The new Checklist of the Italian Fauna: marine Mollusca.

The mollusc fauna of the Mediterranean Sea is still considered as the best-known marine mollusc fauna in the world. The previous modern checklists of marine Mollusca were produced by joint teams of amateurs and professionals. During the last years the Italian Society of Malacology (Società Italiana di Malacologia – S.I.M.) maintained an updated version of the Mediterranean checklist, that served as the backbone for the development of the new Italian checklist. According to the current version (updated on April 1st, 2021), 1,777 recognised species of marine molluscs are present in the Italian Economic Exclusive Zone, including also the Tyrrhenian coasts of Corsica and the continental shelf of the Maltese archipelago. The new checklist shows an increase of 17% of the species reported in the 1995 Checklist. This is largely (yet not solely) due to the new wave of studies based on Integrative Taxonomy approaches. A total of 135 species (7.6%) are strictly endemic to the Italian waters; 44 species (2.5%) are alien and correspond to the 28% of the Mediterranean alien marine molluscs. All eight extant molluscan classes are represented. The families represented in the Italian fauna are 307, an increase of 14.6% from the first checklist, partly due to new records and partly to new phylogenetic systematics. Compared with the whole Mediterranean malacofauna, the Italian component represents 71% in species and 61% in families, which makes it a very remarkable part of the Mediterranean fauna

Catalogue of the primary types of marine molluscan taxa described by Tommaso Allery Di Maria, Marquis of Monterosato, deposited in the Museo Civico di Zoologia, Roma

We have compiled a complete list of new marine molluscan taxa introduced by Tommaso Allery Di Maria, Marquis of Monterosato (1841–1927). The dates of publication of every single work have been checked against available evidence, and an updated bibliography is also presented. Finally, the type material of all marine taxa expected to be in the collection Monterosato (presently preserved in the Museo Civico di Zoologia in Rome) has been searched in the main collection, and all retrieved specimens have been catalogued. A large majority of the material has been found, representative specimens of each taxon have been illustrated, and remarks on nomenclature and taxonomy have been provided yielding 42 new synonymies, 46 nominal taxa rediscovered, and 6 new combinations

FIGURE 11. A, B. Hyaloscala spirilla Monterosato, 1890 in Catalogue of the primary types of marine molluscan taxa described by Tommaso Allery Di Maria, Marquis of Monterosato, deposited in the Museo Civico di Zoologia, Roma

FIGURE 11. A, B. Hyaloscala spirilla Monterosato, 1890, SEM images, Palermo (Sicily), H. 3 mm, with original labels (MCZR–M–23467); C, D. Scalaria striatissima Monterosato, 1878, Palermo (Sicily), H. 8.4 mm, with original labels (MCZR– M–23508); E, F. Amethistina laeta Monterosato, 1884, lectotype, Algiers (Algeria) H. 13.5 mm (ex Joly coll.) with original label (MCZR–M–23414); G, H. Janthina splendens Monterosato, 1884, lectotype, Alessandria (Egypt) H. 14.4 mm (ex Lothellerie coll.) with original label (MCZR–M–23423); I, J. Cerithiopsis contigua Monterosato, 1878, Casablanca (Morocco), H. 4.3 mm, with original label (MCZR–M–21158); K, L. Cerithiopsis diadema Monterosato, 1874 ex Watson ms., Madeira, H. 3.5 mm, (ex Watson coll.) with original labels (MCZR–M–21014); M, N. Cerithiopsis perlata Monterosato, 1889, Rabat (Marocco), H. 4.9 mm, with original label (MCZR–M–21151); O, P. Cerithiopsis tiara Monterosato, 1874 ex Watson ms., lectotype, Madeira, H. 4.5 mm, with original labels (MCZR–M–21141); Q, R. Cerithiopsis horrida Monterosato, 1874 ex Jeffrey sms., Palermo (Sicily), H. 6.6 mm, with original labels (MCZR–M–21173)

FIGURE 15. A–C. Apicularia lia Monterosato, 1872 in Catalogue of the primary types of marine molluscan taxa described by Tommaso Allery Di Maria, Marquis of Monterosato, deposited in the Museo Civico di Zoologia, Roma

