Barolineocerus acius Freytag, 2008

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 : 457-459

Barolineocerus acius Freytag, 2008

( Figs. 2A–C , 5A–M , 6A–G )

Barolineocerus acius Freytag, 2008: 53 , figures 4, 17–19.

Type locality: Posadas Amazonas Lodge, at Rio Tambopata , near Puerto Maldonado, Madre de Dios, Peru .

Diagnosis (based on material collected in Brazil and Peru). Pronotal macula almost extends to hind margin of pronotum ( Fig. 2A ). Claval macula extends to or slightly beyond scutellum apex ( Fig. 2A ). Abdominal sternite II apodeme extending slightly beyond posterior margin of sternite III ( Fig. 5B ). Pygofer posterior margin with short ventral process; without median process ( Figs. 5C–D ). Valve with anterior and posterior margins straight ( Fig. 5E ). Subgenital plate without dorsal process; apex pointed ( Figs. 5F–G ). Aedeagus with dorsal median process; without dorsal subapical ridge; with pair of preapical ventral spine-like processes near base of gonopore ( Figs. 5K–M ). Anal tube, laterobasal process with base sinuous at anterior margin, apex distinctly pointed ( Figs. 5D–E ).

Measurements (in mm). Males (n=3) total length (to apex of forewing): 4.53–4.67; median length of crown: 0.16–0.25; length of crown close to eyes: 0.16–0.25; width of head: 1.68–1.79; width of crown between eyes: 1.00–1.03; length of pronotum: 0.52–0.65; length of scutellum: 0.90–1.20; width of pronotum: 1.58–1.67; width of scutellum: 1.25–1.32; length of face: 1.09–1.17; width of face between eyes: 0.99–1.03; distance between ocelli: 0.32–0.37; ocellocular distance: 0.26–0.30; length of clypeus: 0.38–0.44; basal width of clypeus: 0.24–0.26; apical width of clypeus: 0.32–0.37; length of forewing: 3.75–3.98.

Female genitalia (single specimen dissected). Sternite VII, about 2x wider than long ( Fig. 6B ). Pygofer higher than long, in lateral view; with sparse microsetae, without macrosetae ( Fig. 6A ). First valvifer about 1.5x longer than high ( Fig. 6C ). First valvula with dorsal sculptured area on apical half, with sculpturing elongate derived from a striated pattern ( Fig. 6C ); tapered towards the apex, apex rounded ( Fig. 6D ). Second valvifer about five times higher than long ( Fig. 6G ). Second valvula, dorsal margin with 19 teeth, without denticles, in lateral view; duct area with maculose sculpturing; ventral margin slightly membranous ( Fig. 6E ); apex with small denticles ( Fig. 6F ). Gonoplac with sparse microsetae distributed along ventral margin, in lateral view; without macroseta; apex rounded ( Fig. 6G ).

Distribution. Brazil (Acre, Amazonas, Rondônia); Ecuador (Orellana); Peru (Madre de Dios, Loreto).

Additional material. BRAZIL: 1♂,“Brasil, AM [Amazonas], Novo Airão \AM 352 Ramal km 10\ 02º42'56.5"S 60º56'26.7"W;\ 29.viii.2011 \ Armadilha luminosa móvel,\ 18:00–21:00h. J.A.Rafael \ D.Takiya & J.T.Câmara ”, DZRJ ; 1♂, 1♀, same data as preceding, except: “ 28.viii.2011 \ Armadilha luminosa dossel,\ 18:00–21:00h. F.F. Xavier&\ A. Agudelo”, INPA ; 1♂, “BRASIL, [Acre] Bujari, FES [Floresta Estadual]\ Antimary , 25–27.viii.2016 \ 9º20'01"S – 60º14'17"W \ Arm. [Armadilha] luz, AA Agudelo, FF\ Xavier, DMM Mendes, JA\ Rafael cols”, INPA ; 1♂, same data as preceding, DZRJ ; 1♂, 2♀ “BRASIL, RO [Rondônia], Porto Velho, ESEC [Estação Ecológica]\ Morro { Serra } Três Irmãos , Agrovila \ Linha 17, 20.viii.2016 \ 9º0'9"S – 64º32'40"W, Arm. [Armadilha]\ luz, DMM Mendes, FF Xavier\ AA Agudelo, JA Rafael cols.”, DZRJ . ECUADOR: 2♂, 1♀, “ECUADOR: ORELLANA Province,\ Reserva Étnica Waorani, Transect \ Ent. , 1km S. Onkone Gare Camp,\ 220m 00 o 39'10"S 076 o 26'00"W ", “ 09-Feb-1995 T.L.Erwin,\ et al., fogging, terra firme\ forest, lot#971”, INHS . PERU: 1♂, “ Peru: Loreto, Iquitos, Genaro \ Herrera , 4°55'00"S \ 73°36'49"W, terra firme\ 31.VII.11\ Window trap (V10)\ G. Lamarre leg”, DZRJ .

Remarks. Freytag (2008) provided illustrations of the male genital capsule (lateral view), subgenital plate (ventral view), connective, style and aedeagus (ventral view), and undissected female terminalia (ventral view) of B. acius . Some specimens collected in Brazil and Peru have the claval macula extended slightly beyond the scutellum apex. Specimens vary in the hind tibia AD row with 6–7 cucullate setae and PD with 14–18 cucullate setae.

Barolineocerus acius is most similar to B. bispinus due to the claval macula extending to scutellum apex; absence of an elongate median process on posterior margin of pygofer ( Fig. 2A ); acute apex of the subgenital plates ( Figs. 5F–G ); and presence of a preapical aedeagal pair of processes ( Figs. 5K–M ). However, it can be distinguished from the latter by the pair of ventral process on the pygofer posterior margin ( Fig. 5E ) and dorsal median process on the aedeagal shaft ( Fig. 5L ).

Figures

FIGURE 2. Barolineocerus habitus. A, D, G, dorsal habitus. B, E, H, lateral habitus. C, F, I, face, ventral view. A–C, Barolineocerus acius Freytag, 2008, specimen from Brazil, Amazonas. D–F, Barolineocerus apiculus Freytag, 2008, specimen from Brazil, Amazonas. G–I, Barolineocerus bispinus Freytag, 2008, specimen from Brazil, Amazonas. Scale bars: A–B, D–E, G–H= 1.0 mm; C, F, I: 0.5 mm.

FIGURE 5. Barolineocerus acius Freytag, 2008, male from Brazil, Amazonas, DZRJ. A, forewing. B, hindwing. C, apodemes of sternite II, dorsal view. D, pygofer and anal tube, lateral view. E, pygofer and anal tube, posterior view. F, valve, ventral view. G, subgenital plate, lateral view. H, subgenital plate, ventral view. I, connective and style, dorsal view. J, connective, lateral view. K, style, lateral view. L, aedeagus, lateral view. M, aedeagus, posterior view. N, aedeagus shaft in detail, posterior view. ADS: aedeagal dorsal median spine; AP: apodeme; Pr: process; PVP: pygofer ventral process. Scale bars: A–B= 1.0 mm, C–M= 0.2 mm, N= 0.1 mm.

FIGURE 6. Barolineocerus acius Freytag, 2008, female from Ecuador, Orellana, INHS.A, pygofer and anal tube, lateral view. B, sternite VII, ventral view. C, first valvifer and first valvula, lateral view. D, apical portion of first valvula, lateral view. E, second valvula, lateral view. F, apical portion of second valvula, lateral view. G, second valvifer and gonoplac, lateral view. Scale bars: A= 0.5 mm, B–G= 0.2 mm.