Stenoterommata quena is a species of mygalomorph spiders of Argentina, named after its type locality: La Quena, Salta Province. Females are recognized by the numerous spines on prolateral patella III. The rastellum is stronger, and the maxillae are shorter, than in other species of its genus. The presence of preening combs in metatarsi I is also unusual.
Stenoterommata tenuistyla is a species of mygalomorph spiders of Argentina, named after the thin, slender embolus in males of this species, which distinguish it from males of the sympatric S. crassistyla. Females are distinguished from other three-clawed Stenoterommata by their spermathecae, which have a short basal portion and a single receptaculum arising from near the tip of the base. Males are diagnosed by one of the species autapomorphies: the presence of numerous short spines on the ventral metatarsus I.
Stenoterommata palmar is a mygalomorph spider of Argentina, named after its type locality: Parque Nacional El Palmar, Entre Rios. Females differ from other three-clawed Stenoterommata in the spermathecae having one triangular dome with a single receptaculum arising from its base; males are most similar to those of S. tenuistyla, but lack short ventral spines on the metatarsus I, and have a long, curved spine on the apical third of their ventral tibia I. Its burrowing behaviour is similar to that of S. tenuistyla.
Acanthogonatus confusus is a mygalomorph spider of Argentina and Chile, its name referring to the confusion between this species and A. subcalpeianus. Males are recognized by their long palpi, together with the absence of a tibial apophysis; females are recognized by the spermathecae.
Acanthogonatus huaquen is a mygalomorph spider of Chile, its name referring to its type locality: Huaquén, Chile. Males are recognized from other two-clawed Acanthogonatus by the bulb with a lateral keel delimiting a concave area; females by the spermathecae with an almost conical basal mound and its duct arising from its tip.
Acanthogonatus quilocura is a mygalomorph spider of Chile, its name referring to the seemingly unending number of species within this genus. Males are similar to those of A. tacuariensis, from which are distinguished by a curved metatarsus I; female spermathecae are characteristic in having a strongly bent duct arising from the base of a blunt basal dome.
Acanthogonatus juncal is a mygalomorph spider of Argentina and Chile, named after its type locality: Juncal, Los.
Acanthogonatus parana is a mygalomorph spider of Argentina, its name referring to its type locality: Paraná, Entre Ríos. Females are most similar to those of A. centralis, but are distinguished by the narrow fundus of the spermathecae.
Acanthogonatus recinto is a mygalomorph spider of Chile, its name arising from its type locality: Recinto, Nuble, Region VIII, Chile. Females are distinguished from those of A. franki by the spermathecae, having a more rounded and differentiated fundus and its basal portion extended internally, compared to those of A. peniasco with a narrower, longer and less sclerotized ducts; and from other species in the genus by having 1-1-1 P spines on its patella IV. Males differ from those of A.franki in the unique winglike projection at the base of the embolus.
Acanthogonatus peniasco is a mygalomorph spider of Chile, its name arising from its type locality: El Peñasco, Linares, VII Region, Chile. Females differ from those of A. franki and A. recinto in the shorter, wider, and more sclerotized spermathecal ducts, and from those of other species in the genus by having 1-1-1 P spines in the patella IV.
Acanthogonatus birabeni is a mygalomorph spider of Argentina, named after Max Birabén, an Argentinian arachnologist. It differs from others in the patagonicus group by its smaller size and by the less developed bulb keels.
Acanthogonatus nahuelbuta is a mygalomorph spider of Chile, named after its type locality: Piedra del Águila, Parque Nacional Nahuel-Buta, Malleco. Males differ from A. patagallina by having the basal portion of the bulb less rounded and the basal loop of the bulbal duct less sinuous; and from those of A. hualpen by the differently shaped embolus and the palpal tibia with the apical two-thirds tapering gradually and having thickened setae.
Acanthogonatus hualpen is a mygalomorph spider of Chile, named after its type locality: Hualpén, Concepción, Bío Bío Region. Males can be distinguished from those of A. nahuelbuta and A. patagallina by the shaped of the bulb's apex, and by the palpal tibia being wide in the basal two-thirds with thickened setae along the apical one-third of the retrolateral face.
Acanthogonatus vilches is a mygalomorph spider of Chile, named after its type locality: Gil de Vilches, Talca, Region VII. Females differ from other species in the nahuelbuta group by their less modified spermathecae.
Chilelopsis minima is a species of mygalomorph spiders found in Chile. It formerly belonged in the genus Flamencopsis. The specific name was given because it is the smallest member of the tribe Diplothelopsini.
Chilelopsis serena is a species of mygalomorph spiders of Chile, named after its type locality: La Serena, Elqui, Region IV. Males differ from those both C. calderoni and C. puertoviejo in the absence of a patch of setae on the apical tibia I, and also in the palpal tibia having dorsal spines and the bulbal duct being abruptly narrowed at the apex. Females differ from the two other species by their divided spermathecae.
Chilelopsis puertoviejo is a species of mygalomorph spiders of Chile, named after its type locality: Puerto Viejo, Copiapó, Region III. The species is most similar to C. calderoni, but differs in having the distal portion of the male bulbal duct less sinuous and the female spermathecae of uniform width, with no differentiated fundus. It differs from C. serena in the undivided female spermathecae and the male tibia I having a dense apical patch of setae.
Lycinus tofo is a mygalomorph spider of Chile, named after its type locality: El Tofo, Coquimbo Region. Males are distinguished by the palpal bulb, more abruptly tapered than in other species of the genus; females by the long, slender, spiraled spermathecal receptacula.
Chaco tucumana is a species of mygalomorph spiders of Argentina, named after its type locality: Tucumán. This species differs from C. obscura in the shorter male embolus and the shorter female spermathecal ducts. From other species of the genus it differs in its dark uniform color, the flexible anterior female tarsi, the denser scopulae on the posterior tarsi, and the female spermathecae without a basal protuberance. As in C. obscura, smaller specimens are much lighter in color, and it has darker spots that are evident on the sides of its cephalic region, the apex of femora, base of the patellae and lateral tibiae and dorsal abdomen. Larger specimens are much darker, almost black, with no visible pattern.
Chaco tecka is a species of mygalomorph spiders of Argentina, named after its type locality: Rio Tecka, Chubut, Argentina. Females can be distinguished from those of other species of Chaco by the strong and numerous spines on metatarsus IV and by the presence of pseudopreening combs on metatarsi III and IV. From C. patagonica and C. sanjuanina, females differ also in the patterned cephalothorax and legs.
