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Besides, C. marioni, yet unmistakable, shows a wider MolluscaBase eds, 2020. MolluscaBase. Accessed at http://
morphological range then previously recorded. Indeed, www.molluscabase.org on 2020-05-22
besides “small” ones, also average-sized specimens ex- MolluscaBase eds, 2020a. Crisilla Monterosato, 1917. Ac-
hibit a certain variability in spire height, whorl convex- cessed through: World Register of Marine Species at: http://
ity or sculpture density (Fig. 2. A-D). In particular shells www.marinespecies.org/aphia.php?p=taxdetails&id=
collected in deeper waters seem to have a lighter and 138446 on 2020-05-22.
denser sculpture (Fig. 2. B-D). Hoenselaar H.J. & Hoenselaar J., 1994. Conchological differ-
ences between Crisilla marioni (Fasulo & Gaglini, 1987) and
Crisilla cristallinula (Manzoni, 1868) (Gastropoda Proso-
Acknowledgements branchia: Rissoidae). Basteria, 58: 195-197.
Monterosato T. A. (di), 1884. Nomenclatura generica e specifica
Stefano Bartolini, Cesare Bogi, Alessandro Raveggi, Ma- di alcune conchiglie mediterranee. Palermo, Virzi, 152 pp.
ria Scaperrotta and Franco Siragusa, loaned their mater- Monterosato T. A. (di), 1917. Molluschi viventi e quaternari
ial and shared literature and data. Stefano Bartolini pro- raccolti lungo le coste della Tripolitania dall’Ing. Camillo
vided digital photographs, Emilio Rolán and Daniele Crema. Bollettino Zoologico Italiano, 4 (3): 1-28, pl. 1.
Scarponi provided SEM photographs. Italo Nofroni Oliver J. D., Rolán E. & Templado J., 2019. The littoral spe-
shared useful information and suggestions. Andrea Be- cies of the genus Crisilla Monterosato, 1917 (Caenogastro-
nocci provided a critical reading of the manuscript. poda, Rissoidae) in Azores, Madeira, Selvagens and Canary
Islands with notes on West African taxa and the description
of four new species. Iberus, 37 (1): 23-80.
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