Photinopygus janthinipennis ( Blanchard, 1842 )

Chatzimanolis, Stylianos, 2023, A revision of the genus Photinopygus Chatzimanolis (Staphylinidae: Xanthopygina), Zootaxa 5292 (1), pp. 1-100 : 62-64

Photinopygus janthinipennis ( Blanchard, 1842)

( Figs. 138 , 146–152 )

Staphylinus janthinipennis Blanchard, 1842: 78 .

Xanthopygus janthinipennis (Blanchard) ; Fauvel 1869: 487.

Photinopygus janthinipennis (Blanchard) ; Chatzimanolis 2021: 91.

Type material. Lectotype, here designated, female, with labels: “[green round label 7051 34” / “ Lectotype S. janthinipennis Blanchard des. Chatzimanolis 2022 ”. In the collection of MNHN. The type locality (not mentioned on the label) is Santa-Ana de Chiquitos [Santa Ana de Velasco, -16.58°, -60.69°] in Bolivia. There is a second specimen in the collection, perhaps in the type series, but that specimen belongs to the genus Zackfalinus Chatzimanolis.

Additional Materials. BRAZIL: Bahia: unknown locality, Cameron coll. (1 ♁, 2 ♀ NHMUK) ; Espírito Santo: unknown locality, Cameron coll. (1 ♀ NHMUK) ; Rio Grande do Sul: unknown locality, Cameron coll. (1 ♀ NHMUK) .

Diagnosis. Photinopygus janthinipennis belongs in the concave pronotum species group. Among species of that group that have pronotum with dense punctation (i.e., with 5–9 organized rows of punctures on each half beside median impunctate line), antennomeres 4–5 longer than wide, and sternite 7 in males with porose structure, P. janthinipennis can be recognized by the following combination of characters: pronotum with 8–9 dense rows of punctures on each half beside median impunctate line ( Fig. 148 ); antennae with antennomeres 4–8 darker in color (coloration consistent among specimens); sternite 8 in males with large deep U-shaped emargination posteriorly ( Fig. 147 ), sternite 7 in males with narrow, deep but not ‘shaved’ emargination posteriorly ( Fig. 147 ), antennomeres 8–10 subquadrate ( Fig. 149 ), aedeagus with paramere subequal to median lobe ( Fig. 150 ), paramere in lateral view expanding before becoming narrower and concave near tip ( Fig. 150 ).

Description. Forebody ( Fig. 146 ) length 6.6–7.2 mm. Color of head, pronotum and mesoscutellum dark brown to black; antennae orange but antennomeres 4–8 darker; 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 posterior half of sternite 7 and sternite orange. Antenna ( Fig. 149 ) with antennomere 3 without tomentose pubescence; antennomere 4 with tomentose pubescence; antennomeres 4–6 longer than wide; antennomeres 7–10 subquadrate. Head transverse; HW/HL ratio = 1.57–1.64. 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. 148 ) subquadrate; PW/PL ratio = 1–1.04. Lateral margins of pronotum in dorsal view posteriad of midpoint concave; pronotum with 8–9 dense rows of punctures on each half beside median impunctate line; distance between punctures as wide as 0.5–1 punctures but areas of pronotum without punctures. EL/PL ratio = 1.26–1.38. 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 tergites 3–4 setose; tergites 3–5 with curved carina (arch-like); sternite 7 with large porose structure, sternite 7 with narrow and deep emargination posteriorly; sternite 8 with large U-shaped emargination posteriorly ( Fig. 147 ). Aedeagus as in Figs. 150–152 ; in dorsal view paramere converging to rounded apex; paramere subequal and slightly narrower (except apically) than median lobe; in lateral view paramere slightly expanding before becoming narrower and concave near tip; paramere with peg setae in multiple lateral rows as in Fig. 152 . Median lobe in dorsal view converging to narrow pointed tip; in lateral view median lobe becoming narrower; median lobe with small subapical tooth.

Distribution. Known from the Chacoan and Paraná biogeographic dominions. Distributed in the states of Bahia, Espírito Santo and Rio Grande do Sul in Brazil, and from the department of Santa Cruz in Bolivia. Map is shown in Fig. 138 .

Habitat. Unknown but the type locality is at a lowland elevation.

Figures

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

FIGURES 146–149. Photinopygus janthinipennis (Blanchard). 146. Habitus. 147. Sternites 7–8. 148. Pronotum. 149. Antenna. Not to scale.

FIGURES 150–152. Aedeagus of Photinopygus janthinipennis (Blanchard). 150. Lateral view. 151. Dorsal view. 152. Detail of paramere, ventral view.