Photinopygus hilaris ( Erichson, 1839 )

Chatzimanolis, Stylianos, 2023, A revision of the genus Photinopygus Chatzimanolis (Staphylinidae: Xanthopygina), Zootaxa 5292 (1), pp. 1-100 : 56-58

Photinopygus hilaris ( Erichson, 1839)

( Figs. 131–138 )

Staphylinus hilaris Erichson, 1839: 365 .

Xanthopygus hilaris (Erichson) ; Kraatz 1857: 539.

Photinopygus hilaris (Erichson) ; Chatzimanolis 2021: 91.

Type material. Lectotype, here designated, female, with labels: “5907” / “Type” / “Hist. -Coll. ( Coleoptera ) Nr. 5907. Staphylinus hilaris Erichs. Cayenne, Boquet, Zool. Mus. Berlin ” / “ hilaris Er. Cayenne Buq. ” / “ Syntype Staphylinus hilaris Erichson, 1839 labelled by MFNB 2020” / “ Lectotype Staphylinus hilaris Erichson des. Chatzimanolis 2022 ”. In the collection of MFNB.

Additional Materials. BRAZIL: São Paolo: unknown locality, Griveau coll. (1 ♀ MHNG) ; FRENCH GUIANA: Charvein [5.570°, -53.90°] (1 ♁ MHNG) ; Réserve Trésor [4.610°, -52.279°], cca 225 m, xi.2009, window trap, S. Brulé leg. (1 ♀ NHMUK) ; Saint-Laurent-du-Maroni [5.50°, -54.03°], Fauvel coll., Griveau coll. (1 ♁ MHNG); 27.4 km SSE Roura [4.74°, -52.22°], 280 m, 10.vi.1997, FIT, J. Ashe, R. Brooks leg., SM0133934 (1 ♀ SEMC) ; Saül, 7 km N and 1 km NW Les Eaux Claires, along Rue de Belizon trail [3.66°, -53.22°], 280 m, 4–8.vi.1997, FIT, J. Ashe, R. Brooks leg., SM0098918 (1 ♀ SEMC) ; same locality, 220–240 m, 31.v.–3.vi.1997, FIT, J. Ashe, R. Brooks leg., SM0099440 (1 ♀ SEMC) ; SURINAME: Paramaribo: Paramaribo [5.85°, -55.20°], S.V. Heller leg. (1 ♁ MFNB) .

Diagnosis. Photinopygus hilaris belongs in the convex pronotum species group. Among species of that group, P. hilaris can be recognized by the following combination of characters: tergite 5 with complete curved carina (arch-like; Fig. 131 ), antennomeres 8–10 transverse ( Fig. 134 ), sternite 8 with small U-shaped emargination posteriorly ( Fig. 132 ), and aedeagus as in Figs. 135–137 . Additionally, antennomeres 5–8 (at minimum, in some specimens 4–9) are dark brown. However, the coloration of the antennae is not always a reliable character.

Description. Forebody ( Fig. 131 ) length 5.7–7.5 mm. Color of head, pronotum and mesoscutellum dark brown to black; antennomeres 1–4, 11 orange, 5–10 dark brown; legs dark brown to black except protarsi dark orange (in some specimens meso-, metatarsi light brown); elytra metallic blue with green or purple overtones; abdomen dark brown to black except segments 7–8 (orange). Antenna ( Fig. 134 ) with antennomere 3 without tomentose pubescence; antennomere 4 with tomentose pubescence; antennomeres 4–5 longer than wide; antennomere 6–7 subquadrate; antennomeres 8–10 transverse. Head transverse; HW/HL ratio = 1.33–1.41. Posterior margin of head slightly extended posteriad on each side of neck. Head with medium-sized punctures, distance between punctures as wide as 1–2 punctures but punctures denser posteriorly. Left mandible with bicuspid tooth. Pronotum ( Fig. 133 ) subquadrate; PW/PL ratio = 1.05–1.11. Lateral margins of pronotum in dorsal view posteriad of midpoint convex; pronotum with 7–8 sparse rows of punctures on each half beside median impunctate line; distance between punctures as wide as 1–2 punctures but areas of pronotum without punctures. EL/PL ratio = 1.45–1.52. Elytra with dense punctation; distance between punctures as wide as 0–0.5 punctures. Metepisternum covered with punctures (impunctate area less than 1/3). Abdomen with tergite 3 having setose punctures only on posterior margin; tergite 4 setose; tergites 3–5 with curved carina (arch-like). In males, sternite 7 without porose structure, sternite 7 with shallow and broad emargination posteriorly; sternite 8 with small U-shaped emargination posteriorly, emargination with ‘shaved’ margin ( Fig. 122 ). Aedeagus as in Figs. 135–137 ; in dorsal view paramere converging to rounded apex; paramere shorter and slightly narrower (except apically) than median lobe; in lateral view paramere becoming narrower near tip; paramere with peg setae in multiple lateral rows as in Fig. 137 . Median lobe in dorsal view converging to narrow pointed tip; in lateral view median lobe becoming narrower; median lobe with large subapical tooth.

Distribution. Known from the Boreal Brazilian and Paraná biogeographic dominions. Distributed in the state of São Paolo in Brazil; from French Guiana, and from the district of Paramaribo in Suriname. The specimen from São Paulo may be mislabeled. Map is shown in Fig. 138 .

Habitat. Collected at low elevation (220–280 m) using flight intercept traps.

Figures

FIGURE 138. Distribution map of Photinopygus hilaris (Erichson) (triangles), P. janthinipennis (Blanchard) (square), and P. iopterus (Erichson) (circles).

FIGURES 131–134. Photinopygus hilaris (Erichson). 131. Habitus. 132. Sternites 7–8. 133. Pronotum. 134. Antenna. Not to scale.

FIGURES 135–137. Aedeagus of Photinopygus hilaris (Erichson). 135. Lateral view. 136. Dorsal view. 137. Detail of paramere, ventral view.

FIGURES 120–123. Aedeagus of Photinopygus faustus (Erichson).120. Lateral view.121. Dorsalview. 122.Detail of paramere, ventral view. 123. Detail of the tip of median lobe, oblique view.