Shedding light into Brazilian subterranean isopods (Isopoda, Oniscidea): expanding distribution data and describing new taxa Author Campos-Filho, Ivanklin Soares Author Sfenthourakis, Spyros Biodiversity and ecology laboratory, Department of Biological Sciences, University of Cyprus, Lefkosia (Nicosia) (Cyprus) ivanklin. filho @ gmail. com, isoare 01 @ ucy. ac. cy (corresponding author) Author Gallo, Jéssica Scaglione Author Gallão, Jonas Eduardo Author Torres, Dayana Ferreira Laboratório de Estudos Subterrâneos, Universidade Federal de São Carlos, São Carlos, São Paulo (Brazil) and Instituto Brasileiro de Estudos Subterrâneos, São Paulo (Brazil) Author Chagas-Jr, Amazonas Departamento de Biologia e Zoologia, Universidade Federal de Mato Grosso, Instituto de Biociências, Cuiabá, Mato Grosso (Brazil) Author Horta, Lília Grupo Bambuí de Pesquisas Espeleológicas, Belo Horizonte, Minas Gerais (Brazil) Author Carpio-Díaz, Yesenia Margarita Author López-Orozco, Carlos Mario Author Borja-Arrieta, Ricardo Grupo de Investigación en Biología Descriptiva y Aplicada, Programa de Biología, Universidad de Cartagena, Campus San Pablo, Cartagena de Indias (Colombia) Author Araujo, Paula Beatriz Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul (Brazil) Author Taiti, Stefano Istituto di Ricerca sugli Ecosistemi Terrestri, Consiglio Nazionale delle Ricerche, Sesto Fiorentino, Firenze (Italy) and Museo di Storia Naturale, Sezione di Zoologia “ La Specola ”, Firenze (Italy) Author Bichuette, Maria Elina Laboratório de Estudos Subterrâneos, Universidade Federal de São Carlos, São Carlos, São Paulo (Brazil) and Grupo Bambuí de Pesquisas Espeleológicas, Belo Horizonte, Minas Gerais (Brazil) and Instituto Brasileiro de Estudos Subterrâneos, São Paulo (Brazil) text Zoosystema 2023 2023-10-18 45 19 531 599 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2023v45a19.pdf journal article 10.5252/zoosystema2023v45a19 1638-9387 49E49578-3EC4-4088-B17E-E3387C70C247 Genus Circoniscus Pearse, 1917 Circoniscus Pearse, 1917: 4 . TYPE SPECIES . — Circoniscus gaigei Pearse, 1917 , by monotypy (see Schmidt & Leistikow 2004 ). DIAGNOSIS . — After Schmidt (2007) : animals with endoantennal conglobation; roller habitus ( sensu Schmalfuss 1984 ); dorsal surface smooth bearing small scale-setae; pereonites 1-7 with one line of short noduli laterales inserted at same line and near posterior margins; cephalon with wide frontal shield, sometimes projecting backwards over vertex, eyes composed of many ommatidia (absent in troglobionts); pereonite 1 epimera with posterior schisma, pereonite 2 and 3 epimera with ventral lobe or simple; pleon outline continuous with that of pereonite 7; telson triangular with broad rounded apex not covering uropod endopods; antennula of three articles; antennal flagellum of two subequal articles (sometimes distal article slightly longer), apical organ subequal or longer than distal article of flagellum; mandibles with molar penicil dichotomized, left mandible with 2+1 penicils, righ mandible with 1+1 penicils; maxillula outer endite with 4+5-6 teeth, outer set bearing four or five teeth apically cleft, accessory tooth and slender seta between outer and inner sets; maxilla bilobate; maxilliped endite bearing one penicil; pereopods 1-7 merus and carpus bearing scales on sternal margins (sometimes wide and dense); pereiopod 1 carpus with transverse antenna-grooming brush (sometimes wide); pereopod 7 basis with vestigial water-conducting scale-rows, ischium and/or merus sometimes sexually dimorphic; dactylar seta simple or hirsute, ungual seta simple; uropod protopod subrectangular and flattened; pleopod 1 and 2 exopods with respiratory areas; male pleopod 1 endopod tip bent outwards; male pleopod 5 exopod triangular with distal portion elongated.