Metanigrus angularus, Lv & Yang & Chen, 2024

Lv, Shasha, Yang, Lin & Chen, Xiangsheng, 2024, Two new species of the planthopper genus Metanigrus Tsaur, Yang & Wilson from China (Hemiptera: Fulgoromorpha: Meenoplidae), with an updated checklist and key to species, Zootaxa 5419 (2), pp. 289-295 : 292-295

Metanigrus angularus sp. nov.

Figs 14–26

Measurements. Length (including forewing): male 3.80–4.11 mm (N = 5), female 4.53–4.85 mm (N = 4).

Diagnosis. Upper part of frons ( Fig. 17 ) grayish yellow, middle and basal parts yellowish brown; forewings ( Fig. 18 ) with black spots, veins brownish black; apex of pygofer ( Fig. 20 ) each with an obtuse process in ventral view; dorsolateral and middle parts of anal tube ( Fig. 19 ) each with a fingerlike process in lateral view, basolateral fingerlike process wide, apex curved dorsad; aedeagus ( Figs 19, 26 ) slender and long, apex curved ventrad in lateral view; outer process of gonostyli ( Figs 19, 23 ) angular at apex in lateral view.

Coloration. General color grayish brown ( Figs 14, 15 ), with thin white wax powder. Head yellowish white. Upper part of frons grayish yellow, middle and basal parts yellowish brown. Clypeus yellowish brown. Eyes black, ocelli grayish white. Pronotum white, middle aera with 2 faint yellowish spots. Mesonotum brownish yellow. Forewings with black spots, veins brownish black. Hindwings hyaline.

Head and thorax. Head ( Figs 14, 16 ) significantly narrower than pronotum, without median carina. Vertex

( Figs 14, 16 ) shorter in middle line than wide basally (1: 2.52), with two posterolateral areolets at base not meeting medially. Frons ( Fig. 17 ) subrectangular, without median carina, longer in middle line than wide at widest portion (about 1.65: 1), lateral carinae with a row of dense sensory pits along outer margin. Postclypeus ( Fig. 17 ) with distinct median and lateral carinae. Frontoclypeal suture nearly straight. Rostrum elongate, in repose well surpassing hind-coxae. Pronotum ( Fig. 16 ) wider than maximum width of head (including eyes) (1.53: 1), with median carina and sinuate lateral carinae. Mesonotum ( Fig. 16 ) about 5.22 times longer than pronotum in midline, with distinct median carina. Forewings ( Fig. 18 ) slender, longer than maximal width (2.76: 1), almost as wide at postnodal as prenodal area, veins ScP + R + MP with several sensory pits, MP3 two branched; five postnodal closed cells with C1 smaller than C2, C5 placed next to C3, C4 distally displaced after nodal line, im, r-m and anterior two-thirds of margin with white areas. Hindwings ( Fig. 21 ) with lateral margin notched at CuA1, CuP, and A2, more strongly at A1; A2 not reaching posterior margin. Metatibiotarsal formula: (3+5)-6-5.

Male genitalia. Pygofer ( Figs 19, 20 ) symmetrical, gradually narrowed towards apex, with sinuate anterior and posterior margins, pygopher with internal sulcus; in ventral view, lateral margins slightly curved, apex each with an obtuse process. Anal tube ( Figs 19, 22 ) in lateral view, hand-shaped, anal style slender, lateral lobes distally shorter than anal style, dorsolateral fingerlike process spindly, apex rounded, middle fingerlike process tapering towards end, acuminate apically, basolateral fingerlike process wide, apex curved dorsad; symmetrical in dorsal view, with two fingerlike processes on each side, middle of basal fingerlike process thinner than two ends, rounded at apex. Aedeagus ( Figs 19, 25, 26 ) slender, long, apex curved ventrad in lateral view, with tubular periandrium, lateral lobes swelling on both sides, surface beset with scale-like productions, ventral lobe short, dorsal lobe fingerlike; in ventral view, wider at base. Gonostyli ( Figs 19, 20, 23, 24 ) slender, divided into two parts, inner process extremely narrow, curved apically, tapering into a process; in lateral view, outer process convex, apex angular, inner margin with long setae; in ventral view, divergent, top of outer process fan-shaped, inner process sharpened downward; in dorsal view, lateral margins curved, outer process angular convex at apex medially.

Type material. Holotype: ♂, CHINA: Menglun Town, Mengla County, Yunnan Province, 21 June 2023, Guang-Li Gou . Paratypes: 4♂♂, 4♀♀, Menglun Town, Mengla County, Yunnan Province, 21 June 2023, Yan-Qiong Yang , Guang-Li Gou .

Etymology. The specific name is derived from the Latin adjective “ angularus ”, referring to the outer process of gonostyli angular at apex in lateral view.

Remarks. This species is similar to M. guttatus Lv & Chen, 2021 , but differs from the latter in: (1) dorsolateral and middle parts of anal tube each with a fingerlike process in lateral view (dorsolateral part of anal tube with a fingerlike process, middle part without fingerlike process in lateral view in M. guttatus ); (2) aedeagus slender and long, apex curved ventrad in lateral view (aedeagus stout, apex not curved ventrad in lateral view in M. guttatus ); (3) outer process of gonostyli angular at apex in lateral view (outer process of gonostyli nearly fan-shaped at apex in lateral view in M. guttatus ).

Distribution. China (Yunnan province) ( Fig. 27 ).

Figures

FIGURE 27. Geographic distribution of Metanigrus species.

FIGURES 14–26. Metanigrus angularus sp. nov., male 14. Habitus, dorsal view; 15. Habitus, lateral view; 16. Head and thorax, dorsal view; 17. Frons, ventral view; 18. Forewing; 19. Pygofer, lateral view; 20. Pygofer, ventral view; 21. Hindwing; 22. Anal tube, dorsal view; 23. Gonostyli, lateral view; 24. Gonostyli, dorsal view; 25. Aedeagus, ventral view; 26. Aedeagus, lateral view. Scale bars: 0.2 mm.