Cercyon (Cercyon) inquinatus Wollaston, 1854

Clarkson, Bruno, Mise, Kleber M. & Almeida, Lucia M., 2020, Cercyon Leach, 1817 (Coleoptera: Hydrophilidae: Sphaeridiinae) from Brazil: new species and records, Revista Brasileira de Entomologia (e 201972) 64 (1), pp. 1-8 : 6

Cercyon (Cercyon) inquinatus Wollaston, 1854

Cercyon inquinatum Wollaston, 1854: 103 .

Cercyon inquinitum Wollaston; Wollaston, 1864: 94 .

= Cercyon (s.str.) knischi Müller, 1924: 77 (synonymized by d’Orchymont, 1940: 45).

= Cercyon gebieni Knisch, 1925: 202 (synonymized by Smetana, 1979: 961)

= Cercyon (Clinocercyon) faeceus Balfour-Browne, 1954: 230 (synonymized by Smetana, 1979: 961).

= Cercyon austriacus Vogt, 1974: 190 (synonymized by Hofmann & Flechtner, 2003: 225)

= Cercyon rhombicus Jia, 1995: 18 (synonymized by Ryndevich, 2004: 9)

For complete synonymy see Smetana (1979), Hansen (1999) and Ryndevich (2004).

Material examined: BRAZIL: Amazonas: Manaus: “Brasil – AM, Manaus/ Reserva Adolpho Ducke / 11/VII/2008 / K.M.Mise (Leg.)// Coleta manual/ Isca carcaça suína// Cercyon (Cercyon) / inquinatus / Wollaston, 1854 / Clarkson det. 2018” (1 female: DZUP) .

Discussion. This is an adventive species currently distributed in all zoogeographical regions, which was described based on specimens from Madeira Island in Portugal and your synonyms: Cercyon (Cercyon) knischi Müller, 1924 , were described based on specimens from Croatia (Dalmatia, Zadar) and Italy (Trieste, San Giovanni and Sicily); Cercyon (Cercyon) gebieni Knisch, 1925 from Indonesia (Java); Cercyon (Clinocercyon) faeceus Balfour-Browne, 1954 from Mascarene Islands and Mauritius; Cercyon austriacus Vogt, 1974 from Austria; and Cercyon rhombicus Jia, 1995 from China (Guangdong). There is no assurance on its primary provenance ( Hansen, 1999). In Neotropical Region the species was solely recorded in Rio de Janeiro State, Brazil until up to date ( Fauvel, 1903). The species is herein recorded for the first time in Amazon forest area of Amazonia State (Northern Brazil) enlarging our knowledge on the distribution of this species since in the New World the species is recorded only in U.S.A. ( Smetana, 1978) besides Brazil ( Fig. 4 ). The examined specimen is a female and was recognized based on external characters such as the small size (body length 2.0– 2.7 mm); body shape rather strongly convex and broadly oval; dark-brown dorsal coloration; dorsal surface with extremely fine, sparse, decumbent pubescence; ninth elytral stria present as distinct row of coarse punctures; and lateral portions of metaventrite with fine and rather sparse, shallow, pit-like punctures. The easiest way to identify the species is with the examination of the aedeagus. For more detailed information on the morphology and illustrations of the species see Smetana (1979).

Bionomics. The examined specimen was collected in pig carcass in a controlled forensic experiment of entomological succession during the putrefaction stage ( Mise et al., 2010). The species is known as terrestrial and are usually found inhabiting all kinds of decaying organic matter as rotting debris on sea beaches, debris at the edges of ponds, rotting leaf litter and decaying fruits, cave guano, etc. ( Smetana, 1979; Ryndevich, 2007).

Figures

Figure 4. Map with the known distribution of Cercyon curi sp. nov., Cercyon inquinatus Wollaston,1854, Cercyon nigriceps (Marsham,1802) and Cercyon (Cercyon) praetextatus (Say, 1825) in South America based on d’Orchymont (1939), Fikáček (2009) and the current work. White square highlights the region of Paraná State where most part of the examined specimens is from.