Wedoquella apnnea sp. nov. and W. karadya sp. nov., two new species of the jumping spider subtribe Freyina are described and illustrated from specimens recently collected in Misiones and Chaco provinces, Northeastern Argentina. The new species are placed into a new group of Wedoquella because, although in body morphology they resemble the Phiale gratiosa group, the genital structures of both sexes more closely resemble those of Wedoquella, and a preliminary analysis based on mitochondrial COI sequences places this new group as sister to Wedoquella rather than to Phiale. Both new species are similar, but can be distinguished mainly by differences in the retrolateral tibial apophysis of the male palp. Females have a slight intraspecific color variation.

Wedoquella apnnea sp. nov. y W. karadya sp. nov., son descriptas e ilustradas a partir de especímenes colectados recientemente en las provincias de Misiones y Chaco, Nordeste de Argentina. Las nuevas especies se asemejan morfológicamente a las del grupo gratiosa de Phiale, sin embargo, son colocadas dentro de un nuevo grupo de Wedoquella debido a que las estructuras reproductoras de ambos sexos se asemejan más estrechamente a las de éste género, y un análisis preliminar basado en secuencias mitocondriales de COI ubica a este nuevo grupo como hermano de Wedoquella en lugar de Phiale. Ambas especies nuevas son similares, pero pueden distinguirse principalmente por diferencias en la apófisis retrolateral tibial del palpo masculino. Las hembras tienen una ligera variación intraespecífica de color.

In South America, yellow fever (YF) is an established infectious disease that has been identified outside of its traditional endemic areas, affecting human and nonhuman primate (NHP) populations. In the epidemics that occurred in Argentina between 2007-2009, several outbreaks affecting humans and howler monkeys (Alouatta spp) were reported, highlighting the importance of this disease in the context of conservation medicine and public health policies. Considering the lack of information about YF dynamics in New World NHP, our main goal was to apply modelling tools to better understand YF transmission dynamics among endangered brown howler monkey (Alouatta guariba clamitans) populations in northeastern Argentina. Two complementary modelling tools were used to evaluate brown howler population dynamics in the presence of the disease: Vortex, a stochastic demographic simulation model, and Outbreak, a stochastic disease epidemiology simulation. The baseline model of YF disease epidemiology predicted a very high probability of population decline over the next 100 years. We believe the modelling approach discussed here is a reasonable description of the disease and its effects on the howler monkey population and can be useful to support evidence-based decision-making to guide actions at a regional level.