Iuiuiacaeca gen. n., sp. n., a new troglobitic planthopper in the family Kinnaridae (Hemiptera, Fulgoromorpha) from Brazil Author Hoch, Hannelore Author Ferreira, Rodrigo Lopes text Deutsche Entomologische Zeitschrift 2016 63 2 171 181 http://dx.doi.org/10.3897/dez.63.8432 journal article http://dx.doi.org/10.3897/dez.63.8432 1860-1324-2-171 8F213373CE75493F9973503CF5B9E761 Taxon classification Animalia Hemiptera Kinnaridae Iuiuia Hoch & Ferreira gen. n. Type-species. Iuiuia caeca sp. n. (type locality: Brazil, Bahia State, Iuiu municipality). Diagnosis. Small kinnarid (ca. 3 mm body length), strongly troglomorphic: compound eyes absent, tegmina reduced, wings vestigial, body pigmentation reduced (Fig. 3). Iuiuia gen. n. can be distinguished from all other kinnarid genera by the unique combination of the following characters: vertex wide and short; male genitalia with genital segment in caudal aspect approximately in a figure-8-shape; anal segment short, ventrally on each side with a distinct wing-shaped compressed process; parameres slender, narrow throughout, medially converging; aedeagus tubular, stout, periandrium with two large, lateral lobes. Iuiuia gen. n. differs conspicuously from Kinnapotiguara (Hoch & Ferreira, 2013) in the configuration of the male genitalia ( Hoch and Ferreira 2013 : Figs 4, 5-10): genital segment with caudal margin smooth (vs caudal margin with lateral processes in Kinnapotiguara ); anal segment with two short, wing-shaped lateroventral processes (vs anal segment with two pairs of slender processes in Kinnapotiguara ); parameres narrow, slender throughout, medially converging (vs parameres differentiated into three processes in Kinnapotiguara ) and aedeagus with two large lateral lobes (vs aedeagus without lateral processes in Kinnapotiguara ). Description. Head. Vertex trapezoidal, short, ca. 3 x wider posteriorly than medially long, with a very faint median carina; anterior and posterior margin of vertex parallel. Frons narrow, ca. 1.8-2.0 x longer than maximally wide, widest between level of antennae and frontoclypeal suture, ca. 1.3 x longer than post- and anteclypeus together, surface medially smooth, devoid of a median carina, lateral margins distinctly ridged. Frontoclypeal suture nearly straight. Post- and anteclypeus with a distinct median carina. Rostrum elongate, in repose well surpassing hind coxae, third joint shorter than second. Compound eyes absent, their former position recognizable by a shallow, vaulted area. Median (frontal) ocellus absent, lateral ocelli vestigial. Antennae with scape short, subcylindrical, slightly expanding distally; pedicel subcylindrical, ca. 2.4 x as long as wide, with distinct sensory plaque organs; arista ca. 2.8 x as long as pedicel. Thorax. Pronotum tricarinate, ca. 3 x wider than vertex posteriorly, short, posterior margin medially shallowly concave; carinae distinct, median carina attaining but not surpassing anterior margin of pronotum; lateral carinae medially more or less parallel to posterior margin, and joining posterior margin laterally. Mesonotum faintly tricarinate, ca. 1.3 x wider than medially long. Tegulae vestigial. Hind tibiae laterally unarmed, distally with 7 slender teeth, arranged in a shallow arc. First metatarsal joint distally with 4/5 and 5/6, 2nd metatarsal joint with 3/4 or 4/5 teeth (individually and bilaterally variable). Pretarsal claws and arolia small, inconspicuous. Tegmina (Fig. 4) comparatively short, very shallowly tectiform, almost flat, in repose, in males either slightly shorter than tip of abdomen (parameres), or just reaching tip of abdomen, or slightly surpassing it; in females slightly shorter than tip of abdomen (dorsal margin of gonocoxae VIII); venation in proximal portion as in epigean Kinnaridae with a large and wide subcostal cell; clavus cixioid (sensu Emeljanov 1984 ), i.e., common claval vein (Pcu and A1) reaching hind margin of clavus (vein A2); basal cell of forewing closed by anastomosis of M and CuA, without conspicuous arculus; tegmen distally of nodal line distinctly reduced and variable among specimens with 6 distal marginal cells, partly incompletely delimited due to reduced distal marginal veins. Hind wings vestigial, very short, venation strongly reduced. Figure 4. Iuiuia caeca sp. n. Left tegmen, male (paratype). Scale bar 0.1 mm. Male genitalia. Genital segment bilaterally symmetrical, in lateral aspect short, ca. 3 x as high as medially long; in caudal aspect approximately figure-8-shaped, in upper third laterally constricted, with a narrow transversal bridge; anterior margin of genital segment smooth, without any conspicuous median apodemes; medioventral process prominent, broadly subtriangular, in lateral aspect distinctly exceeding caudal margin. Anal segment bilaterally symmetrical, short, stout, ventrally on each side with a compressed wing-shaped process. Parameres slender, narrow throughout, medially converging. Connective straight, narrow, almost terete. Aedeagus bilaterally symmetrical, tubular, stout; periandrium with two large lateral lobes; proximal apodeme of aedeagus (= "tectiform structure": term applied by Bourgoin 1997 for Meenoplidae ) slender, with dorsal and ventral margins rapidly diverging, proximal margin rounded. Females with abdominal tergites VI, VII and VIII bearing wax-fields. Female genitalia as in other Kinnaridae of the non-piercing type; sternite VII broadly rectangular, caudal margin straight; caudal margin of sternite VIII medially deeply incised; gonocoxae VIII bilobate, both lobes well developed, apically converging. Etymology. The genus name refers to Iuiu , the name of the municipality were the cave (type locality) is situated. The gender is feminine.