A new genus and species of Hydrobiidae is described from north central Peloponnese peninsula, Greece: Tridentalia lykaia. Additionally a note on Achaiohydrobia Falniowski, 2021 is given: Achaiohydrobia moreana Hofman & Grego, 2021 is a junior synonym of Bythinella corrosa Glöer & Hirschfelder, 2020.
Four species of the family Fissurellidae were identified from two deep bathyal samples from the Cape Verde Islands and on the Mid-Atlantic Ridge. Cornisepta magna spec. nov. Is described from off Sao Nicolau, Cape Verde islands. Cornisepta microphyma, Profundisepta bipolar spec. nov. and an undescribed species of the genus Fissurisepta were found on the Mid Atlantic Ridge.
Six new species of the genera Opisthostoma W.T. & H.F. Blandford, 1860 and Plectostoma H. Adams, 1865 (Architaenioglossa, Diplommatinidae) are described from Sarawak (Malaysia), on the island of Borneo.
A new fossil species of the genus Canariella, C. gerti, classified in the subgenus Majorata Alonso & Ibáñez, 2006, is described from Quaternary eolianites from the northwestern part of Fuerteventura, Canary Islands. Its relationships to other taxa of the family occurring on the Canary Islands and especially on Fuerteventura are discussed.
This paper reviews the Rissoinidae and Zebinidae collected during the Rumphius Biohistorical Expedition to Ambon, in 1990, with additional material collected by the second author (hls). In all, 30 species belonging to the family Rissoinidae and 12 species belonging to the family Zebinidae are recognised. The wellknown species are listed with a short synonymy and the poorly known species are redescribed in detail and illustrated. The biogeographical relationships of the rissoinid and zebinid fauna from Ambon are briefly discussed.
Collections in 2007 of 634 stations at 21 sites in northern Madagascar yielded 35 species and subspecies of rhytidoid land snails: Ampelita akoratsara akoratsara Emberton, 1999, A. akoratsara paulayi subspec. nov., A. analamerae Emberton, 1999, A. andavakoerae spec. nov., A. anjajaviensis spec. nov., A. atropos (Deshayes, 1850), A. capdambrae spec. nov., A. celestinae spec. nov., A. clotho (Deshayes, 1850), A. consanguinea (Deshayes, 1850), A. ela spec. nov., A. gaudens (Mabille, 1884), A. granulosa (Deshayes, 1850), A. kendrae spec. nov., A. kirae spec. nov., A. lachesis (Deshayes, 1850), A. lamarei lamarei (L. Pfeiffer, 1846), A. lamarei sakalava (Angas, 1878), A. lincolni spec. nov., A. masoalae Emberton, 1999, A. michellae spec. nov., A. miovaova spec. nov., A. niarae spec. nov., A. stilpna (Mabille, 1884), A. thompsoni spec. nov., Eurystyla ambatoensis (Emberton & Griffiths, 2009), E. julii julii (Fischer-Piette & Garreau, 1965), E. julii kely subspec. nov., E. julii soa (Emberton & Griffith, 2009), Paraclavator moreleti (Deshayes, 1851), Embertoniphanta amphibulima (L. Pfeiffer, 1847), E. echinophora (Deshayes, 1850), E. oviformis (Grateloup, 1840), E. josephinae spec. nov., and E. socii (Fischer-Piette, F. Blanc & Salvat, 1975).
Live adults of 17, and tissue samples of 22, of these 35 taxa were collected. The new species bring Madagascar’s total described rhytidoid species to 135. More await discovery, both within Madagascar’s forests and within extensive, unidentified collections from 1995-1996.
Discoveries include: (a) the hairy-shelled Embertoniphanta echinophora has a broad rainforest distribution and has an isolated, deciduous-forest, sister species, E. josephinae spec. nov.; (b) the gigantic (shell height 91.7 mm), micro-endemic Embertoniphanta socii is effectively absent from northern Ankarana; (c) the Eurystyla radiation is much more extensive than previously imagined; (d) southern Namoroka Reserve is not the home of its namesake Ampelita namerokoensis Fischer-Piette, 1952 (described from Bemaraha, far to the south!), but of A. thompsoni spec. nov.; (e) A. miovaova spec. nov., as proposed, is one of the most conchologically variable species of land snails; (f) A. lincolni spec. nov. is now the largest known Ampelita (73.5 mm diameter).
Type specimens of Polyplacophora present in the collections of the Nationaal Natuurhistorisch Museum, Leiden, formerly Rijksmuseum van Natuurlijke Historie (RMNH), and the Zoölogisch Museum Amsterdam (ZMA), now merged in the Naturalis Biodiversity Center, are listed. In total there is type material of 183 different species, consisting of 87 primary types (including 41 pro parte types) and 197 secondary type samples. On two plates are depicted the original coloured drawings of the newly described species by Nierstrasz (1905) published in ‘’Der Chitonen der Siboga Expedition’’. In addition an overview of all recent polyplacophoran species present in the two major molluscan collections in the Netherlands (Naturalis Biodiversity Center and Natuurhistorisch Museum Rotterdam (NMR)) is presented, including localities (country level) and number of samples. The history of the collections from both former RMNH, ZMA and NMR is summarized.