This is the submitted version of the article: “Holyoak, D.T., Holyoak, G.A., Lima, R.F. de, Panisi, M. and Sinclair, F. 2020. A checklist of the land Mollusca (Gastropoda) of the islands of Sao Tome and Principe, with new records and descriptions of new taxa. Iberus, 38 (2): 219-319.” This version has not been peer-reviewed and is only being shared to comply with funder requirements. Please do not use it in any form and contact the authors (e.g.:
[email protected]) to get access to the accepted version of the article. 1 New species and genera and new island records of land snails (Gastropoda) from the islands of São Tomé and Príncipe Nueva especies de .... David T. HOLYOAK1, Geraldine A. HOLYOAK1, Ricardo F. de LIMA2,3, Martina PANISI2 and Frazer SINCLAIR3,4 Recibidio el ... ABSTRACT Seven species of terrestrial Gastropoda are newly described from the island of São Tomé and six more from the island of Príncipe. The genera involved are Chondrocyclus (Cyclophoridae), Maizania and Thomeomaizania (Maizaniidae), Pseudoveronicella (Veronicellidae), Nothapalus (Achatinidae: subfamily undet.), Gulella and Streptostele (Streptaxidae), Truncatellina (Truncatellinidae), Afroconulus (Euconulidae), Principicochlea gen. nov., Principotrochoidea gen. nov., Thomithapsia gen. nov. and Thomitrochoidea gen. nov. (Urocyclidae). Most of these are from natural forest habitats and are likely to be single- island endemics. Apothapsia gen. nov. (Helicarionidae) is also described to accommodate two previously known species. Additional new island records are of ten species on São Tomé, one on Príncipe alone and two more on both islands. These include six species of "microgastropods" with wider ranges in tropical Africa that are likely to be hitherto overlooked parts of the indigenous fauna and six anthropogenic introductions; Pseudopeas crossei previously known only from Príncipe and Bioko is newly recorded on São Tomé.