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We describe a new species of freshwater crab, Aegla chilota, from two small streams at Yaldad Bay, in the southern end of Chiloé Island, western Patagonia. The new taxon is distinguished from the remaining Chilean species of Aegla Leach, 1820 by the following morphological diagnostic features: rostrum neatly triangular, short, scarcely surpassing eyes; orbital sinus wide, shallow, limited by tiny extra-orbital spine and wide extra-orbital sinus; carpal lobe prominent, triangular, tipped by at least two coalescent acute conical scales; second abdominal epimeron little produced, armed with acute scale; telson plate roughly pentagonal, with functional median suture. Molecular phylogenetic analyses also support the separation and diagnosis of A. chilota from its sister taxon, A. hueicollensis Jara and Palacios, 1999. The type locality for A. chilota n. sp. is a small river that drains a small hilly orcid.org/0000-0002-2585-4657 orcid.org/0000-0001-5337-7985 orcid.org/0000-0002-0836-3389 oriGinal arTiCle This article is part of the special series offered by the Brazilian Crustacean Society in honor to Ludwig Buckup in recognition of his dedication and contributions to the development of Carcinology CORRESPONDING AUTHOR Marcos Pérez-Losada mlosada323@gmail.com SUBMITTED 04 July 2018 ACCEPTED 04 September 2018 PUBLISHED 03 December 2018 Guest Editors Alessandra A. de Pádua Bueno and Sandro Santos DOI 10.1590/2358-2936e2018029

Aegla chilota, new species of anomuran freshwater crab from Chiloé Island, western Patagonia