Nauplius THE JOURNAL OF THE BRAZILIAN CRUSTACEAN SOCIETY e-ISSN 2358-2936 www.scielo.br/nau www.crustacea.org.br 1 ORIGINAL ARTICLE Nauplius, 25: e2017008 s ETY s E CORRESPONDING AUTHOR Felipe Bezerra Ribeiro fbribeiro.ufc@gmail.com SUBMITTED 17 October 2016 ACCEPTED 28 november 2016 PUBLISHED 27 Abril 2017 Guest Editor Célio Magalhães DOI 10.1590/2358-2936e2017008 This article is part of the tribute offered by the Brazilian Crustacean Society in memoriam of Michael Türkay for his outstanding contribution to Carcinology A new species of Parastacus Huxley, 1879 (Crustacea, Decapoda, Parastacidae) from a swamp forest in southern Brazil Felipe Bezerra Ribeiro 1 , Augusto Frederico Huber 1 , Christoph D. Schubart 2 and Paula Beatriz Araujo 1 1 Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia (Laboratório de Carcinologia), Instituto de Biociências, Universidade Federal do Rio Grande do Sul. Porto Alegre, Rio Grande do Sul, Brazil 2 Zoology and Evolutionary Biology, Universität Regensburg. Regensburg, Germany ZOOBANK htp://zoobank.org/urn:lsid:zoobank.org:pub:E302E7F9-0594-40EE- B179-D7F8A68A19A9 ABSTRACT In this contribution we describe a new species of burrowing crayish of the genus Parastacus Huxley, 1879 from a swamp forest in southern Brazil and determine its conservation status. he distinction of the new species is based on morphology and the mitochondrial DNA marker 16S rRNA. he extinction risk was assessed according to the sub-criterion B1 of IUCN that estimates the Extent of Occurrence (EOO). Parastacus tuerkayi sp. nov. is morphologically distinguishable from all species of Parastacus by having three lines of verrucous tubercles on the dorsomesial margin of the cheliped propodus and a suborbital angle exceeding 90°. he EOO comprises 647,674 km², and the species is classiied as “endangered”. Phylogenetic relationships indicate the distinct position of this new species in relation to the already described species. KEY WORDS 16S, mtDNA sequence, burrowing crayish, Neotropical region, taxonomy .