Tetralidia, Marques-Costa, Ana Paula & Cavichioli, Rodney Ramiro, 2008

Marques-Costa, Ana Paula & Cavichioli, Rodney Ramiro, 2008, Tetralidia gen. nov., a new neotropical genus of Neocoelidiinae (Hemiptera, Cicadellidae), Zootaxa 1892, pp. 26-34 : 27-31

Tetralidia gen. nov.

( Figures 1–23 )

Type species: Cocoelidia prolata Chiamolera & Cavichioli, 2004 .

Diagnosis. Crown with two pairs of orange maculae, one close to anterior margin and another close to posterior margin, adjacent to compound eyes ( Figs 1 , 10 ); transverse carina present at transition between crown and frons ( Fig. 12 ); ocelli on anterior margin of head, at transition between crown and frons ( Figs 2 , 11–12 ); clypeus with lateral margins convergent apically ( Figs 2 , 11 ); posterior margin of pronotum emarginated and V-shaped ( Figs 1 , 10 ); forewings with venation indistinct or slightly distinct with four apical cells and three anteapical cells ( Figs 3 , 13 ); hindwings with R4+5 and M1+2 preapically convergent, fused at apex, forming single vein. Male genitalia. Pygofer without processes or teeth ( Figs 4 , 14–15 ); connective V- or H-shaped, with forked stem at articulation point with aedeagus ( Figs 7 , 18 ); aedeagus long and slender with pair(s) of apical or preapical processes or lamellae ( Figs 8–9 , 19–21 ); anal tube with pair of basal processes ( Figs 4 , 14–15 ).

Total length. 8.0–9.6 mm.

Coloration. Body mostly yellow. Crown with two pairs of orange maculae, one close to anterior margin and another close to posterior margin, adjacent to compound eyes. Pronotum and scutellum with or without orange maculae or stripes ( Figs 1 , 10 ). Yellowish forewings without maculae ( Figs 3 , 13 ).

Description. Crown almost quadrangular, slightly projected anteriorly, as wide as long; median length of crown approximately equal to interocular width and half of transocular width; anterior margin angular ( Figs 1 , 10 ), with transverse carina at transition between crown and frons ( Fig. 12 ); lateral margins, adjacent to compound eyes, elevated (not at same level of dorsum of compound eyes) and not carinate; surface flat and smooth, or slightly grooved (in T. prolata ), with coronal maculae and coronal suture indistinct ( Figs 1 , 10 ); ocelli located on anterior margin of head, at transition between crown and frons, closer to compound eyes than to midline; antennal ledges, in lateral view, oblique and carinate ( Fig. 12 ); antennal pit located slightly above or at same level of anteroventral angles of compound eyes ( Fig. 12 ); antennal flagellum extended beyond basal half of forewings; frons length approximately 1.5 or two times basal width, profile convex, not swollen on central portion of base and not carinate; muscle impressions indistinct to slightly distinct; frontogenal sutures reaching ocelli; apical margin of maxillas approximately even with apex of clypeus; lorum approximately half-moon shaped, inferior margins not reaching apical margin of clypeus; gena partially concealing proepisterna, only apices visible in anterior view; epistomal suture distinct and complete, straight; clypeus with lateral margins convergent apically, and apical margin straight, with a slight gibbosity in lateral view ( Figs 2 , 11–12 ).

Thorax. Pronotum width between humeri approximately equal to transocular width, median length one third of width between humeri; posterior margin emarginate, V-shaped ( Figs 1 , 10 ); dorsal surface with slight transverse grooves; dorsopleural carina complete and evident; mesothorax, in ventral view, moderately swollen; scutellum (sensu Young 1968) smooth, as long as maximum width, with distinct preapical fold ( Figs 1 , 10 ). Forewings ( Figs 3 , 13 ) with rounded apex, without punctuations, hyaline, about 3 to 4.5 times longer than greatest width; venation indistinct or weakly visible, except for claval suture and apical cells; four apical cells present, base of third distal to second and fourth, last two approximately even; three anteapical cells usually distinct only apically, only outer anteapical cell closed; appendix narrow, extending only along first apical cell. Hindwings with three apical cells, R4+5 and M1+2 preapically convergent, fused at apex, forming single vein. Hindlegs: femoral formula 2+2+0 or 2+2+1; setal tibial row AD with long and robust setae, with two or more small intercalary setae; row PD with long, robust, little separated setae, distributed throughout length of tibia, intercalary setae absent; row AV with setae moderately long, distributed only on apical two-thirds of tibia, intercalary setae absent; row PV densely bristly, with short setae at base, becoming progressively longer toward apex; first tarsomere as long as combined length of two distal ones, plantar surface with two parallel rows of short setae.

