Population density estimates and conservation status of Aegla jacutinga Marçal & Teixeira, 2020 (Decapoda: Anomura: Aeglidae) from the type locality in Brazil.

This article focuses on the population density, distribution, and conservation status of *Aegla jacutinga*, a freshwater crab species endemic to southern Brazil. Using the Schumacher-Eschmeyer method, researchers estimated a high population density of 8.51 individuals per square meter in the species' type locality within the Tibagi River basin, where riparian forest cover meets environmental protection standards. The species was found in 12 locations but faces threats from habitat fragmentation, agricultural runoff, and pesticide use, leading to its classification as Endangered under the International Union for Conservation of Nature (IUCN) criterion B1ab(iii). The study highlights the species' vulnerability due to limited dispersal, environmental sensitivity, and ongoing habitat degradation, emphasizing the need for targeted conservation and monitoring efforts in its fragmented habitats.