Barolineocerus digitatus, Praciano & Dietrich & Takiya, 2025

Praciano, Daniel Lucas, Dietrich, Christopher H. & Takiya, Daniela Maeda, 2025, Taxonomic revision of the Neotropical leafhopper genus Barolineocerus Freytag, 2008 (Hemiptera: Cicadellidae: Eurymelinae: Chiasmodolini), with descriptions of three new species and an updated key to species, Zootaxa 5653 (4), pp. 451-485 : 473-475

Barolineocerus digitatus sp. nov.

( Figs. 4A–C , 13A–M )

Type locality. Km-25, BR 156, Oiapoque, Amapá, Brazil.

Diagnosis. Pronotal macula extends to anterior half or almost to hind margin of pronotum ( Fig. 4A ). Claval macula extends distinctly beyond scutellum apex ( Fig. 4A ). Abdominal sternite II apodeme extending to posterior margin of sternite III ( Fig. 13B ). Pygofer posterior margin with short ventral process; with long and slender median process, sinuous, extending to anal tube, sharply pointed at apex, apex distinctly divergent then it bends internally ( Figs. 13C–D ). Valve with anterior margin sinuous and posterior one convex ( Fig. 13E ). Subgenital plate without dorsal process; apex rounded ( Figs. 13F–G ). Aedeagus with dorsal median process; without dorsal subapical ridge; with ventral transverse ridge at apical fourth of shaft ( Figs. 13K–M ). Anal tube, laterobasal process with base sinuous at anterior margin, apex distinctly pointed ( Figs. 13C–D ).

Measurements (mm). Holotype male, total length (to apex of forewing): 3.96; median length of crown: 0.24; length of crown close to eyes: 0.20; width of head: 1.43; width of crown between eyes: 0.73; length of pronotum: 0.37; length of scutellum: 0.70; width of pronotum: 1.30; width of scutellum: 0.97; length of face: 0.93; width of face between eyes: 0.77; distance between ocelli: 0.34; ocellocular distance: 0.19; length of clypeus: 0.30; basal width of clypeus: 0.21; apical width of clypeus: 0.27; length of forewing: 3.08. Males (n= 10), total length (to apex of forewing): 3.46–4.09; median length of crown: 0.24–0.36; length of crown close to eyes: 0.22–0.32; width of head: 1.41–1.53; width of crown between eyes: 0.73–0.81; length of pronotum: 0.35–0.53; length of scutellum: 0.70–0.84; width of pronotum: 1.30–1.37; width of scutellum: 0.96–1.07; length of face: 0.80–1.01; width of face between eyes: 0.76–0.80; distance between ocelli: 0.30–0.34; ocellocular distance: 0.19–0.21; length of clypeus: 0.29–0.33; basal width of clypeus: 0.20–0.21; apical width of clypeus: 0.26–0.29; length of forewing: 3.08–3.44.

Coloration (holotype). Body color ( Figs. 4A–C ) following genus description, with following exceptions. Clypeus and lora light brown ( Fig. 4C ). Gena light brown near lora and eyes, white laterally ( Fig. 4C ). Rostrum light yellow ( Fig. 4C ). Pronotum brown with yellow median semicircular macula short, extended about 1/3 of pronotum length, with posterolateral margins straight with brown line not reaching posterior margin ( Fig. 4A ). Scutellum brown; apical yellow portion of the scutellum discontinuous from the remaining portions of the posterolateral macula ( Fig. 4 AB). Forewing claval macula extends distinctly beyond scutellum ( Fig. 4A ).

Description (holotype). Crown short, median length 0.77x shorter than interocular width; slightly wider (1.1x) than pronotum. Face 1.2x longer than width between eyes; distance between ocelli 1.84x longer than ocellocular distance. Clypeus 1.24x wider apically than basally. Pronotum 3.5x longer than wide; 1.54x longer than crown. Scutellum approximately 1.4x wider than long. Hind tibia AD row with 6 cucullate setae; PD row with 13 cucullate setae. Other characters as in generic description.

Male terminalia. Pygofer triangular, in lateral view; posterior margin with short ventral process and long and slender median process, with basal 3/5 somewhat straight directed caudal-dorsally, then it bends posteriorly (but not 90º angle), median portion parallel, abruptly divergent on apical third, then it bends again internally, do not touching or crossing each other ( Figs. 13C–D ). Valve with anterior margin concave and posterior margin strongly posteriorly projected ( Fig. 13E ). Subgenital plate reniform, in lateral view; without dorsal process; apex rounded in lateral view, strongly dorsally curved ( Figs. 13F–G ). Connective stem short and broad; with median constriction ( Figs. 13H–I ). Style slender and long; apex somewhat pointed ( Figs. 13H, J ). Aedeagus with dorsal median process, without dorsal subapical ridge; ventral transversal ridge at apical fourth ( Figs. 13K–M ). Anal tube, laterobasal process with base sinuous at anterior margin, apex without angulate at anterior margin ( Figs. 13C–D ).

