Photinopygus dimidiatus ( Bernhauer, 1917 )

Chatzimanolis, Stylianos, 2023, A revision of the genus Photinopygus Chatzimanolis (Staphylinidae: Xanthopygina), Zootaxa 5292 (1), pp. 1-100 : 48-50

Photinopygus dimidiatus ( Bernhauer, 1917)

( Figs. 22 , 109–115 )

Xanthopygus dimidiatus Bernhauer, 1917: 23 .

Photinopygus dimidiatus (Bernhauer) ; Chatzimanolis 2021: 91. Type material. Lectotype, here designated, male with labels: “Yuracaris [Yuracares]” / “ Bolivien ” / “A. Fauvel” / “[blue square label]” / “ dimidiatus Bernh. Typus Mus. Hamburg” / “Chicago NHMus M. Bernhauer collection” / “FMNHINS3975352” / “ Lectotype Xanthopygus dimidiatus Bernhauer des. Chatzimanolis 2022 ”. In the collection of FMNH. Paralectotype, here designated, female with labels: “ Bolivia, A. Fauvel” / “[blue square label]” / “ dimidiatus Bernh. Cotypus Mus. Hamburg” / “Chicago NHMus M. Bernhauer collection” / “FMNHINS3975353” / “ Paralectotype Xanthopygus dimidiatus Bernhauer des. Chatzimanolis 2022 ”. In the collection of FMNH.

Additional Materials. BOLIVIA: Cochabamba: Yungas del Palmar [-17.13°, -65.50°], 1000 m, 2.v.1948, R. Zischka leg., Scheerpeltz coll. (2 ♀ MNW) ; unknown department: unknown locality, Sharp coll., Bernhauer coll., FMNHINS3975354 (1 ♀ FMNH) ; unknown locality, Sharp coll. (2 ♁, 2 ♀ NHMUK) .

Diagnosis. Photinopygus dimidiatus belongs in the narrow pronotum species group. Photinopygus alloportokalis , P. dimidiatus and P. rufipennis can be distinguished from all other species in Photinopygus due to the presence of orange elytra. Photinopygus dimidiatus and P. rufipennis can be distinguished from P. alloportokalis by the orange mesoscutellum (dark brown to black in P. alloportokalis ), and the shape of the median lobe: in lateral view with a hook-like structure ( Figs. 113 , 195 ) instead of an apical tooth-like structure in P. alloportokalis ( Fig. 19 ). In P. dimidiatus , the apical tip of the paramere is rounded in dorsal view ( Figs. 114–115 ), while in P. rufipennis the apical tip of the paramere is emarginate in dorsal view ( Figs. 196–197 ).

Description. Forebody ( Fig. 109 ) length 6.5–7.7 mm. Color of head and pronotum dark brown to black; antennae orange; pro- and middle legs orange; hind legs dark brown to black except metatarsi dark orange; elytra and mesoscutellum orange; abdomen dark brown to black except segments 7–8 (orange). Antenna ( Fig. 112 ) with antennomere 3 without tomentose pubescence; antennomere 4 with tomentose pubescence; antennomeres 4–5 longer than wide; antennomere 6 subquadrate; antennomeres 7–10 transverse. Head transverse; HW/HL ratio = 1.32–1.53. Left mandible with bicuspid tooth. 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. Pronotum ( Fig. 111 ) subquadrate; PW/PL ratio = 1.0–1.04. Lateral margins of pronotum in dorsal view posteriad of midpoint strongly converging; pronotum with 3–4 sparse rows of punctures on each half beside median impunctate line; distance between punctures as wide as 1–2 punctures but large areas of pronotum without punctures. EL/PL ratio = 1.40–1.48. Elytra with dense punctation; distance between punctures as wide as 0.5–1 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), although on some specimens curved carina not as impressed on tergite 5. In males, sternite 7 without porose structure, sternite 7 with shallow and broad emargination posteriorly; sternite 8 with small U-shaped emargination posteriorly ( Fig. 110 ). Aedeagus as in Figs. 113–115 ; in dorsal view paramere almost parallel-sided converging to rounded apex; paramere slightly shorter and narrower than median lobe; in lateral view paramere becoming narrower near tip; paramere with peg setae in lateral rows as in Fig. 115 . Median lobe in dorsal view converging to narrow pointed tip; in lateral view median lobe becoming narrower, with strong apical hook-like tooth.

Distribution. Known from South Brazilian biogeographic dominion. Distributed in the department of Cochabamba in Bolivia. Map is shown in Fig. 22 .

Habitat. Collected at mid elevations (1000 m).

Figures

FIGURE 22. Distribution map of Photinopygus alloportokalis Chatzimanolis (triangles), P. dimidiatus (Bernhauer) (circle), and P. rufipennis (Sharp) (squares).

FIGURES 109–112. Photinopygus dimidiatus (Bernhauer). 109. Habitus. 110. Sternites 7–8. 111. Pronotum. 112. Antenna. Not to scale.

FIGURES 113–115. Aedeagus of Photinopygus dimidiatus (Bernhauer). 113) Lateral view. 114. Dorsal view. 115. Detail of paramere, ventral view.

FIGURES 195–197. Aedeagus of Photinopygus rufipennis (Sharp). 195. Lateral view. 196. Dorsal view. 197. Detail of paramere, ventral view.

FIGURES 19–21. Aedeagus of Photinopygus alloportokalis Chatzimanolis. 19. Lateral view. 20. Dorsal view. 21. Detail of paramere, ventral view.