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The Mediterranean Sea houses a rather diverse chiton fauna (Mollusca: Polyplacophora). Four are here described as new, all based upon loose valves recovered from biogenic sediments: Leptochiton freiwaldi sp. nov., Hanleya schwabei sp. nov., "Ischnochiton" luquei sp. nov., Acanthochitona barbarae sp. nov. The updated Mediterranean Sea chiton fauna comprehends as many as 47 species, distributed in the families Leptochitonidae (15 species), Hanleyidae (3 species), Ischnochitonidae (7 species), Callistoplacidae (1 species), Chaetopleuridae (1 species), Callochitonidae (3 species), Chitonidae (5 species), Lepidochitonidae (6 species), Tonicellidae (1 species), Acanthochitonidae (5 species). Seven taxa are only known from loose valves: Leptochiton antondohrni, L. freiwaldi sp. nov., Hanleya schwabei sp. nov., "Ischnochiton" luquei sp. nov., Lepidochitona marcoi, Boreochiton ruber and Acanthochitona barbarae sp. nov. Similarly to other deep-sea mollusks described from the Mediterranean basin, some of them could possibly belong to last glacial Pleistocene submerged assemblages. On the contrary, Hanleya schwabei sp. nov. and Acanthochitona barbarae sp. nov. occur also at shallower depths, and are assigned to the modern Mediterranean fauna. The presence of the Atlantic taxon Chaetopleura angulata could be an accidental introduction into the Mediterranean. The species Tegulaplax hululensis, considered a Lessepsian immigrant, is a potentially forerunner of a more massive introduction of tropical Polyplacophora via the Red Sea. This study set a baseline for a better understanding of the evolutionary and biogeographic patterns of the Mediterranean Polyplacophora.

In the present paper we used a molecular data set (including mitochondrial partial 16S rRNA and COI gene sequences) to examine the genetic structure of Lepidopleuruscajetanus (Poli, 1791) (Polyplacophora, Leptochitonidae) - a distinctive shallow water chiton and member of the basal branching Lepidopleurida, which is widespread in and adjacent to the Mediterranean. The analyses of the two mt-standard marker fragments resolved two main discrete clusters reported as L.cajetanus s.s. and L.aff.cajetanus, respectively. Lepidopleuruscajetanus s.s. is widespread throughout the area under study, while the second distinct lineage apparently co-occurs on the eastern Spanish mainland coast of the Balearic Sea. This result is discussed comparing our data with those reported, in 2014, by Fernández and colleagues who described L.cajetanus as exhibiting "a 'chaotic patchiness' pattern defined by a high genetic variability with locality-exclusive haplotypes, high genetic divergence, and a lack of geographic structure". Although genetic data alone are not sufficient to draw any definitive conclusions, nevertheless we believe that present results shed new light on L.cajetanus which apparently shows more geographically patterned genetic structure than supposed so far., (Mariastella Colomba, Julia D. Sigwart, Walter Renda, Armando Gregorini, Maurizio Sosso, Bruno Dell’Angelo.)

This study describes the chiton fauna (Mollusca, Polyplacophora) from the marine Pleistocene coral reef deposits bordering the Red Sea coast and dating to the last interglacial epoch (Marine Isotopic Substage 5e, MIS5e). Twenty-one species were identified, of which only three were previously known from the Pleistocene of the Red Sea (Lucilina sueziensis, Acanthopleura vaillantii and Acanthochitona penicillata). Eight are recorded as fossil for the first time. Six are described as new (Lucilina confusa n. sp., L. aqabaensis n. sp., L. aegyptiaca n. sp., L. colantonii n. sp., "Onithochiton" vandingeneni" n. sp., and Acanthochitona interglacialis n. sp.) and two are assigned at generic level (Callochiton sp. and Craspedochiton sp.). Four of these new species (Lucilina confusa n. sp., L. aegyptiaca n. sp., L. colantonii n. sp. and "Onithochiton" vandingeneni n. sp.) are still living in the Red Sea, bringing to 28 the number of extant species known from the Red Sea. These Pleistocene Red Sea assemblages represent the most diverse chiton fauna yet reported from any interglacial deposit worldwide.

The paper covers 11 species of naticid gastropods occurring in the lower Serravallian (Upper Badenian) strata of western Ukraine (Central Paratethys). The studied material (over 1,700 naticids) represents six genera and 11 species, of which eight are new: Cochlis odovychenorum, Cochlis ukrainensis, Tectonatica anistratenkorum, Tectonatica pseudoprietoi, Euspira sirenkoi, Payraudeautia ermesi, Payraudeautia sabrinae and Payraudeautia varovtsiana. Additionally, we have also identified Euspira protracta (Eichwald, 1830), Polinices staszici (Friedberg, 1923) and Sinum affinis (Eichwald, 1830). A lectotype of Sinum affinis is designated (ZISP 1/62208). Detailed descriptions of the protoconch and teleoconch morphology of the taxa involved, including SEM images, are presented.