Quinquespinosa, McKamey, 2023

McKamey, Stuart H., 2023, Three new monobasic genera and three new species of the New World treehopper tribe Acutalini (Hemiptera, Membracidae, Smiliinae) with a key to all genera, ZooKeys 1143, pp. 189-203 : 189

Quinquespinosa gen. nov.

Figs 18-24 , 25-31

Type species.

Quinquespinosa septamacula sp. nov.

Diagnosis.

Forewing with basal cell M and discoidal cell R2+3, without discoidal cell M, 1 m-cu crossvein; pronotum with 2 suprahumeral and 3 apical, slender spines.

Description of female.

Head. Vertex glabrous, without ridges, slightly concave with linear furrow between ocellus and eye; ocelli slightly oblong, divergent dorsally, slightly closer to each other than to the eye; dorsal margin weakly convex but not attaining dorsal margin of eye, which is elevated (Figs 19 , 23 ); lateral margin below eyes straight, slightly upturned; frontoclypeus acute, sutures vertical, joining horizontally (truncate dorsally). Pronotum. Longitudinally divided into 2 parts by strong dorsal constriction (Figs 18 , 22 ), anterior part elevated, evenly convex with pair of slender suprahumeral spines directed laterally (Figs 18 , 19 , 22 , 23 ), posterior part swollen and bearing 3 apical, slender spines (Figs 18 , 22 ). Wings. Forewing with 1 basal cell (M) (Fig. 24 ), 1 discoidal cell (R2+3) (Fig. 21 ), basal cell formed by divergent M and Cu at base, then convergent and completely fused into single vein, then separate again distally (1st m-cu crossvein absent). Hind wing with veins R and M briefly confluent, and 1 m-cu crossvein, with forked anal vein (Fig. 21 ). Legs. Metathoracic tibia with cucullate setal row I double, row II and row III complete and single. Male similar to female.

Distribution.

Neotropical: South America.

Etymology.

The name is feminine and refers to the five (quinque -) spines (- spinosa) on the pronotum.

Notes.

Whereas Euritea has two m-cu crossveins in the forewing, this new genus has only one. Its veins M and Cu separate and diverge at base, then instead of being bridged with an m-cu crossvein as in Euritea and Ceresinoidea , its veins M and Cu completely fuse into a single vein (enclosing basal cell M; Figs 21 , 24 ), then separate again distally as in all other Smiliinae . This unusual venation at the wing base is the same on all wings of all 17 specimens, so is not an aberration. Another interesting feature of this genus is the confluence with the anterior branch of R with M for a short distance, in the hind wing (Fig. 21 ); this trait also occurs in Ceresini as well as in other Smiliinae .

Figures

Figures 18 - 24. Quinquespinosa septamacula, sp. nov. 18 - 20 female habitus in dorsal, anterior, and lateral views, respectively 21 forewing and hind wing 22 - 24 male habitus in dorsal, anterior, and lateral views, respectively.

Figures 25 - 31. Terminalia of Quinquespinosa septamacula sp. nov. 25 male pygofer and subgenital plate in dorsal view 26 undissected male terminalia 27 male pygofer and subgenital plate in ventral view 28, 29 aedeagus and left style in lateral and posterior views, respectively 30 undissected female terminalia 31 distal half of second valvula, lateral view. lp, lateral plate.