Circoniscus ornatus (Verhoeff, 1941)

Ocampo-Maceda, Ana Teresa, Ruelas-Cabana, Carlos Miguel, López-Orozco, Carlos Mario & López-Tejeda, Evaristo Luciano, 2022, Catalogue of terrestrial isopods (Isopoda, Oniscidea) from Peru, with new records of Circoniscus ornatus (Scleropactidae) and Ethelum americanum (Eubelidae), Nauplius (e 2022003) 30, pp. 1-12 : 7

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.

Figures

Figure 2. Photos of the habitats in the collection sites: A, Meandric floodplain (Nueva Alianza); B, low hill forest (Nuevo Sucre). Microhabitats: C, Philander sp. skull; D, decayed termite nests; E, F, rotten logs.

Figure 3. Habitus in lateral view of: A, Circoniscus ornatus (Verhoeff, 1941); B, Ethelum americanum (Dollfus, 1896).