RGM.1365219, leg AWJ, H = 5.48 mm; D, Buccinum undatum Linnaeus, 1758, RGM.1365187, leg AWJ, H = 12 mm; E, Neptunea inversa Harmer,1918,RGM.1365188, leg ACJ, H = 13.7 mm; F, Tritia incrassata (Strøm, 1768), RGM.1365209, leg WG, H = 6.2 mm. Scale bars: A, 1 mm; B, 500 μm; C, F, 2 mm; D, E, 5 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).