Transvenosus, Wang, Yang & Zhang, Yalin, 2015

Wang, Yang & Zhang, Yalin, 2015, Transvenosus, a new genus in the leafhopper subfamily Evacanthinae (Hemiptera: Cicadellidae), with description of one new species, Zootaxa 4052 (5), pp. 595-600 : 595-597

Transvenosus gen. n. ( Figs 1–24 )

Type species: Transvenosus nigrodorsalis sp. n., here designated.

Diagnosis. This genus differs from all other known genera of Evacanthini in having the male pygofer with slender ventral processes, the crown strongly concave between three dorsally angulate longitudinal keels, forewing veins raised, and 1–3 crossveins present between two claval veins.

Description. Small leafhoppers (6.3–7.2 mm long) with dorsal coloration brown to black, marked with off-white. Head ( Figs 1 , 9 , 18 ) triangularly produced in dorsal view, length equal to pronotum and distance between eyes; lateral margins keeled mesad of eyes, keel angulate above eye in lateral view; median longitudinal lamellate carina extending from base to apex of crown; basal area swollen medially each side of longitudinal lamellate carina. Ocelli ( Figs 1, 2 , 9, 10 , 18 ) located at side of lateral carina, about midway between corresponding eye and apex of crown. Face ( Figs 3 , 11 , 19 ) including eyes distinctly longer than wide; frontoclypeus with distinct median longitudinal carina, oblique lateral striations distinct; anteclypeus inflated, tapered in distal one-third, apex with several setae; lorum broad, well separated from lateral margin of gena, extended to two-thirds of anteclypeus. Antennal pit shallow, ledge absent. Pronotum ( Figs 1 , 9 , 18 ) much broader than head, length subequal to combined mesonotum and scutellum; surface with numerous transverse striations; anterior lateral margin long; posterior margin weakly concave. Forewing ( Figs 1, 2 , 9, 10 , 18 ) veins raised, four apical cells present, vein R1 somewhat reflexed, inner and central anteapical cell open basally, outer anteapical cell not delimited (crossveins absent), claval veins separate throughout length, 1–3 crossveins present between two claval veins, appendix absent. Front femur ( Fig. 17 ) with AM1 enlarged, row AM with ca. 20 setae; intercalary row with ca. 14 setae; row AV with four enlarged basal setae and ca. 7 shorter setae more distad; row PV with ca. 4 fine setae, and PV1 enlarged. Front tibia with two dorsoapical setae and row PD with two fine setae, row AV with ca. 10 enlarged setae and ca. 9 short setae. Front trochanter with pair of enlarged setae on dorsal surface. Hind femur macrosetal formula 2+1+1; tibia with ca. 23, 13, 16, and 35 setae in rows PD, AD, AV, and PV, respectively; tarsus elongate, tarsomere I with pair of dorsoapical setae and two longitudinal rows of plantar setae, pecten of tarsomeres I and II each with 4 tapered setae.

Male pygofer ( Figs 4, 5 , 12, 13 ) with slender ventral process arising at base proceeding along lower margin of pygofer. Subgenital plate ( Figs 6 , 14 ) with single inner longitudinal row of macrosetae extended from near base to apex; numerous long, fine setae sparsely distributed over surface laterad of macrosetae. Style ( Figs 8 , 16 ) with footlike apex of apophysis having elongated lateral angle, apodeme apex acute. Connective ( Figs 8 , 16 ) Y-shaped, stem much longer than arms. Aedeagus ( Figs 7, 8 , 15, 16 ) with bilobed, lamellate apodeme arising from atrium and extended dorsolaterad; with lamellate ventral apophysis; shaft short, recurved dorsally; gonopore apical on dorsal surface. Female sternite VII ( Fig. 20 ) produced both medially and laterally; first valvula in lateral view ( Figs. 21–22 ) broadened from base to ca. ¼ distance from apex, apical fourth tapered, with strigate sculpturing; second valvula ( Fig. 23 ) with toothed distal blade broadened, about half total length of valvula, with numerous rounded teeth; third valvula ( Fig. 24 ) with few stout ventral submarginal setae preapically.

Etymology. The genus name, a combination of “trans”, meaning “cross”, and venosus, meaning “with veins” and referring to the presence of the crossveins between two claval veins.

Distribution. Thailand.

Figures

FIGURES 1 – 8. Transvenosus nigrodorsalis sp. n., male: 1. Habitus, dorsal view; 2. Habitus, lateral view; 3. Face; 4. Pygofer side, lateral view; 5. Genital capsule, lateral view; 6. Subgenital plate, ventral view; 7. Aedeagus, lateral view; 8. Aedeagus, connective and style, ventral view.

FIGURES 9 – 17. Transvenosus signuma (Li & Webb, 1996), n. comb., male: 9. Habitus, dorsal view; 10. Habitus, lateral view; 11. Face; 12. Pygofer side, lateral view; 13. Genital capsule, lateral view; 14. Subgenital plate, ventral view; 15. Aedeagus, lateral view; 16. Aedeagus, connective and style, ventral view; 17. Front femur, anterior view.

FIGURES 18 – 24. Transvenosus nigrodorsalis sp. n., female: 18. Habitus, dorsal view; 19. Face; 20. sternite VII; 21. Apex of first valvula; 22. First valvula; 23. Second valvula; 24. Third valvula.