Etymology. The specific epithet refers to the unusual hook-shaped (digit) shape of pygofer process apex ( Figs.

13C–D).

Remarks. Paratypes have hind tibia AD row with 5–6 cucullate setae and PD row with 9–16 cucullate setae. Notably, in some specimens from Brazil, the gena and lora are brown, but they are black in some specimens from French Guiana. In some specimens from Brazil and French Guiana the pronotum median semicircular macula extends about 1/2 of the pronotum length.

Barolineocerus digitatus sp. nov. shares affinities with B. chiasmus , B. furcatus , B. ornatus , B. chicomendesi sp. nov., and B. dercyae sp. nov. as mentioned earlier. It closely resembles B. chiasmus , B. chicomendesi sp. nov., and B. ornatus , featuring an aedeagus with a transverse ridge on the ventral margin of the shaft ( Figs. 13K–L ). However, it distinguishes itself from these species by the simple hook-shaped apex of the posterior pygofer processes ( Figs. 13C–D ).

Distribution. Brazil (Amapá); French Guiana ( Régina, Saül ).

Type material. 1♂, holotype, “ BRASIL, Amapá, Oiapoque, BR 156,\ km-25, 3º39'35"N – 51º46'17"W,\ 05– 27.x.2019, Malaise grande, em\ floresta, J.A.Rafael, S.Lima, F.F.Xavier ”, DZRJ .

Paratypes: 1♂, same data as holotype, except: “ 7–20.x.2019, Malaise grande, em\ floresta, J.A.Rafael, S.Lima, F.F.Xavier ”, DZRJ ; 1♂, same data as preceding, except: “ 15–28.ii.2020, Malaise grande, em\ floresta, J.A.Rafael, S.Lima, F.F.Xavier ”, MNRJ ; 2♂, same data as preceding, except: “ iii–viii.2020, Malaise grande, em\ floresta, J.A.Rafael, S. Lima, F.F.Xavier, MNRJ ; 2♂, same data as preceding, except: “ 10–23.viii.2019, Malaise grande, em\ floresta, J.A.Rafael, S.Lima, F.F.Xavier ”, MNRJ ; 2♂, same data as preceding, except: “ 24.viii–6.ix.2019, Malaise grande, em\ floresta, J.A.Rafael, S.Lima, F.F.Xavier ”, INPA ; 1♂, 1♀, “ BRASIL; “AP: Oiapoque , Estrada \ p/ Vitória do Oiapoque,\ INFRAERO\ Malaise \ xi-2014 \ J.A. Rafael e F.F. Xavier Fº”, DZRJ . FRENCH GUIANA: 1♂, 1♀, “French Guiana: [ Régina ] Petite Montagne Tortue\ 04°19'14.1N – 052°14'27.5W \ Flooded forest \ Automatic light trap \ 6.x.10\ G. Lamarre leg.”, DZRJ ; 1♂, same data as preceding, except: “ Malaise line G\ 10.xi.10\ G. Lamarre leg.”, DZRJ ; 1♂, 1♀, same data as preceding, except: “ Terra Firme ,\ Light trap \ 08.ix.10\ G. Lamarre leg.”, MNRJ ; 1♂, same data as preceding, except: “ White sand\ Light trap \ 12.ix.10\ G. Lamarre leg.”, MNRJ ; 1♂, same data as preceding, except: “ Malaise line D\ 24.ii.10\ G. Lamarre leg.”, DZRJ ; 1♂ 1♀, “French Guiana: Bélvédère\ de Saül, 3°37'22"N 53°12'57"W, alt. 326 m \ Automatic light trap \ 6–15.ix.11 \ SEAG [ Société Entomologique Antilles Guyane ] leg.”, DZRJ ; 1♂, same data as preceding, MNRJ .

Figures

FIGURE 4. Barolineocerus habitus. A, D, G, dorsal habitus. B, E, H, lateral habitus. C, F, I, face, ventral view. A–C, Barolineocerus digitatus sp. nov. specimen from Brazil, Amapá. D–F, Barolineocerus elongatus Freytag, 2008 specimen from Brazil, Amazonas. G–I, Barolineocerus ornatus Freytag, 2008 specimen from Brazil, Roraima. J–L, Barolineocerus spinosus Freytag, 2008 specimen from Brazil, Acre. Scale bars: A–B, D–E, G–H, J–K= 1.0 mm; C, F, I, L: 0.5 mm.

FIGURE 13. Barolineocerus digitatus sp. nov., male from Brazil, Amapá, INPA. A, forewing. B, apodemes of sternite II, dorsal view. C, pygofer and anal tube, lateral view. D, pygofer and anal tube, posterior view. E, valve, ventral view. F, subgenital plate, lateral view. G, subgenital plate, ventral view. H, connective and style, dorsal view. I, connective, lateral view. J, style, lateral view. K, aedeagus, lateral view. L, aedeagus, posterior view. M, aedeagus shaft in detail, posterior view. ADS: aedeagal dorsal median spine. Scale bars: A= 1.0 mm, B–G= 0.2 mm, H–M= 0.1 mm.