Notolathrus sensitivus holds the distinction of being the first cave-restricted planthopper species documented in South America, and currently stands as the sole known troglobitic Fulgoromorpha species in Argentina. This paper presents a comprehensive supplementary description of N. sensitivus, incorporating newly collected male and female specimens. Notably, this study provides the first-ever description of females for this species. In addition to photographs of structural details, we include images showcasing live specimens within their natural habitat. Furthermore, we highlight the primary threats that pose risks to the species’ survival. Based on these significant findings, we strongly advocate for the inclusion of N. sensitivus on the Argentine endangered species list, emphasizing the urgent need for conservation measures.