Dolichocaudus, Wang & Zhang, 2020

Wang, Yang & Zhang, Yalin, 2020, Dolichocaudus, a new genus in the leafhopper subfamily Evacanthinae (Hemiptera: Cicadellidae), with description of two new species, Zootaxa 4732 (1), pp. 161-168 : 162

Dolichocaudus gen. n.

( Figs 1–30 )

Type species: Dolichocaudus acicephalus sp. n., here designated.

Diagnosis. This genus differs from all other known genera of Evacanthini in having a larger body, the male pygofer with a posterior digitiform extension; a median lamellate carina extending from the base to apex of the crown, strongly elevated in lateral view; and the anteclypeus inflated indistinctively, extended and tapered distally.

Description. Medium-sized leafhoppers (8.8–10.9 mm long) with dorsal coloration yellowish-brown to dark brown, marked with off-white. Head ( Figs 1, 4 , 12 , 21, 23 , 29 ) triangularly produced in dorsal view, length longer or equal to pronotum and longer than distance between eyes; marginal carina keeled mesad of eyes, keel angulate above eye in lateral view, convergent with lateral carina in front of ocelli; median longitudinal lamellate carina extending from base to apex of crown, strongly elevated in lateral view; basal area swollen medially each side of longitudinal lamellate carina. Ocelli ( Figs 3 , 13 , 22 ) located at side of lateral carina. Face ( Figs 3 , 11 , 19 ) including eyes distinctly longer than wide; frontoclypeus with distinct median longitudinal carina, oblique lateral striations distinct, with median and lateral longitudinal dark-brown streaks; anteclypeus inflated indistinctively, extended and tapered distally, apex with several setae, and with marginal dark-brown streaks; lorum long and narrow, well separated from lateral margin of gena, extended to two-thirds length of anteclypeus. Antennal pit shallow, ledge absent. Pronotum ( Figs 1 , 12 , 21 , 29 ) much broader than head, length subequal to mesonotum [mesonotum = mesoscutum + mesoscutellum]; surface with numerous transverse striations; anterior lateral margin long; posterior margin weakly concave. Forewing ( Figs 1, 2 , 11, 12 , 19, 20 , 28 ) veins raised, four apical cells present, vein R1 reflexed, inner and central anteapical cell open basally, outer anteapical cell not delimited (crossvein absent), claval veins separate throughout length, or fused medially for short distance, appendix absent. Front femur with AM1 enlarged, row AM with ca. 15 setae; intercalary row with ca. 10 setae; row AV with 6 enlarged basal setae and ca. 3 shorter setae more distad; row PV with ca. 4 fine setae, and PV1 enlarged. Front tibia with two dorsoapical setae and row PD with 4 fine setae, row AV with ca. 13 enlarged setae and ca. 13 short setae. Front trochanter with pair of enlarged setae on dorsal surface. Hind femur macrosetal formula 2+1+1; tibia with ca. 26, 14, 21, and 52 setae in rows PD, AD, AV, and PV respectively, and row AD with 4 fine setae between larger setae; tarsus elongate, tarsomere I with pair of dorsoapical setae and two longitudinal rows of plantar setae, tarsomere I pecten with 3 spinelike setae, tarsomere II pecten with 1 spinelike seta and 2 normal platellae.

Male pygofer ( Figs 5 , 24 ) with digitiform caudal extension, without ventral process. Subgenital plate ( Figs 9 , 27 ) 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 6 , 25 ) with apex of apophysis footlike with elongated lateral angle, apophysis apex of uniform width and only near end abruptly narrowed to slender pointed process, apodeme apex curved laterally in ventral view. Connective ( Figs 6 , 25 ) Y-shaped, stem much longer than arms. Aedeagus ( Figs 7, 8 , 25, 26 ) 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 caudal margin truncated; first valvula in lateral view ( Figs 14-15 ) broadened from base to ca. ¼ distance from apex, apical fourth tapered, with strigate sculpturing; second valvula ( Figs 16-17 ) with toothed distal blade broadened, about half total length of valvula, with numerous rounded teeth; third valvula ( Fig. 18 ) with few stout ventral submarginal setae preapically.

Etymology. The genus name Dolichocaudus , a masculine adjective, is a combination of Greek word “dolichos”, meaning “long”, and Latin word “cauda”, meaning “tail”, referring to the male pygofer with digitiform extension caudally.

Distribution. China, Thailand.

Figures

FIGURES 1–9. Dolichocaudus acicephalus sp. n., male: 1. Habitus, dorsal view; 2. Habitus, lateral view; 3. Face; 4. Head, lateral view; 5. Pygofer side, lateral view; 6. Connective and style, ventral view; 7. Aedeagus, lateral view; 8. Aedeagus, ventral view; 9. Subgenital plate, ventral view.

FIGURES 10–18. Dolichocaudus acicephalus sp. n., female: 10. Habitus, dorsal view; 11. Habitus, lateral view; 12. head; 13. Face; 14. Apex of first valvula; 15. First valvula; 16. Apex of second valvula; 17. Second valvula; 18. Third valvula.

FIGURES 19–27. Dolichocaudus brevicephalus sp. n., male: 19. Habitus, dorsal view; 20. Habitus, lateral view; 21. Head, dorsal view; 22. Face; 23. Head, lateral view; 24. Pygofer side, lateral view; 25. Aedeagus, connective and style, ventral view; 26. Aedeagus, lateral view; 27. Subgenital plate, ventral view.

FIGURES 28–30. Dolichocaudus brevicephalus sp. n., female: 28. Habitus, dorsal view; 29. Head, dorsal view; 30. apex of female abdomen, ventral view.