Metanigrus chromus Lv & Chen, 2021

Lv, Sha-Sha, Bourgoin, Thierry, Yang, Lin & Chen, Xiang-Sheng, 2021, Four new species of the planthopper genus Metanigrus Tsaur, Yang & Wilson from China (Hemiptera, Fulgoromorpha, Meenoplidae), ZooKeys 1024, pp. 197-213 : 197

Metanigrus chromus Lv & Chen sp. nov. Figs 1 , 2 , 9-19

Measurements.

Total length: male 3.90-4.31 mm (N = 18), female 4.31-4.75 mm (N = 31).

Diagnosis.

The salient features of the new species include: frons (Fig. 10 ) with two brownish-black patches on both sides; outer process of gonostyli (Figs 13 , 16 ) differentiated into two processes nearly equal at apex in lateral view; only basolateral side of anal tube (Figs 13 , 16 ) with a finger-like process.

Coloration.

General color grayish yellow (Figs 1 , 2 ). Vertex yellowish white. Eyes blackish red. Frons whitish yellow, a yellowish-brown stripe in middle, with two brownish-black patches on both sides. Clypeus black-brown. Pronotum sublaterally with brownish-black patches. Mesonotum yellowish brown, with brown stripe medially. Legs yellowish brown. Tegmen hyaline, veins brownish. Wings semitransparent. Abdomen brown.

Head and thorax.

Head (Figs 1 , 9 ) significantly narrower than pronotum, median carina absent. Vertex shorter in middle line than wide at base (1: 1.51), with two posterolateral areolets at base not meeting medially. Frons (Fig. 10 ) subrectangular, without median carina, longer in middle line than wide at widest portion (about 1.45: 1), lateral carinae with a dense row of sensory pits along outer margin. Postclypeus (Fig. 10 ) with distinct median and lateral carinae. Frontoclypeal suture nearly straight. Rostrum elongate, surpassing hind-coxae. Pronotum (Fig. 9 ) wider than maximum width of head (including eyes) (1.37: 1), lateral carinae sinuate, median carina present. Mesonotum (Fig. 9 ) about 6.14 times longer than pronotum in midline, with distinct median carina. Tegmina (Fig. 11 ) slender, longer than maximal width (2.41: 1), almost as wide at postnodal as prenodal area, veins ScP + R + MP with several sensory pits, MP 3 two branched; five postnodal closed cells with C1 smaller than C2, C5 placed next to C3, C4 distally displaced after the nodal line, im, r-m and anterior two-thirds of margin with white areas. Hind wing (Fig. 12 ) 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 13 , 14 , 16 , 17 ) symmetrical, gradually narrowed towards apex, with sinuate anterior and posterior margins. Pygopher with internal sulcus and almost parallel lateral margins in ventral view. Anal tube (Figs 13 , 16 ) in lateral view, hand-shaped, anal style stout, lateral lobes distally shorter than anal style, basolateral side with a long finger-like process. Aedeagus (Figs 13 , 15 , 16 , 19 ) acuminate apically, with tubular periandrium, lateral lobes swelling on both sides, surface beset with scale-like productions, ventral lobe slender with an acute apex, dorsal lobes with an acute and a nearly rectangular process; in ventral view, base wider. Gonostyli (Figs 13 , 14 , 16-18 ) divided into two parts, inner process curved apically, tapering into a process; in lateral view, outer process convex, bifurcated nearly equally at apex, inner margin with long setae; in ventral view, divergent, duck-shaped.

Type material.

Holotype: ♂, China: Hubei, Dabieshan National Natural Reserve (31°03'N, 115°40'E), 2 July 2014, Jian-Kun Long; Paratypes : 2♂♂, 7♀♀, Hubei, Dabieshan National Natural Reserve , 29-30 June 2014, Zhi-Min Chang and Mei-Na Guo ; 15♂♂, 24♀♀, Hubei, Dabieshan National Natural Reserve , 2-3 July 2014, Jian-Kun Long, Zheng-Xiang Zhou, Ying-Jian Wang, Mei-Na Guo and Hai-Yan Sun .

Etymology.

The species name is derived from the Latin adjective " Metanigrus chromus ", referring to frons with two brownish-black patches on both sides.

Remarks.

This species is similar to Metanigrus yami Tsaur, Yang & Wilson, 1986, but differs from the latter in: (1) frons with two brownish-black patches on both sides (frons without two brownish-black patches on both sides in M. yami ); (2) basolateral side of anal tube with a long curved finger-like process (basolateral side of anal tube with a short finger-like process in M. yami ); (3) outer process of gonostyli without a thumb-like process (outer process of gonostyli with a thumb-like process in M. yami ).

Distribution.

China (Hubei) (Fig. 61 ).

Figures

Figure 61. Geographic distributions of Metanigrus species.

Figures 1 - 8. Metanigrus chromus sp. nov., male 1 dorsal view 2 lateral view. Metanigrus guttatus sp. nov., male 3 dorsal view 4 lateral view. Metanigrus gremius sp. nov., male 5 dorsal view 6 lateral view. Metanigrus spinatus sp. nov., male 7 dorsal view 8 lateral view. Scale bars: 0.5 mm.

Figures 9 - 19. Metanigrus chromus sp. nov., male 9 head and thorax, dorsal view 10 frons, ventral view 11 tegmina 12 wing 13, 16 pygofer, lateral view 14, 17 gonostyli and pygofer, ventral view 15 aedeagus, left lateral view 18 gonostyli, dorsal view 19 aedeagus, ventral view. Scale bars: 0.3 mm.