Abstract
This paper presents an investigation of material collected during four intensive collecting trips of land snails in French Guiana from 1995 to 2020 and deposited in the French National Museum of Natural History collections. This material forms the basis of the following novelties: four families are reported for the first time from French Guiana: Diplommatinidae, Cystopeltidae, Thysanophoridae and Strobilopsidae; three native species: Lyroconusplagioptycha (Helicoidea, Thysanophoridae), Pupisomamacneilli (Pupilloidea, Valloniidae) and Strobilopsmorsei (Pupilloidea, Strobilopsidae) and one introduced species Diplosolenodesoccidentalis (Veronicelloidea, Veronicellidae) are reported for the first time from French Guiana; five new species are described: Adelopomaquasimodo Gargominy, sp. nov. (Cyclophoroidea, Diplommatinidae), Lilloiconchagalbao Gargominy, sp. nov. (Punctoidea, Cystopeltidae), Protoglyptusbernicolae Gargominy, sp. nov. (Orthalicoidea, Bulimulidae), Pseudosubulinasanti Gargominy, sp. nov. (Testacelloidea, Spiraxidae), and Happiadecaensi Gargominy, sp. nov. (Scolodontoidea, Scolodontidae). Finally, Drymaeussurinamensis Vernhout, 1914, syn. nov. is considered as a new synonym of Mesembrinuslusorius (L. Pfeiffer, 1855), and Drymaeusarcuatostriatus (L. Pfeiffer, 1855) is proposed as the new identification of Drymaeusmeesi sensu Tillier, 1980 non Breure, 1976.