Cercyon Leach, 1817

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 : 2

Cercyon Leach, 1817

Cercyon Leach, 1817: 95 .

- Type species:Dermestes melanocephalus Linnaeus (designated by Thomson, 1859: 19).

Diagnosis. Small to medium sized beetles (1.0–6.0 mm in length). Body elongate oval in dorsal view, convex in lateral view ( Figs.1A and C ). Clypeus narrowing anteriorly, slightly convex, truncate to slightly arcuate apically. Antennae with nine antennomeres; compact club ( Figs. 1A and B , 2A ). Maxillar palpomere 2, swollen ( Fig.2A ). Prothorax with conspicuous antennal groove not reaching pronotal margin ( Fig.2B ); prosternum tectiform, carinate medially, medial part not demarcated from lateral parts ( Fig. 2B ). Elytra with 10 distinct longitudinal rows of punctures, forming fine striae ( Fig.1A ). Mesoventrite with posteromedial elevation forming an elongated oval plate, narrowing anteriorly and posteriorly, pointed or rounded posteriorly, not closely fused with metaventral elevation (touching anterior margin of metaventrite, in one short point) ( Fig. 2D ). Metaventrite with pentagonal median elevation, not projected between mesocoxae ( Fig. 2D ). Middle and hind legs with flattened tibiae and tarsus with tarsomere 1 longer than 2 ( Fig. 1B ). Abdomen with five ventrites; ventrite 1 carinate medially ( Fig. 3A ).

Figures

Figure 1. Cercyon curi sp. nov. Habitus, (A) dorsal view, (B) ventral view, (C) lateral view, scale = 1.0 mm.

Figure 2. Cercyon curi sp. nov. (A) head in dorsal view, scale = 0.5 mm; (B) head in frontal view and prosternum, scale = 0.25 mm; (C) pronotal disc and scutellum sculpture, scale = 0.2 mm; (D) mesoventral plate and metaventral elevation, scale = 0.25 mm.

Figure 3. Cercyon curi sp. nov. Abdomem,(A) abdominal ventrites,scale = 0.5 mm; terminalia (B–F), (B) sternite 9; aedeagus (C–F),(C) lateral view;(D) dorsal view;(E) Phallobase and parameres in dorsal view; (F) median lobe in dorsal view, scale = 0.2 mm.