Catalogue of terrestrial isopods (Isopoda, Oniscidea) from Peru, with new records of Circoniscus ornatus (Scleropactidae) and Ethelum americanum (Eubelidae) Author Ocampo-Maceda, Ana Teresa Universidad Nacional de San Agustín de Arequipa, Museo de Historia Natural. & @ unicartagena. edu. co Author Ruelas-Cabana, Carlos Miguel Universidad Nacional de San Agustín de Arequipa, Museo de Historia Natural. & @ unicartagena. edu. co Author López-Orozco, Carlos Mario Universidad de Cartagena, Grupo de Investigación Hidrobiología, Programa de Biología. Campus San Pablo, Barrio Zaragocilla, Cartagena de Indias, Colombia. E-mail: clopezo Author López-Tejeda, Evaristo Luciano Universidad Nacional de San Agustín de Arequipa, Museo de Historia Natural. & @ unicartagena. edu. co text Nauplius 2022 e 2022003 2022-03-21 30 1 12 journal article 10.1590/2358-2936e 2358-2936 10716602 DD66D5C5-F00A-412C-94DD-4DC72AED24FD 19. Circoniscus ornatus (Verhoeff, 1941) Fig. 3A Parcirconiscus ornatus Verhoeff, 1941b , 169, figs. 1–9. Circoniscus gaigei — Schmalfuss, 1980b: 4 . — Leistikow and Wägele, 1999: 38 . — Schmalfuss, 2003: 81. Circoniscus ornatus — Schmidt,2007:68 ,figs.209–216. Material examined . 24♀ , 9♂ , 39 mancas (MUSA-ENT-ISO 001), Nueva Alianza , Contamana , Loreto , 7°24ʹ49.95ʺS 74°57ʹ43.44ʺW , November 2019 , leg. A. Ocampo and C. Ruelas ; 65♀ , 13♂ ,12 mancas(MUSA-ENT-ISO 002), 7°24ʹ37.81ʺS 74°57ʹ42.69ʺW , same data as previous ; 6♀ , 6♂ , 2 mancas (MUSA-ENT-ISO 003), 7°24ʹ38.52ʺS 74°57ʹ54.92ʺW , same data as previous ; 24♀ , 12♂ , 8 mancas (MUSA-ENT-ISO 004), 7°24ʹ52.53ʺS 74°58ʹ1.68ʺ W , same data as previous ; 12♀ , 8♂ , 4 mancas (MUSA-ENT-ISO 005), 7°24ʹ47.90ʺS 74°57ʹ52.70ʺW , same data as previous ; 14 ♀ , 1♂ (MUSA-ENT-ISO 006), 7°24ʹ31.72ʺS 74°57ʹ46.08ʺW , same data as previous ; 18♀ , 1♂ (MUSA-ENT-ISO 007), Nuevo Sucre , Contamana , Loreto , 7°24ʹ47.21ʺS 74°56ʹ8.51ʺW , same data as previous ; 91♀ , 29♂ , 34 mancas (MUSA-ENT-ISO 008), 7°25ʹ1.24ʺS 74°56ʹ5.76ʺW , same data as previous ; 2♀ , 1 manca (MUSA-ENT-ISO 009), 7°25ʹ18.21ʺS 74°56ʹ19.50ʺW , same data as previous . Distribution . Guyana , Surinam , and Brazil ( Amapá , Amazonas, and Pará States) ( Schmidt, 2007 ; Boyko et al ., 2008a ; Campos-Filho et al ., 2018 ). It is recorded in Peru from the department of Huánuco , Panguana Biological Station ( Schmalfuss, 1980b ; Leistikow and Wägele, 1999 ; Schmalfuss, 2003 ; Schmidt, 2007 ; Boyko et al ., 2008a ). The present article extends the knowledge of its distribution to the department of Loreto , in the buffer zone of the Cordillera Azul National Park (Nueva Alianza) and the locality of Nuevo Sucre. Ecological remarks . Specimens were collected from inside a marsupial’s skull ( Philander sp. ); decayed termite nests on the leaf litter, a few of them with some termites present; in cavities inside rotten logs and also under the bark of trees, all located in Nueva Alianza ( Fig. 2C–E .). In Nuevo Sucre locality, C . ornatus was observed under pseudostem of decayed banana plants and inside rotten logs ( Fig. 2F ). The isopods shared the microhabitats with ants, termites, roaches, millipedes, centipedes, spiders, mosquitoes, and frogs.