Hoplonannus australis Silveira and Knyshov, 2019

Silveira, Diego Dutra, Barcellos, Aline & Knyshov, Alexander, 2019, Hoplonannus australis sp. nov. (Hemiptera, Schizopteridae): amended diagnosis of the genus and first record from South America, Zootaxa 4568 (2), pp. 394-400 : 395-400

Hoplonannus australis Silveira and Knyshov sp. nov.

( Figs. 1–14 )

Diagnosis. Male and female submacropterous, both bearing ocelli. General colour castaneous. Hemelytra with second discal cell rectangular and discal cell pentagonal. Hind wings with anal margin angulate; jugal lobe absent. Male genitalia exhibiting dextral asymmetry; eighth tergite with a lanceolate process, reaching the base of the aedeagus. Anophoric process very long, tapering distally. Right paramere branching near apex, branches subparallel. Female with a prominent basal bulge at the base of seventh sternite; ninth tergite mesially notched; female ovipositor vestigial.

Description. Male. Color ( Figs. 1–3 ). Head and scutellum dark castaneous, thorax castaneous, lighter than head. Abdominal tergites light yellow, sternites light castaneous. Legs light yellow, with darker tarsi. Hemelytra: corium castaneous, membrane light yellow.

Head. Declivent, ocelli present ( Fig. 3 ). Paired macrosetae close to ocular region. Scape and pedicel each with less than one fourth the length of each flagellomere. Flagellomeres I and II straight, of the same length; setae long and thin present on apical half of I and along entire II, become longer towards apex of antenna. Labium surpassing first pair of legs, not reaching the second; segment III apically truncate; segments ratio 2:1:2 ( Fig. 7 ).

Thorax. Pronotum without collar, with scattered setae all over the disc, posterior margin slightly convex. Scutellum about half the length of the pronotum, anterior margin slightly sinuate. Femora with scarce setae along all their length; tibiae with two lateral rows of setae; tarsal formula 3-3-3. Hemelytra with second discal cell rectangular and discal cell pentagonal ( Fig. 8 ). Hind wings with anal margin angulate ( Fig. 9 ).

Abdomen. Seventh segment asymmetric, produced unilaterally in a short process ( Fig. 1 ); eighth tergite bearing a moderately long, lanceolate process, reaching the base of the aedeagus. Genital capsule broadly visible dorsally, exhibiting dextral asymmetry ( Fig. 10 ). Anophoric process very long, tapering distally. Right paramere long and branched apically, branches subparallel. Left paramere about half the length of right paramere. Aedeagus short, not completing a whole turn around right paramere.

Measurements (mm). Total length 1.2; Head length 0.1; interocular distance 0.4; antennal segments length I, 0.08; II, 0.08, III, 0.3; IV, 0.3; pronotum length 0.2; pronotum width 0.4; scutellum length 0.08; hemelytra length 0.8; abdominal width 0.6.

Female. Submacropterous ( Figs. 4–6 ), similar to the male, except by the tarsal formula 3-2-2 and the abdominal segments symmetric. Seventh sternite with a basal bulge and two posterior projections ( Figs. 5–6 ). Tergite 9 with a mesial notch. Ovipositor reduced, gonapophyses 8 very thin, long, and curved, widely separated at base, gonapophyses 9 thin, short, and straight, also widely separated at base, but close to each other at apex. Gonapophyses 8 and 9 not interlocking. Spermatheca located on right side of segment 8, spermathecal duct relatively short, straight, and narrow, spermathecal reservoir very narrow, roughly similar in size to spermathecal gland ( Figs. 11–14 ).

Remarks. This is the first species of Hoplonannus described from continental South America. Submacroptery and ocelli in females might be related to a more active habit, and are novel features for the genus (Table I). Also, the process of eighth tergite in males, mentioned as absent by Emsley (1969), is described for the first time in Hoplonannus. In her key to genera of the Corixidea genus group, Weirauch (2012) uses the supposed absence of this process in Hoplonannus, besides other traits, to distinguish from Voragocoris . However, the process exhibited for Hoplonannus australis sp. nov. is much longer and more lateral than the described and illustrated for Voragocoris Weirauch , while it is markedly shorter than in Corixidea . Possible homology hypotheses require further testing. A revision and cladistic analysis of all the genera of the Corixidea genus group is in preparation by the third author.

Material examined. Holotype ♂: BRAZIL, Rio Grande do Sul, Sant’ana do Livramento , 17.v.2012, R. Ott, I. Heydrich, M. Pairet, E. Velinho (MCNZ).

Paratypes: 2 ♂, 3 ♀, same local of the holotype, 15.xi.2012, same collectors ( MCNZ) ; 1 ♀, same data ( USNM) ; 2 ♀, same local, 14.xi.2012, same collectors ( MCNZ) ; 1 ♂, same data ( USNM) ; 1 ♀, same local, 14– 16.viii.2012, same collectors ( MCNZ) ; 1 ♀, same local, 16–18.viii.2012, same collectors ( MCNZ) ; 45 ♂, 3 ♀, ARGENTINA, Misiones Province, Candelaria Dept., Loreto, Ruinas Jesuiticas , 21–24.viii.2000, P. Fidalgo ( UCR) ; 5 ♂, same collection event ( MLPA) ; 27 ♂, same locality, 23.viii.2000, same collector ( UCR) ; 5 ♂, same collection event ( MLPA) ; 5 ♀, same locality, 25.viii.2000, same collector ( UCR) ; 2 ♀, same collection event ( MLPA) ; 1 ♀, PARAGUAY, Alto Parana Province , 1984?, uncertain collector ( MHNG) ; 2 ♂, 6 ♀, URUGUAY, Tacuarembo Dept. , 40 km NW of Tacuarembo, 11–26.xii.2002, S. B. Peck ( FMNH) .

TABLE I. Diagnostic traits among species of Hoplonannus.

Figures

FIGURE 10. Hoplonannus australis sp. nov., genital capsule under scanning electron microscopy (SEM), dorsal view (ae, aedeagus; ap, anophoric process; lp, left paramere; rp, right paramere; t8, eighth tergite; t8p, process of eighth tergite).

FIGURES 1–3. Hoplonannus australis sp. nov., male habitus: 1, ventral; 2, dorsal; 3, lateral (ae, aedeagus; lp, left paramere, oc, ocellus; rp, right paramere; s7p, process of seventh sternite; t8p; process of eighth tergite).

FIGURES 4–6. Hoplonannus australis sp. nov., female habitus: 4, dorsal; 5, ventral; 6, lateral (bb, basal bulge; gap8, gonapophysis 8; gap9, gonapophysis 9; oc, ocellus; pps7, posterior projection of seventh sternite).

FIGURES 7–9. Hoplonannus australis sp. nov.: 7, head and part of prothorax under scanning electron microscopy, ventral view; 8, 9, hemelytrum and hind wing, respectively (ala, angle of anal lobe; bc, buccula; cly, clypeus; cu, cubital vein; dc, discal cell; fr, frons; lb1, lb2, lb3, first, second and third labial segments; lr, labrum; M, media; M1, first medial vein; M2, second medial vein; ms, muscle scars; pcu, post cubital vein; R, radius; Sc, subcosta; tc, trapezoidal cell; 1An, anal vein).

FIGURES 11–14. Hoplonannus australis sp. nov., female genitalia, dissected, lateral (11, 13) and ventral (12, 14) views (gap8, gonapophysis 8; gap9, gonapophysis 9; spd, spermathecal duct; spg, spermathecal gland; spr, spermathecal reservoir).