Pyrocoelia rubrothorax Zhu & Zhen, 2022

Zhu, Chengqi, Xu, Xiaodong & Zhen, Ying, 2022, Two new species of Pyrocoelia Gorham (Coleoptera: Lampyridae) from Southwest China, Zootaxa 5162 (2), pp. 173-182 : 177

Pyrocoelia rubrothorax Zhu & Zhen , sp. nov.

( Figs. 2 , 4 , 7, 8 )

Description. Male ( Figs. 2 , 4 ): BL 18.2–19.5 mm; BW 8.5–9.2 mm; EL/EW 1.67–1.88; EL/PL=3.92–4.28 (five individuals).

Head. Antenna black, thick and serrate, almost 1/2 as long as body length; first antennomere cone-shaped; second short and cylindrical; third to tenth compressed, with obvious branches originating from inner side; eleventh almost 1.5 times as long as the tenth antennomere, slightly dilated from base to apex; antennal sockets broadly separated from each other. Eyes small, moderately separated above the labrum, weakly oviform laterally. Clypeus and labrum fused together and elongate oval. Mandibles shorter than clypeus and labrum.

Thorax. Pronotum orange in reddish, prosternum and metasternum, hypomera bright orange, with two little transparent cavities; pronotum semi-elliptical; margins of apical and lateral slightly elevated; longitudinal carina distinct. Scutellum ligulate and covered with orange hairs. Elytra in blackish, elongated, subparallel and broadest in apical 2/3. Legs long and thick in blackish, femur orange but rest of the parts in blackish.

Abdomen. Orange in reddish, abdominal terga shorter than elytra; gradually smaller from basal to apical segments, terga wide, with lobate expansion on both sides, apical blunt. Light organ in bright orange ( Fig. 4 ), on the sixth ventrite; seventh ventrite emarginate. Abdominal spiracles on lateral edges of each abdominal segment.

Male genitalia. ( Figs. 7–8 ) Aedeagal sheath ( Fig. 8a–b ) about 2.7 mm long. tergite of the sheath (TS) subtrapezoidal, with base broadly rounded. Aedeagus ( Fig. 7a–c ) about 2.2 mm long, trilobate. Phallus thumb-like, thick and straight, then elliptically expanding, a little shorter than parameres. Parameres robust in basal 1/2, subparallelsided, becoming narrower towards apical; apical arm thumb-like, about 1/3 length of parameres.

Diagnosis. Body elongated, depressed dorsally, antenna serrate, second antennomere short and cylindrical, elytra subparallel. Pyrocoelia rubrothorax sp. nov. resembles P. praetexta Olivier, 1911 from Taiwan, but the elytral edge and elytral flange of P. rubrothorax is black, whereas that of P. praetexta is orange. In comparison with P. praetexta , P. rubrothorax has a more developed male phallus and much straighter parameres.

Pyrocoelia rubrothorax also similar to P. sanguiniventer Olivier, 1911 , known from Taiwan and Hong Kong, but can be distinguished by the following characters: the pronotum margin of P. sanguiniventer is black but reddish in P. rubrothorax ; the color of the metasternum in P. sanguiniventer is black but reddish in P. cenwanglaoensis .

Etymology. The specific name rubrothorax (Chinese name: İḆḛff) refers to the reddish pronotum of the species.

Holotype: CHINA: 1♂, labeled: ‘ China: Guangxi, Baise County, Mt. Cenwanglaoshan , 24°29'42″N, 106°24'28″E, H: 1300 m, 10. XI. 2019, Local People leg. ’;‘ HOLOTYPE (red), ♂, Pyrocoelia rubrothorax sp. n., det. Zhu, Zhen, 2020’ (Westlake University).

Paratype: CHINA: 5♂♂, labeled: ‘ China: Guangxi, Baise County, Mt. Cenwanglaoshan , 24°29'42″N, 106°24'28″E, H: 1300 m, 10. XI. 2019, Local People leg. ’; ‘ PARATYPE (yellow), 5♂♂, Pyrocoelia rubrothorax sp. n., det. Zhu, Zhen, 2020’ (Westlake University).

Distribution. China: Guangxi Province.

Figures

FIGURE 1–2. 1) Habitus of male holotype of Pyrocoelia cenwanglaoensis Zhu & Zhen, sp. nov (a. dorsal view; b. ventral view). Scale bar = 10 mm. 2) Habitus of male holotype of Pyrocoelia rubrothorax Zhu & Zhen, sp. nov (a. dorsal view; b. ventral view). Scale bar = 10 mm.

FIGURE 3–4. 3) Male abdomen and light organs on each of ventrites 5–6 of Pyrocoelia cenwanglaoensis. Scale bar = 1 mm; 4) Male abdomen and light organ only on ventrite 6 of Pyrocoelia rubrothorax. Scale bar = 1 mm.

FIGURE 7–8. 7) Aedeagus of Pyrocoelia rubrothorax (a. dorsal view; b. ventral view; c. lateral view). Scale bar = 1 mm; 8) Aedeagal sheath of Pyrocoelia rubrothorax (a. dorsal view; b. ventral view). Scale bar = 1 mm.