Dilobopterus segmentalis ( Signoret, 1853 )

Quintas, Victor, Felix, Márcio, Lima, Douglas Felipe Dos Santos & Mejdalani, Gabriel, 2017, Two new species of Dilobopterus Signoret, 1850 and the male of D. segmentalis (Signoret, 1853) from Southeastern Brazil, with taxonomic notes on the genus (Hemiptera: Cicadellidae: Cicadellini), Zootaxa 4281 (1), pp. 127-134 : 131-133

Dilobopterus segmentalis ( Signoret, 1853)

( Figures 17–25 , 28 )

Tettigonia segmentalis Signoret, 1853: 345 , pl. 10, fig. 1. Female lectotype from “San Paolo” designated by Young & Beier (1963: 573), deposited at NHMW (photograph of the body in dorsal view provided by Wilson et al. 2009). Tettigonia approximata Stål, 1862: 39 . Female lectotype from “Brasil” [“Rio Janeiro”] designated by Young (1963: 224), deposited at NHRS (junior synonym proposed by Young 1977: 109).

Total length 8.6–9.0 mm (males, n = 2), 9.2 mm (female, n = 1).

Male. Head ( Figs. 17 , 28 ) well produced anteriorly; antennal ledges, in lateral view, with anterior margin oblique and convex; frons with distinct muscle impressions and median portion with granular texture. Hind legs with meron not exposed. Other features of head and thorax much as described above for D. nelsoni sp. nov.

Color ( Figs. 17 , 28 ). Ground color of anterior dorsum greenish-yellow with complex, symmetrical pattern of dark brown to black spots and lines as shown in Figs. 17 and 28 ; pronotum broadly dark brown laterally and on posterior margin, with large greenish-yellow or green area centrally and irregular dark brown to black marks distributed transversally near anterior margin; mesonotum with dark brown to black mark on anterior margin, anteromedian line and scutoscutellar suture dark brown to black. Forewings brown to dark brown, translucent, with large greenish-yellow area at base of clavus, large subrectangular vitreous area on basal half extending from costal margin to apical portion of clavus, allowing observation of large transverse yellow areas of abdominal tergum, apical third near apex of anteapical cells with or without large, transverse greenish-yellow mark extending from costal margin to inner margin of first apical cell. Ground color of face dark brown to black; laterosuperior area of frons and most of gena yellow. Thorax laterally mostly yellow, ventrally mostly dark brown to black. Legs yellowish-brown to dark brown. Abdomen, in ventral view, dark brown to black, laterotergites mostly yellow.

Male genitalia. Pygofer ( Figs. 18–19 ), in lateral view, strongly produced posteriorly; posterior margin convex; with small dentiform process on median portion of ventral margin (arrow in Fig. 19 ); ventral margin with microsetae along basal half up to location of dentiform process; disc with numerous dispersed macrosetae absent only on basal fourth. Subgenital plates ( Fig. 20 ), in ventral view, subtriangular, elongate but not extending as far posteriorly as pygofer apex; separated from each other throughout their length; with multiseriate macrosetae, microsetae also present. Connective ( Fig. 21 ), in dorsal view, T-shaped but with stalk directed dorsoanteriorly; stalk without median keel. Style ( Fig. 21 ), in dorsal view, extending posteriorly distinctly farther than apex of connective; with preapical lobe; apex finger-shaped, directed outwards. Aedeagus ( Fig. 22 ) symmetrical; shaft, in lateral view, with pronounced dorsal lobe; without processes; gonoduct distinct; gonopore located apically. Paraphyses ( Figs. 23–24 ) rami with numerous conspicuous setae on apical portion.

Female with posterior margin of sternite VII ( Fig. 25 ), in ventral view, broadly concave; this sternite with lateral portions yellow and central portion dark brown to black.

Known distribution. Atlantic Forest , Southeastern Brazil, states of Espírito Santo (specimens herein examined), Rio de Janeiro ( Mejdalani et al. 2009), and São Paulo ( Signoret 1853, Young & Beier 1963).

Material examined. Two males: “BR/ES [Espírito Santo State], Santa Teresa , \ RESBIO Santa Lucia [Lúcia]\ 04/VIII/2007 \ R. A. CARVALHO Col.” and “BR/ES, Santa Teresa \ 24-28/VI/2009 \ R. CARVALHO, A. CARPI, L. \ NOGUEIRA & M. LOPES COL .” (MNRJ). One female: “BR/ES, Santa Teresa \ Estação Biológica Santa \ Lúcia 21- 22/II/2008 \ S. BUYS Col .” (MNRJ).

Taxonomic notes. Our interpretation of D. segmentalis is based on a photograph of the female lectotype ( Wilson et al. 2009) and an illustration of its sternite VII provided by Young (1977: 110, fig. 68i). The latter author studied only two females of this species. Males described herein of D. segmentalis key to D. trinotatus in Young’s (1977) key to the species of Dilobopterus . However, they can be easily distinguished because D. trinotatus has brown forewings with three large, transverse yellow marks ( Fig. 29 ), one at the base, one at the median third, and the last at the apical third (see also Wilson et al. 2009). Also, D. trinotatus has no subrectangular vitreous area on the forewings as observed in D. segmentalis and D. sakakibara ( Figs. 10 , 27–28 ). This vitreous area, as well as the peculiar form of the connective ( Figs. 13 , 21 ), suggests that the latter two species are closely related within the trinotatus group.

Additional material examined. Dilobopterus trinotatus ( Signoret, 1853) . One male: “ BRASIL – RJ [Rio de Janeiro State] \ Parque Nac. do Itatiaia\ 06/XI/2009 \ M.A & M.L. Monné col.” ( MNRJ) . One female: “BR/RJ/ R. Janeiro / \ Floresta da Tijuca \ 12/XI/2005 \ M. Wilson; G. Mejdalani \ & A. Leal Col. ” ( MNRJ) .

Figures

FIGURES 17 – 25. Dilobopterus segmentalis (Signoret, 1853). 17, head, pronotum, and mesonotum, dorsal view. 18 – 24, male genitalia. 18, pygofer, lateral view. 19, pygofer ventral margin (arrow indicates location of small dentiform process), ventral view. 20, valve and subgenital plate, ventral view. 21, connective and style, dorsal view. 22, ejaculatory reservoir, aedeagus, and basal segment of anal tube, lateral view. 23, paraphyses, laterodorsal view (setae of one ramus omitted). 24, paraphyses, dorsal view. 25, apical portion of female abdomen, ventral view. Scale bars = 1 mm.

FIGURES 26 – 29. Body in dorsal view (antennae and legs not depicted). 26, Dilobopterus nelsoni sp. nov., male holotype (total length 6.7 mm). 27, D. sakakibara sp. nov., male holotype (t. l. 6.9 mm). 28, D. segmentalis (Signoret, 1853), male (t. l. 9.0 mm). 29, D. trinotatus (Signoret, 1853), female (t. l. 9.0 mm). The last three species belong to the trinotatus group (see text for details).

FIGURES 9 – 16. Dilobopterus sakakibara sp. nov. 9, head, pronotum, and mesonotum, dorsal view (male paratype). 10, forewing. 11 – 16, male genitalia. 11, pygofer, lateral view. 12, valve and subgenital plate, ventral view. 13, connective and style, dorsal view. 14, ejaculatory reservoir and aedeagus, lateral view. 15, paraphyses, laterodorsal view (setae of one ramus omitted). 16, paraphyses, dorsal view. Scale bars: 9 = 1 mm, 10 = 2 mm, 11 – 16 = 0.5 mm.