We report two new exotic introduced isopods in Chile: Halophiloscia couchii of the family Halophilosciidae and Niambia capensis of the family Platyarthridae. This report provides first evidence of the presence of these species in the Southeastern Pacific. These species were found in several salt marshes and beaches spanning nearly 2000 km of the Chilean coast. With the data reported here, the percentage of exotic oniscidean isopods in Chile is 28%.

El Parque Nacional Bosque Fray Jorge, ubicado en la cordillera de la costa de la Región de Coquimbo, ocupa un área de clima mediterráneo árido con influencia marina, dominada por formaciones vegetacionales de matorral xerofítico, y con presencia de relictos boscosos asociados a las cimas expuestas a la neblina costera. En este trabajo se documenta la fauna de isópodos terrestres del Parque Nacional Bosque Fray Jorge, basándose en material obtenido durante dos campañas efectuadas en 2017. Las prospecciones fueron exitosas únicamente en microhábitats con presencia de humedad, tales como el supramareal rocoso, los bosques de neblina, aguadas y manantiales asociados a asentamientos humanos. Se registraron un total de 12 especies, distribuidas en 11 géneros y 9 familias, lo que constituye un aumento del 92% en la diversidad de la oniscofauna del área. El 50% de las especies encontradas corresponde a isópodos de origen exótico, mientras que de las especies nativas, al menos dos no estarían descritas. La especie exótica Haplophthalmus danicus es el primer representante de la familia Trichoniscidae conocido en Chile, mientras que Platyarthrus aiasensis y Trichorhina tomentosa corresponden a los primeros isópodos mirmecófilos para el país. Por otro lado, si bien Porcellionides pruinosus y Armadillidium vulgare ya habían sido citadas anteriormente en el país, éstas son las primeras localidades conocidas en Chile continental. Por último, la especie exótica Niambia capensis es citada por primera vez en áreas alejadas de la influencia marina. Entre los isópodos nativos, solo Chileoniscus marmoratus había sido registrado anteriormente en el parque. Sin embargo, se confirma la presencia de Benthanoides sp., Ligia novizelandiae y Tylos chilensis, especies que habían sido reportadas anteriormente en localidades hacia el norte y el sur del área de estudio. El registro de la familia Dubioniscidae requiere confirmación, ya que está basado en material incompleto. Este trabajo ha permitido agregar cinco especies a la oniscofauna chilena, con lo que la diversidad del grupo alcanzaría un total de 15 familias, 27 géneros y 50 especies en el país.

Using samples of talitrid amphipods collected on the coast of Chile, we describe two new monotypic genera characterized by particular types of sexual dimorphism, and we report the first record of the genus Platorchestia Bousfield, 1982 in the southeastern Pacific coast. In the subfamily Platorchestiinae, the genus Atacamorchestia gen. nov. and its new species Atacamorchestia atacamensis sp. nov. was collected in marine rocky coasts, in several localities in northern Chile. This new taxon is characterized principally by presence of T setae in male appendages, a feature shared with the genus Vallorchestia from Australia, but with a different distribution of these structures. The first specimens of Platorchestia in the Southeastern Pacific were obtained in Antofagasta, northern Chile, however they were identified only to genus level because a more in-depth taxonomic analysis will be necessary to determine their status. Finally, in the subfamily Talitrinae, Lafkenorchestia gen. nov. and its new species Lafkenorchestia oyarzuni sp. nov. were found on rocky marine shores and in estuaries in southern Chile, between La Araucania and Los Lagos regions. This new taxon is characterized by distinct modifications in basis and merus of male pereopod 7, showing some morphological similarities with the New Zealand genera Subantarctorchestia and Pictonorchestia. For each species, descriptions and illustrations are presented.

Hanseniella chilensis is the only myriapod of the class Symphyla known from Chile. This garden centipede, or pseudocentipede, was described more than 120 years ago based on morphologically incomplete specimens collected in central Chile, a well-known biodiversity hotspot. In this study, we redescribe this species based on morphologically complete specimens collected near the type locality using scanning electron microscope images. Our study provides the description of diagnostic characters hitherto unknown in this species such as macrochaetae of the tergites and spinnerets of the cerci. We also include a new record from central Chile and discuss the presumed presence of this species in Argentina and Madagascar.

A new species of amphipod of the family Ischyroceridae is described. Isaeopsis chiloensis n. sp. was discovered in association with the cancrid species Metacarcinus edwardsii and Romaleon setosum, in the inner sea around Chiloé Island, in Southern Chile. This represents the second species of the genus Isaeopsis, a group formerly known only from South African waters. The new species is characterized principally by the structure of the gnathopods, the propodus of pereopods 3–7 and the ornamentation of the outer ramus of uropod 3. The male gnathopod 2 has a prominent thumb in the posteroproximal margin of the propodus and the pereopods 3–7 are subchelate with the palm armed by a row of at least five strong setae. In addition, the apex of the outer ramus of uropod 3 bears a comb with more than thirty fine teeth. Isaeopsis chiloensis n. sp. is completely described and a series of illustrations is provided.