Barolineocerus elongatus 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 : 475-477

Barolineocerus elongatus Freytag, 2008

( Figs. 4D–F , 14A–M )

Barolineocerus elongatus Freytag, 2008: 52 , figures 6, 11–13.

Type locality: Reserva Natural Mosiro Itájura (Caparú) Igapo, Vaupés, Colombia .

Diagnosis (based on material collected in Brazil). Pronotal macula almost extends to hind margin of pronotum ( Fig. 4D ). Claval macula extends to scutellum apex ( Fig. 4D ). Abdominal sternite II apodeme extending slightly beyond posterior margin of sternite III ( Fig. 14C ). Pygofer posterior margin with ventral process; without median process ( Figs. 14C–D ). Valve with anterior margin sinuous and posterior one straight ( Fig. 14E ). Subgenital plate without dorsal process; apex abruptly pointed ( Figs. 14F–G ). Aedeagus with dorsal median process; without dorsal subapical ridge; with ventral transverse ridge at median third of shaft ( Figs. 14K–M ). Anal tube, laterobasal process with base sinuous at anterior margin, apex distinctly pointed ( Figs. 14C–D ).

Measurements (mm). Males (n= 3), total length (to apex of forewing): 4.59–4.94; median length of crown: 0.18–0.19; length of crown close to eyes: 0.15–0.17; width of head: 1.66–1.79; width of crown between eyes: 0.98–1.11; length of pronotum: 0.51–0.62; length of scutellum: 0.93–1.14; width of pronotum: 1.54–1.69; width of scutellum: 1.18–1.34; length of face: 1.12–1.19; width of face between eyes: 1.00–1.08; distance between ocelli: 0.35; ocellocular distance: 0.30–0.32; length of clypeus: 0.38–0.43; basal width of clypeus: 0.25–0.27; apical width of clypeus: 0.34–0.35; length of forewing: 3.89–4.20.

Distribution. Brazil (Amazonas); Colombia (Vaupés).

Additional material. Brazil: 1♂, “Brasil, AM [ Amazonas ], Novo Airão \ AM 352 Ramal km 10\ 02º42'56.5"S 60º56'26.7"W;\ 29–30.viii.2011 \ Armadilha luminosa dossel,\ 21:00–24:00h. F.F.Xavier &\ A. Agudelo. ”, DZRJ ; 1♂, 1♀, same data as preceding, except: “ 29.viii.2011 \ Armadilha luminosa móvel,\ 00:00–03:00h. J.A.Rafael \ D.Takiya & J.T.Câmara. ”, INPA ; 1♂, “ BRAZIL: Amazonas , Barcelos \ Rio Padauari , Ararão / Ararinha \ 00.50487ºN 064.05831ºW \ Takiya, Cavichioli & Rafael et al. ”, “ 07–08.vi.2010 \ Luz Sub-bosque\ Hora: 03–06h”, 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. elongatus . Freytag (2008) mentions the presence of a ventral spine in the middle of the shaft, but we interpret this projection as a transverse ridge rather than a spine-like process ( Figs. 14K–M ). In addition, Freytag (op. cit.) states that the apices of the basolateral processes of the anal tube are truncate, but we interpret them as pointed ( Figs. 14C–D ). Some specimens collected in Brazil have the apical yellow portion of the scutellum discontinuous from the remaining portions of the posterolateral macula (as in Fig. 4D ). Specimens vary in the hind tibia AD row with 6–7 cucullate setae and PD row with 16 cucullate setae.

Barolineocerus elongatus is most similar to B. apiculus and B. spinosus as mentioned in the Remarks on B. apiculus . However, it can be distinguished from these species by the sinuous anterior margin of the valve ( Fig. 14E ), pygofer anterodorsal apodeme longer than half length of pygofer ( Fig. 14C ), and the ventral transverse ridge present on the median third of the aedeagal shaft ( Figs. 14K–M ).

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 14. Barolineocerus elongatus Freytag, 2008, male from Brazil, Amazonas, 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–L= 0.2 mm, M= 0.1 mm.