Ivmaka Xu & Dietrich, 2023

Xu, Ye, Zhang, Peng-Wen, Dietrich, Christopher H. & Qin, Dao-Zheng, 2023, A new genus of Empoascini (Hemiptera, Cicadellidae, Typhlocybinae) from Papua New Guinea, Zootaxa 5271 (1), pp. 175-179 : 176

Ivmaka Xu & Dietrich , gen. nov.

Type species: Ivmaka longicaudatus Xu & Dietrich sp. n., here designated.

Description. Body robust. Head including eyes broader than pronotum in dorsal aspect, crown short and broad, round anteriorly, length less than half width between eyes, coronal suture long, restricted by vertex and postfrons, dorsal part of the frontoclypeus (above antennal pits) with median longitudinal suture continuous with coronal suture ( Figs. 1, 3 ). Ocelli distinct, located on anterior margin of crown midway between eyes and coronal suture ( Fig. 3 ). Face moderately broad; lateral frontal suture well delimited, curved mesad above antennal pit and meeting epistomal suture at midline ventromesad of ocelli; anteclypeus slightly convex, not expanded; rostrum distinctly overlapping base of hind coxae ( Fig. 3 ). Pronotum large, almost twice as long as crown, with sinuate transverse depression ( Fig. 1 ). Forewing narrow, round apically, apical cells occupying nearly one-third of total length, c and r cells nearly equal in width, both narrower than m and cua cells; vein R2 and RM arising from r cell, connected by cross-vein, vein MCu arising from m cell, veins RM and MCu evenly curved and almost parallel throughout their length ( Fig. 5 ). Hind wing with CuA unbranched ( Fig. 6 ). Front femur seta AM1 stout, situated near ventral margin; intercalary row with one large basal seta and five smaller setae more distad. Hind femur with macrosetal formula 2+1+1. Hind-tibia row AV with six preapical macrosetae ( Figs. 1–3 ).

Male 2S abdominal apodemes well developed ( Fig. 4 ). Male pygofer elongate, posterior margin extended into sharp point, with conspicuous basolateral setal group and macrosetae, distal setal group scattered on each side of lobe, dorsal bridge well delimited, ventral appendage absent ( Figs. 7, 8 ). Anal tube process well developed, extended to ventral margin of pygofer lobe ( Fig. 9 ). Style broadened at base, sinuate in ventral and lateral views, apex tapered, dentifer adorned with tiny teeth and preapical setae ( Fig. 10 ). Connective much longer than broad, caudal margin notched medially ( Fig. 11 ). Subgenital plate extended beyond main part of pygofer lobe but not surpassing distal process, broadest near base and slightly trapered and upturned apically, basolateral lobe rounded; four categories of setae present: basal setae slim, arranged in row along basolateral lobe; marginal setae well defined but somewhat irregularly arranged, limited to distal part of plate margin; macrosetae uniseriate, reaching apex of plate; feeble microsetae numerous, scattered, longer than macrosetae ( Figs. 7, 12 ). Aedeagus shaft tubular, preatrium short, dorsoatrium well developed, gonopore apical on ventral surface ( Figs. 13, 14 ).

Notes. This new genus will run to Mindanaoa Mahmood, 1967 and Smyga Dworakowska, 1995 in the generic key of Xu et al. (2021) but differs from Mindanaoa Mahmood and Smyga Dworakowska in presence of a well-developed dorsoatrium on the aedeagus ( Fig. 13 ) (dorsoatrium absent in Mindanaoa Mahmood and Smyga Dworakowska ). Among other previously described genera in Empoasca -group, this new genus is superficially similar to Dapitana Mahmood, 1967 and Serratulus Mahmood, 1967 in having the coronal suture well developed ( Fig. 3 ), and vein R2 and RM connected by a cross-vein in the forewing ( Fig. 5 ). However, this new genus differs from Dapitana Mahmood in having the pygofer with a conspicuous basolateral setal group ( Fig. 7 ) and vein ScP+RA present on the forewing ( Fig. 5 ) (absent in Dapitana Mahmood ). It differs from Serratulus Mahmood, 1967 in having the subgenital plate with macrosetae uniseriate ( Fig. 12 ) (vs. arranged in two rows). Furthermore, this new genus is unique in having the pygofer lobe extended into a distal spine-like process surpassing the subgenital plate ( Figs. 7, 8 ).

Distribution. Papua New Guinea.

Etymology. The generic name alludes to the locality of the type material (Ivimka Res. Station). Gender: masculine.

Figures

FIGURES 1–6. Ivmaka longicaudatus Xu & Dietrich, sp. nov. 1. male adult (abdomen removed), dorsal view; 2. male adult (abdomen removed), left lateral view; 3. face; 4. sternal apodemes; 5. forewing; 6. hind wing.

FIGURES 7–14. Ivmaka longicaudatus Xu & Dietrich, sp. nov. 7. male genital capsule, left lateral view; 8. male pygofer, dorsal view; 9. anal tube, left lateral view; 10. style; 11. connective; 12. subgenital plates; 13. aedeagus, left lateral view; 14. aedeagus, ventral view.