FIGURE 15. A–C. Apicularia lia Monterosato, 1872 ex Benoit ms., Messina (Sicily), H. 3.35 mm and H. 3.45 mm, with original label (MCZR–M–30014); D, E. Setia limpida Monterosato, 1884, Algiers (Algeria), H. 1.85 mm (ex Joly coll.), with original label (MCZR–M–22352); F–H. Setia limpida Monterosato, 1884, Marseille (France), H. 1.67 mm and H. 1.7 mm (ex Sollier coll.), with original label (MCZR–M–22352); I–K. Setia macilenta Monterosato, 1880, Palermo (Sicily), H. 1.4 mm and 1.1 mm, with original label (MCZR–M–22346); L, M. Cingula maculata Monterosato, 1869. Trapani (Sicily), H. 2.1 mm, with original labels (MCZR–M–22251); N, O. Barleeia majuscula Monterosato, 1884, Lampedusa Is., H. 4.35 mm, with original labels (MCZR–M–22309); P, Q. Barleeia minuscula Monterosato, 1889, Casablanca (Morocco), H. 2.8 mm, with original label (MCZR–M–22287); R, S. Sabanea munda Monterosato, 1884, Sfax (Tunisia), H. 4.5 mm (ex Pallary coll.), with original labels (MCZR–M–30015); T, U. Zippora paradoxa Monterosato, 1884, Sfax (Tunisia), H. 7.25 mm, with original label (MCZR–M–30016); V, W. Sabanea prismatica Monterosato, 1890, Palermo (Sicily), H. 2.15 mm, with original labels (MCZR–M–30017)

FIGURE 5. A, B. Gibbula isseli Monterosato, 1889 in Catalogue of the primary types of marine molluscan taxa described by Tommaso Allery Di Maria, Marquis of Monterosato, deposited in the Museo Civico di Zoologia, Roma

FIGURE 5. A, B. Gibbula isseli Monterosato, 1889, Costantinopoli (Turkey), H. 4.9 mm, with original label (MCZR–M– 11304); C–E. Trochus latior Monterosato, 1880, Sfax (Tunisia), H. 17.5 mm, with original labels (MCZR–M–11306); F, G. Zizyphinus linnaei Monterosato, 1884, Palermo (Sicily), H. 23.2 mm, with original label (MCZR–M–11543); H, I. Zizyphinus lissus Monterosato, 1889, Yorkshire (U. K.), H. 22.2 mm, with original label (MCZR–M–11578)

FIGURE 18. A, B. Vitreolina antiflexa Monterosato, 1884 in Catalogue of the primary types of marine molluscan taxa described by Tommaso Allery Di Maria, Marquis of Monterosato, deposited in the Museo Civico di Zoologia, Roma

FIGURE 18. A, B. Vitreolina antiflexa Monterosato, 1884, Palermo (Sicily), H. 3.3 mm, with original label (MCZR–M– 23601); C, D. Eulima beryllina Monterosato, 1878, Palermo (Sicily), H. 4.1 mm, with original labels (MCZR–M–23615); E, F. Eulima cionella Monterosato, 1878, Mondello (Sicily), H. 1.5 mm, with original label (MCZR–M–23901); G, H. Eulima curva Monterosato, 1874 ex Jeffreys ms., Trapani (Sicily), H. 3.4 mm, with original labels (MCZR–M–23626); I, J. Vitreolina devians Monterosato, 1884, Palermo (Sicily), H. 3.6 mm, with original labels (MCZR–M–23594); K, L. Aclis lineata Monterosato, 1869, Trapani (Sicily), H. 2 mm, with original labels (MCZR–M–23629); M, N. Acicularia lubrica Monterosato, 1890, England, H. 5.4 mm, with original label (MCZR–M–30021); O, P. Lacula mediterranea Monterosato, 1869, Palermo (Sicily), H. 2.2 mm, with original labels (MCZR–M–30022); Q, R. Acicularia monterosatoi Monterosato, 1890 ex De Boury ms., paralectotype, England, H 5.1 mm, with original labels (MCZR–M–23603); S, T. Eulima nana Monterosato, 1878, Palermo (Sicily), H. 2.5 mm, with original label (MCZR–M–30023); U, V. Acicularia translucens Monterosato, 1890 ex Brusina ms., Velirat (Croatia), H. 5.3 mm, with original labels (MCZR–M–30024); W, X. Lamellaria spirolineata Monterosato, 1869, Palermo (Sicily), H. 12.3 mm, with original labels (MCZR–M–23083)