Numerous new material of the genus Motonerus Hansen, 1989 (Coleoptera: Hydrophilidae: Sphaeridiinae) was examined over the past decade, resulting in the discovery of several undescribed species as well as new distributional records for most of the previously described species. Three species are here described as new: Motonerus explanatus sp. nov. (Panama), M. inca sp. nov. (Venezuela, Ecuador, Peru, Bolivia) and M. sofiae sp. nov. (Peru). New country records are provided for M. depressus Fikáček & Short (new for Venezuela, Ecuador, Peru and Bolivia), M. hanseni Fikáček & Short (new for Panama) and M. problematicus Fikáček & Short (new for Panama). An updated identification key and distributional maps are provided for all species, along with complete occurrence data in a DarwinCore formatted file. Potential distribution of the genus is modeled using the maximum entropy approach. Wing morphology is examined in detail, which revealed most species are macropterous, with M. andersoni Fikáček & Short being brachypterous, and M. apterus Fikáček & Short, M. oosternoides Fikáček & Short, and M. explanatus sp. nov. micropterous. The third instar of the putative larva of M. obscurus Hansen is briefly described based on larvae collected in association with adults.

• Klíčová slova
• Hydrophiloidea, Larval morphology, Species distribution modelling, Sphaeridiinae, Wing morphology,
• MeSH
• brouci klasifikace   MeSH
• křídla zvířecí anatomie a histologie   MeSH
• larva anatomie a histologie   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Bolívie MeSH
• Ekvádor MeSH
• Panama MeSH
• Peru MeSH
• Venezuela MeSH

Tharina gen. nov. along with T. antennalis (as type species), T. ecuadoriensis, T. micra, and T. peckorum spp. nov. (Coleoptera: Endomychidae: Endomychinae) from Venezuela, Ecuador, and Bolivia are described, diagnosed, and illustrated. Mouthpart structures, in this genus, which are unique within the family Endomychidae, are discussed in terms of their function. Notes on the unusual female genitalia in one species are provided.

• Klíčová slova
• Beetles, Bolivia, Coccinelloidea, Ecuador, Taxonomy, Tharina, Venezuela,
• MeSH
• brouci anatomie a histologie   klasifikace   MeSH
• ženské pohlavní orgány anatomie a histologie   MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Bolívie MeSH
• Ekvádor MeSH
• Venezuela MeSH