Five new species of the long-jawed orb-weaving spider genus Tetragnatha (Araneae, Tetragnathidae) in South America, with a key to the species from Argentina and Brazil

Five new species in the long-jawed orb-weaving spider genus Tetragnatha Latreille, 1804 are described from South America: amazonica sp. nov. (Venezuela); T. cristata (Argentina and Brazil); didorata (Brazil); oncognatha pradoi Brazil). A key to 21 of Argentina Brazil is provided, completing revision for these countries. The female cladognatha Bertkau, 1880 redescribed a neotype proposed, its male first time. Additionally, we update taxonomic status following six American species: labialis Nicolet, 1849 americana Simon, 1896 considered junior synonymies nitens (Audouin, 1826); bishopi Caporiacco, 1947, linearis 1849, similis sternalis proposed as nomina dubia due missing or juvenile type-material.