Abdomen. Male genitalia. Pygofer basally enlarged, slightly narrowed towards apex or strongly narrowed at median third, without macrosetae or processes ( Figs 4 , 14–15 ). Valve entirely fused to subgenital plates and articulated to pygofer. Subgenital plates with variable shape, separated only in distal portion of apex, lateral margins constricted basally or preapically, approximately as long as pygofer, without macrosetae, and in lateral view, without apical tooth ( Figs 5 , 16 ). Style moderately long, without preapical lobe, lateral margins smooth, without irregularities or undulations, apex sclerotized, truncated, and slightly curved ventrally, apical third with bristles ( Figs 6–7 , 17–18 ). Connective V- or H-shaped, articulated to base of aedeagus, with stem forked at articulation point ( Figs 7 , 18 ). Aedeagus long and slender, with long preatrium, and short dorsal apodeme; one or more pair(s) of apical or preapical processes or lamellae present, and apical gonopore ( Figs 8–9 , 19–21 ). Anal tube with pair of basiventral processes of variable shape (extremely long in T. admirabilis sp. nov. and hooklike in T. prolata ) ( Figs 4 , 14–15 ).

Geographical distribution. Brazil and Peru.

Comments. The new genus is similar to Tozzita Kramer in having the lateral margins of the clypeus convergent towards the apex, and in lacking processes on the ventral margin of the male pygofer. It can be distinguished from the other genera of Neocoelidiinae by the following diagnostic characters: (1) male anal tube located on posterodorsal margin of pygofer, with basal pair of processes ( Figs 4 , 14–15 ); (2) male pygofer without processes or teeth ( Figs 4 , 14–15 ); (3) subgenital plates with basal or preapical constriction, separated only in distal portion of apex ( Figs 5 , 16 ); (4) style with truncated apex ( Figs 6–7 , 17–18 ); and (5) long and slender aedeagus, with pair(s) of apical or preapical processes or lamellae ( Figs 8–9 , 19–21 ).

Note. The generic name is feminine and combines the Greek prefix tetra -, which means four, with the suffix - lidia, a suffix common in the names of other genera of Neocoelidiinae . The name refers to the characteristic color pattern of the crown, with four orange maculae, a pair on anterior margin of the crown and the other close to posterior margin, adjacent to compound eyes.

Figures

FIGURES 1 – 9, Tetralidia prolata (Chiamolera & Cavichioli, 2004) comb. nov., male holotype: 1, head, pronotum and scutellum, dorsal view; 2, head, frontal view; 3, forewing; 4, pygofer and anal tube, lateral view; 5, valve and subgenital plates, ventral view; 6, style, lateral view; 7, styles and connective, dorsal view; 8, aedeagus, lateral view; 9, apex of aedeagus, ventral view.

FIGURES 10 – 21, Tetralidia admirabilis sp. nov., male holotype: 10, head, pronotum and scutellum, dorsal view; 11, head, frontal view; 12, head, pronotum and scutellum, lateral view; 13, forewing; 14, pygofer and anal tube, lateral view; 15, pygofer and anal tube, ventral view; 16, valve and subgenital plates, ventral view; 17, style, lateral view; 18, styles and connective, dorsal view; 19, aedeagus, lateral view; 20, apex of aedeagus, ventral view; 21, apex of aedeagus, dorsal view.

FIGURES 22 – 23, primary types, dorsal view: 22, male holotype of Tetralidia prolata (Chiamolera & Cavichioli, 2004) comb. nov.; 23, male holotype of Tetralidia admirabilis sp. nov. Scales = 1.0 mm.