The Gelasian gastropod fauna of Selsoif (Manche, France) Author Bouchard, Blanche Université de Rennes, Campus de Beaulieu, 263 avenue Général Leclerc 35042 Rennes (France) bouchardblanche @ gmail. com (corresponding author) bouchardblanche@gmail.com Author Wesselingh, Frank P. Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden (The Netherlands) and Department of Earth Sciences, Utrecht University, Princetonlaan 8 a, 3584 CB Utrecht (The Netherlands) Author Pouwer, Ronald Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden (The Netherlands) Author Landau, Bernard Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden (The Netherlands) text Geodiversitas 2025 2025-02-06 47 3 39 91 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a3.pdf journal article 308077 10.5252/geodiversitas2025v47a3 2b690685-9303-4885-bf94-1efe836e6349 1638-9395 14823602 urn:lsid:zoobank.org:pub:BE95BEFE-D4E3-4138-B9BE-5A5656BEA68F Pusillina aff. inconspicua (Alder, 1844) ( Fig. 8F 1-F 3 ) MATERIAL AND DIMENSIONS . — Maximum height 1.3 mm , width 0.8 mm . — RGM.1365258 (1), leg. ACJ ; RGM.1365125 (5), leg. AWJ ; RGM.1365097 (62), leg. AWJ ; RGM.1405528 (2), leg. ACJ ; RGM.794506 (1), leg. AWJ . SPECIES CHARACTERISATION . — Small rather high-spired rissoiform shell. Protoconch not preserved. Five convex teleoconch whorls separated by a deep suture. Sculpture variable mostly smooth but with some specimens consisting of numerous sinuous, opisthocline ribs strengthening towards abapical suture. Base rounded, smooth. Aperture ovate, angled at anal sinus. FIG . 8. — 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 , Alvania cf. cancellata ( da Costa,1778 ),RGM.1364986,leg ACJ,H = 2.64 mm; B , Alvania selsoifensis n. sp. ( holotype) , RGM.1365286,leg ACJ,H = 1.28 mm; C , Alvania sp.1 , RGM.1365090,leg AWJ,H = 1.39 mm; D , Manzonia crassa ( Kanmacher,1798 ) ,RGM.1365201, leg ACJ, H = 1.68 mm; E , Onoba semicostata ( Montagu, 1803 ) , RGM.1365197, ACJ, H = 1.9 mm; F , Pusillina aff. inconspicua (Alder, 1844) , RGM.1365258, leg ACJ, H = 1.3 mm. Scale bars: A, 1 mm; B-F, 500 μm. REMARK The overall characters resemble those of Pusillina inconspicua (Alder, 1844) but the specimens studied from Selsoif are consistently taller. Possibly this represents a new species, but the poor preservation and lack of protoconch preclude a formal description. DISTRIBUTION . — Lower Pleistocene : Atlantic, Selsoif, NW France (this paper).