Nosoarna, Ruschel & Sanborn, 2021

Ruschel, Tatiana P. & Sanborn, Allen F., 2021, Two new genera and species of Fidicinini Distant, 1905 with a re-description of Nosola Stål, 1866 (Hemiptera, Auchenorrhyncha, Cicadidae), Zootaxa 4920 (4), pp. 509-527 : 516-518

publication ID

https://doi.org/10.11646/zootaxa.4920.4.3

publication LSID

lsid:zoobank.org:pub:22E8AB54-654D-4882-9084-41F0D229D010

DOI

https://doi.org/10.5281/zenodo.4491185

persistent identifier

https://treatment.plazi.org/id/03D787C8-EC4D-FFC7-FFE0-5B45FDD435B1

treatment provided by

Plazi

scientific name

Nosoarna
status

n. gen.

Nosoarna n. gen.

( Figs. 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7 )

Type species. Nosoarna albipilosa n. gen., n. sp.

Species included. Nosoarna albipilosa n. gen., n. sp.

Remarks. At first glance, the genus appears to be a combination of a head from a species of Nosola with the wings and body of a Proarna Stål, 1864 . It lacks the characteristic forewing of Nosola and no species of Proarna has a head with the postclypeus protruding anteriorly as it does in this new genus along with other differences in these genera.

Etymology. The name is a combination of Nosola and Proarna , two genera that share similar characteristics with the new taxon. The genus is feminine.

Description. Medium sized cicada (body length about 23–26 mm).

Head wider than anterior pronotum about as wide as mesonotum, eyes not as wide as anterior pronotal collar. Vertex at area of ocelli shorter than front, front angled ventrally between vertex and frontoclypeal suture, ocelli well developed, almost reaching anterior margin of pronotum, lateral ocelli closer to each other than to eyes, higher than median ocellus in frontal view, ocular tubercle well developed ( Fig. 5B View FIGURE 5 ). Supra–antennal plates not prominent relative to anterior margin of head, not reaching half distance to eye ( Fig. 5B View FIGURE 5 ). Postclypeus more prominent than anterior margin of head, longer than remaining head, twice the length of the supra–antennal plate in dorsal view, tumid in dorsal view with curved apex ( Fig. 5B View FIGURE 5 ), rectangular in ventral view ( Fig. 5C View FIGURE 5 ), obtusely angled in lateral view, central sulcus slender, transverse grooves prominent. Anteclypeus with ventral surface tumid, posterolateral margins inclined forming an acute angle, posterolateral flaps absent ( Fig. 5C View FIGURE 5 ). Pronotum shorter than mesonotum; paramedian fissure narrow and shallow; pronotal collar dorsally narrow, widening laterally, lateral angle projected laterally wider than lateral margin of mesonotum; lateral margin convex ( Fig. 5A, B View FIGURE 5 ). Mesonotum covering dorsal metanotum, cruciform elevation swollen medially, posterior arms shorter than anterior arms, lateral regions flattened, posterior margin slightly arched ( Fig. 5A, B View FIGURE 5 ). Anterior basisternum 3 obtusely angled, not prominent relative to mesocoxae ( Fig. 5D View FIGURE 5 ); three segmented tarsi; wings hyaline; forewings with apical cell 2 half-length of apical cell 1; costal margin smoothly curved, costal vein slightly distant from radius + subcostal vein, radial and radiomedial crossveins not parallel ( Fig. 5A View FIGURE 5 ). Male operculum semilunar, meracanthus short, not reaching half operculum length ( Fig. 5E View FIGURE 5 ). Female operculum triangular, smaller than male ( Fig. 7C View FIGURE 7 ). Male abdomen subcylindrical, tergite 1 visible, length equivalent to median projection of tergite 2, but longer than cruciform elevation ( Fig. 5A View FIGURE 5 ). Timbal cover flat, incomplete, timbal exposed ( Fig. 5F View FIGURE 5 ). Male sternite I twice metacoxae length, sternite I swollen medially, and sternite VII sub–rectangular ( Fig. 5D View FIGURE 5 ). Female sternite VII rectangular, wider than long, posterior margin with a single notch ( Fig. 7E View FIGURE 7 ). Medial epipleurites slightly reflexed dorsally ( Figs. 5G View FIGURE 5 ; 7E View FIGURE 7 ). Pygofer distal shoulder anterior margin terminating in acute projection ( Fig. 6C View FIGURE 6 ), dorsal beak absent, pygofer upper lobe absent, pygofer basal lobe well-developed ( Fig. 6B, C View FIGURE 6 ). Uncal dorsal crest developed and projected posteriorly; median uncus lobe absent; lateral branches of uncus anteriorly projected; ventral apophyses fused with lateral branches of uncus ( Fig. 6A, B View FIGURE 6 ). Theca tubular opened medially, apex with long, slender vesica, cornuti present, spine of vesica present, thecal and vesical processes absent ( Fig. 6D, E View FIGURE 6 ).

Measurements (mm). Length of body: 23.96–25.80; length of forewing: 35.97–36.69; width of forewing: 10.11–11.71; length of head: 3.33–3.96; width of head including eyes: 7.92–8.46; width of pronotum including suprahumeral plates: 9.36–10.08; width of mesonotum: 8.10–8.46.

Diagnosis. The genus can be distinguished from all other genera in Fidicinini by the following combination of characters: head including eyes broader than anterior pronotum; postclypeus more prominent than anterior margin of head, swollen, anterior margin curved in dorsal view; ventral anteclypeus tumid, posterolateral margins inclined forming acute angle, posterolateral flaps absent; anterior basisternum 3 obtusely angled, not prominent relative to mesocoxae; male operculum semilunar with curved posterolateral margin, female operculum triangular; three segmented tarsi; forewings with apical cell 2 half-length of apical cell 1; costal margin smoothly curved, costal vein slightly distant from radius + subcostal vein; uncal dorsal crest projected posteriorly with a midline; median uncus lobe absent; apex of lateral branch of uncus with lateral and internal margins tightly concave; theca a long tube opened medially, cornuti present, spine of vesica present, thecal and vesical processes absent, cornuti present, spine of vesica present. The genus is similar to Nosola due the postclypeus being more prominent than the anterior margin of the head, and to Proarna due the shape of the wings, the semilunar male operculum, the timbal cover shape and the white setae covering the body dorsally and body and wings ventrally. Nosoarna n. gen. can be distinguished from these two genera by the long frontoclypeal suture forming an obtuse angle in dorsal view, the costal vein not arched, and the uncus with an uncal dorsal crest projected posteriorly with a midline and a lateral branches of uncus anteriorly projected.

Distribution. Bahia ( Brazil).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Cicadidae