Guyalna tenebrae Ruschel 2017, sp. nov.
Creators: name: Ruschel, Tatiana Petersen
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Guyalna
Guyalna tenebrae

description: Guyalna tenebrae sp. nov.
(Figs. 76–85, 108)
Type locality. Alto Solimões, Amazonas, Brazil.
Type material. Holotype ♂ (MCNZ) (Fig. 76). “ Alto Solimões / AM XII.1979 / A. Lise leg.//Col. MCN / 41845 ”.
Etymology. The name refers to the dark color of the body. Latin: tenebrae, darkness.
Diagnosis. The species can be distinguished from all other species of Guyalna by the emarginated posterior margin of sternite VII, forming two acute apices, the uncus with a long median lobe and the vesica with a lateral projection forming the gonopore. This species has a similar morphology to G. rufapicalis Boulard, 1998 but can be distinguished by the medial margin of timbal cover concave, leaving the timbal mostly exposed, the lateral portion of tergite 1 wider, and by the morphology of the male genitalia.
Color: Body dark brown except operculum and sternites which are tawny. Clavus and base of cubital cell in fore wings, and basal area in hind wings brownish. Legs brownish proximally, becoming tawny distally.
Description: Head (Fig. 79) including eyes, broader than pronotum (except the pronotal collar) and mesonotum. Black band covering vertex to apex of postclypeus and supra-antennal plates. Elliptical eyes projecting laterally beyond anterior angles of pronotum, the internal margin of eyes almost tangent to imaginary line continued from lateral fissure of pronotum. Area behind eyes with setae. Lateral ocelli widely separated, the distance between them equivalent to the distance between each lateral ocellus and eye. Lateral ocelli not higher than median ocellus in frontal view. Antennae totally dark brown. Postclypeus (Fig. 77) dark brown, with eleven transverse ridges, slightly salient in lateral view, oval in ventral view, apex slightly prominent in dorsal view relative to supra-antennal plates. Central sulcus slender. Spaces between transverse grooves brown. Anteclypeus and carina black. Lorum black with setae. Rostrum with brown mentum and a dark borwn labium. Labium short, reaching the posterior margin of basisternum 3.
Pronotum (Fig. 79) narrower than mesonotum (except pronotal collar) with black band with anterior margin sinuous in middle of ambient fissure. Anterior margin of pronotum stained in black. Paranota convex and narrow, visible in dorsal view. Mesonotum (Fig. 79) with submedian and lateral sigillae black. Lozenge-shaped black band present between sigillae reaching the scutellum. Scutellum with posterior projections forming an obtuse angle, apices slightly acute with blond setae. Epimeral lobe reaching the anteromedian margin of operculum. Anepimeron 2 shorter than epimeral lobe in ventral view. Basisternum 3 (Fig. 80) with well-developed protuberances relative to median insertion, protuberances apices spaced, posterior margin of basisternum 3 straight, anterior margin straight. Operculum (Fig. 81) triangular, apex not closing tympanal cavity. Lateral margin of operculum convex, posterior margin straight, internal angle wide and widely separated. Meracanthus does not reach posterior opercular margin. Gutter present only on distal lateral margin of operculum. Profemora armed with three spines, primary round at apex and leaning forward, secondary sharp and straight, apical straight and shorter than others. Three segmented tarsi. Wings hyaline. Fore wings with median vein divergent to cubitus anterior vein, basal cell entirely opaque, apical cell 2 shorter than 1 and 3, medial crossvein oblique. Hind wings with basal area brownish, radius vein arched.
Abdomen subcylindrical, the length equivalent to combined length of head and thorax in dorsal view. Timbal cover (Fig. 78) tumid, apex rounded reaching the lateral metascutellar plate, medial margin concave partly covering timbals. Tergite 1 visible. Sternite I not visible in ventral view. Posterior margin of sternite II concave. Median projection of sternite II almost reaching the posterior limit of metacoxae. Sternite VII (Fig. 82) subrectangular with lateral margin slightly convex and posterior margin emarginate forming two acute apices. Sternite VIII ogive-shaped.
Pygofer (Fig. 83) with rounded distal shoulder. Basal lobe of pygofer short, not reaching the lateral uncus lobes. Uncus (Fig. 108) without spines, anterior margin long, protuberant. Median uncus lobe long and triangular in ventral view. Lateral lobes large and obtuse, expanded laterally in ventral view. Lateral uncus lobes elongated in posterior view. Protuberance of basal plate near from apex of basal lobe. Basal curve of aedeagus short, near to lateral lobes. Theca (Figs. 84, 85) dorsally developed forming a sclerotized filament attached to vesica and extending beyond apex. Vesica originates in fissure at theca, extruded at apex with a lateral projection forming the gonopore.
Measurements (mm). Holotype ♂. (lb): 24.09; (wh): 12.57; (lh): 4.20; (wp): 12.18; (lp): 5.20; (wm): 10.21; (lm): 9.22; (lfw): 39.87; (wfw): 12.94; (whw): 9.07; (lhw): 18.48.
Distribution. Brazil (Amazonas).
description: Published as part of Ruschel, Tatiana Petersen, 2017, Seven new species of the cicada genus Guyalna Boulard & Martinelli, 1996 (Hemiptera: Cicadidae: Fidicinini) with a re-description of the type species, pp. 246-279 in Zootaxa 4281 (1) on pages 269-272, DOI: 10.11646/zootaxa.4281.1.25, http://zenodo.org/record/816099