Longtania arcuata, Qin, Dao-Zheng & Zhang, Ya-Lin, 2009

Qin, Dao-Zheng & Zhang, Ya-Lin, 2009, A new species of Longtania Ding from China and redescription of the male genitalia of Platytibia ferruginea Ding (Hemiptera: Fulgoromorpha: Delphacidae), Zootaxa 1979, pp. 62-68 : 64-66

Longtania arcuata n. sp.

( Figs. 1–15 )

Description. Body length: male (macropterous, N=4) 2.45–2.52 mm, (brachypterous, N=1) 2.49 mm; female (macropterous, N=2) 2.90–3.05 mm, (brachypterous, N=1) 2.72 mm.

Colour. General color brown. Vertex and antennae yellowish brown, submedian carinae of vertex bordered by blackish brown laterally. Frons and clypeus yellowish brown to tawny brown, in some specimens frons sordid white medially. Pronotum blackish brown laterally. Tegmina hyaline and lustrous, macropterous forewings speckled with dark brown flecks, apex of clavus with dark spot ( Fig. 4 ); in brachypterous form with apical margin and apex of clavus black ( Fig. 5 ). Dorsum and venter of abdomen with irregular sordid patches laterally on each segment. Legs yellowish brown to tawny brown except fore- and midcoxae black. Male pygofer with parameres and anal segment blackish brown. Ovipositor brown to sordid yellow.

Head. Including eyes narrower than pronotum (0.74–0.77:1). Vertex elongate, longer medially than wide at base about 1.4: 1, anterior margin rounded, submedian carinae uniting before apex of vertex, lateral carinae sinuate, slightly converging anteriorly, posterior margin nearly straight or concave medially ( Fig. 1 ), in lateral view meeting lateral carinae of frons with approximately right angle at fastigium, submedian carinae slightly raised above level of lateral carinae until just beyond fastigium ( Fig. 3 ). Frons in midline longer than maximum width about 2.6:1, widest at level of ocelli, lateral carinae subparallel below ocelli ( Fig. 2 ). Postclypeus and anteclypeus with distinct median carinae, together approximately 0.75x length of frons, in profile shallowly convex ( Fig. 3 ). Postclypeus slightly wider than frons at apex ( Fig. 2 ). Antennae cylindrical, reaching frontoclypeal suture, segment I about as long as wide, shorter than segment II about 1: 2.0 ( Fig. 2 ).

Thorax. Pronotum in dorsal view approximately 0.63x length of vertex, posterior margin deeply cleft, lateral carinae reaching posterior margin, converging apically ( Fig. 1 ), pronotum width 0.72–0.83, length 0.18–0.22. Mesonotum in macropterous form 0.54–0.58 mm long, in brachypterous form 0.36 mm long, lateral carinae extending to posterior margin, median carina obscure apically ( Fig. 1 ). Tegmina in macropterous form 2.8–3.2 mm long, surpassing tip of abdomen by nearly one third of its total length, in brachypterous form attaining or surpassing end of 4th abdominal segment, widest at middle portion, rounded apically ( Fig. 5 ). Legs with tibia normal (not expanded), metatibia 0.76–0.84 mm long, metabasitarsus (0.36–0.42) nearly as long as tarsomere 2 (0.14–0.18) + 3 (0.24–0.30) combined, calcar (0.33–0.34) slightly shorter than metabasitarsus, thick foliaceous, tectiform, with 15–17 small, black-tipped marginal teeth.

Abdomen (except genitalia). Male drumming organ with 2 elongate apodemes directed dorsocaudad, nearly attaining tergite.

Male genitalia. Pygofer in lateral view with laterodorsal angle angulately produced caudad, wider ventrally than dorsally, laterocaudal margins sinuate ( Fig. 7 ). Diaphragm narrow, mediodorsal process strongly sclerotised and concave medially, directed dorsocaudad, ornamented with numerous tiny teeth ( Fig. 8 ). Parameres broad, long, tips converging laterally basad, tip expanded ( Fig. 15 ). Aedeagus laterally compressed, curved dorsad, gradually narrowing towards pointed apex, submedially with 4 distally acuminate spine-like processes, 3 on the left side and 1 to the right on dorsal side, gonopore subapical on ventral surface ( Figs 9, 11, 12 ). Suspensorium rectangular, strap-like ( Fig. 10 ), fused with the dorsal base of the aedeagus ( Figs 9, 11, 12 ). Opening for parameres large, dorsal margin arched upward, medially nearly straight, lateral margins slightly sinuate, ventral margin concave ( Fig. 8 ).

Type material. Holotype male (macropterous), China: Hubei Province, Wufeng County, Houhe Nature Reserve, Duling, 11.VII.2005, coll. Lin Lv ( NWAFU). Paratypes. China: 4 males, 2 females (macropterous); 1 male, 1 female (brachypterous), same data as holotype ( NWAFU).

Etymology. The name is derived from the Latin word “arcuatus” (curved) which refers to the curved aedeagus.

Distribution. Known only from the type locality in central southern China (Hubei Province).

Remarks. This species can be differentiated from L. picea by the characters used in the key. Furthermore, the distributions are distinct ( L. arcuata in central southern China while L. picea is in southern China).

Figures

FIGURES 1 – 15. Longtania arcuata n. sp., 1, head and thorax, dorsal view; 2, frons and postclypeus; 3, head and pronotum, left lateral view; 4, right tegmen, macropterous male; 5, left tegmen, brachypterous male; 6, male genitalia, caudal view; 7, same, left lateral view; 8, pygofer, caudal view, anal segment, aedeagus and parameres removed; 9, anal segment, suspensorium, aedeagus and parameres, left lateral view; 10. suspensorium, dorsobasal view; 11, aedeagus, left lateral view; 12, same, right lateral view; 13, apex of aedeagus, ventrocaudal view; 14, anal segment, caudal view; 15, parameres, caudal view.