Photinopygus mexicanus Chatzimanolis, 2023

Chatzimanolis, Stylianos, 2023, A revision of the genus Photinopygus Chatzimanolis (Staphylinidae: Xanthopygina), Zootaxa 5292 (1), pp. 1-100 : 66-68

Photinopygus mexicanus Chatzimanolis , new species

( Figs. 161–168 )

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Type material. Holotype, here designated, male, with labels: “ Mexico, San Luis Potosi, El Salto Falls [22.59°, - 99.38°], 15June 1956, R. E. Beer &party [leg.]” /“SM0080035”/ “Holotype Photinopygus mexicanus Chatzimanolis , des. Chatzimanolis 2022 ”. In the collection of SEMC.

Paratypes, 19, here designated: “Mex. [ Mexico] 8 mi S. Simojovel [17.15°, -92.72°], Chis. [Chiapas], v-10-1969 [10.v.1969], J. M. Campbell [leg.]” (1 ♀ CNC); “ Mexico: Chiapas: Playón de la Gloria, 16.14818°N 90.89660°W [16.148°, -90.897°], 180 m, 24-vi-2008 [24.vi.2008], malaise trap, mature wet forest LLAMA08 Ma-A-09-2-01” / “SM0833177” (1 ♀ SEMC); “Canelas [25.10°, -106.57°; in Durango, Mexico]” / “ Xanthopygus flohri Sharp , Museum f. Naturkunde Berlin ( MFNB)” (4 ♀ MFNB); “ Mexico, D.F. [Federal District] El Cantil [19.52°, -99.14°], 8000 ft [2438m], 17.vii.[19]62, H. E. Milliron [leg.]” (1 ♁ CNC); “Santa Lucia [19.75°, -98.98°; in the state of Mexico], Mex. [ Mexico], 4000’ [1219 m], 4Aug. [viii]1964, L.A. Kelton [leg.]” (1 ♀ CNC); “Tejupilco [de Hidalgo; 18.90°, -100.15°] Mex. [ Mexico] vii.1933 ” / “ H.E. Hinton, R.L. Usinger Collectors ” / “28020” / “Blackwelder Collection” (1 ♁, 1 ♀ AMNH); “ Tejupilco [de Hidalgo; 18.91°, -100.15°] vii-1932 [vi.1932], Mex.[ Mexico] D.F. [Federal District] Alt 3960 ft [1207 m]” / “ H. E. Hinton Collector ” / “25845” / “Blackwelder Collection” (1 ♀ AMNH); “ 3 mi S Ixtapan de la Sal [18.83°, -99.68°] Mex. [ Mexico] Mex. [Mexico] vii-18-1974 [18.vii.1974] R. L. Mangan & D. S. Chandler [leg.]” / “ Field Mus. Nat. Hist. Karl H. Stephen Collection 1977 Acc. No. Z-15, 639” / “ Xanthopygina M. K. Thayer det. 1992” / “FMNHINS3989852” (1 ♀ FMNH); “Mexico, Morelos, Cuautla [18.82°, -98.95°] 28 July 1938 [28.vii.1938] L. J. Lipowsky [leg.]” / “SM0080043” (1 ♀ SEMC); “Cuernavaca [18.92°, - 99.23°; in the state of Morelos] Mex [ Mexico] vi-34 [vi.1934]” / “Blackwelder Collection” (1 ♀ AMNH); “Mex: [ Mexico] Nay. [Nayarit] El Pichón [21.55°, -104.96°], vi-25-63 [25.vi.1963]” / “ J. F. Lawrence Collection ” (1 ♀ MCZ); “Lake Catemaco [18.36°, -95.06°] Ver. [Veracruz], Mexico, viii.8–16.1960 [8–16.viii.1960] H. F. Howden [leg.]” (1 ♀ CNC); “Mex-98” [ Mexico, presumably 1898] (1 ♀ MCZ); “ Mexico ” (1 ♁ NHMUK; 1 ♁ MCZ). All paratypes with label: “ Paratype Photinopygus mexicanus Chatzimanolis , des. Chatzimanolis 2022 ” .

Diagnosis. Photinopygus mexicanus 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. mexicanus can be recognized by the following combination of characters: sternite 8 in males with large deep Ushaped emargination posteriorly ( Fig. 162 ), sternite 7 in males with narrow, deep but not ‘shaved’ emargination posteriorly ( Fig. 162 ), antennomeres 8–10 subquadrate ( Fig. 164 ), aedeagus with paramere shorter than median lobe ( Figs. 165–166 ), paramere with rounded apex, median lobe with small subapical tooth, and peg setae as in Fig. 167 .

Description. Forebody ( Fig. 161 ) length 6.5–7.3 mm. Color of head, pronotum and mesoscutellum dark brown to black; antennae orange; 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 (few specimens with anterior half of sternite 7 dark brown to black). Antenna ( Fig. 164 ) 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 = 1.47–1.50. 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. 163 ) subquadrate; PW/PL ratio = 1.05–1.07. 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 = 1.38–1.48. 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 3–4 with curved carina (arch-like); tergite 5 curved carina only at lateral margin; sternite 7 with large porose structure, sternite 7 with narrow and deep emargination posteriorly; sternite 8 with large U-shaped emargination posteriorly ( Fig. 162 ). Aedeagus as in Figs. 165–167 ; in dorsal view paramere converging to narrow rounded apex; paramere shorter and slightly narrower (except apically) than median lobe; in lateral view paramere becoming narrower and concave near tip; paramere with peg setae in multiple lateral rows as in Fig. 167 . 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 Mesoamerican biogeographic dominion. Distributed in the states of Chiapas, Durango, Federal District, Morelos, San Luis Potosi and Veracruz in Mexico. Map is shown in Fig. 168 .

Etymology. The specific epithet is derived from the Spanish mexicano and refers to the country of Mexico.

Habitat. Collected at low to high elevations (180–2438 m) using malaise traps.

Figures

FIGURE 168. Distribution map of Photinopygus mexicanus Chatzimanolis (circles) and P. morosus (Sharp) (squares).

FIGURES 161–164. Photinopygus mexicanus Chatzimanolis. 161. Habitus. 162. Sternites 7–8. 163. Pronotum. 164. Antenna. Not to scale.

FIGURES 165–167. Aedeagus of Photinopygus mexicanus Chatzimanolis. 165. Lateral view. 166. Dorsal view. 167. Detail of paramere, ventral view.