Ora bivittata Pic, 1922

Libonatti, María Laura, 2015, A revision of the genus Ora Clark, 1865 (Coleoptera: Scirtidae) in Argentina (part II) — redescriptions, updated distributions and a key to species, Zootaxa 3985 (1), pp. 69-97 : 75-77

Ora bivittata Pic, 1922

( Figs. 5 , 44–51 )

Ora bivittata Pic, 1922: 5

Type material. Holotype: not sexed ( MNHN), “Corumba / Matt Grosso” [white label, printed], “ Ora / bivittata / n sp” [white label, handwritten by Pic], “ HOLOTYPUS / Ora bivittata / Pic, 1922 ” [red label, printed].

Additional material studied. ARGENTINA: 1 ♂ (BR),“R EP ARGENTINA / Gob. Chaco / XII. 1894 / C. Bruch” [white label, printed], “ Ora / bivittata / Pic” [white label, handwritten by Bruch], “ Ora / bivittata Pic ” [white label, handwritten by Pic].

Diagnosis. Size very small, body oval, each elytron testaceous with a long brown vitta ( Fig. 5 ); tegmen slightly asymmetrical, with an apical digitiform outgrowth ( Fig. 50 ); penis slightly asymmetrical, rod-shaped, straight, flattened ( Fig. 51 ).

Redescription (based on the specimen from Chaco ex BR). Measurements. Male (n = 1): TL 2.82 mm, PL 0.58 mm, PW 1.35 mm, EL 2.30 mm, EW 2.05 mm.

Habitus. Broadly oval, depressed, maximum width at basal third of elytra, closely covered with yellowish setae ( Fig. 5 ).

Coloration. Head, antennomeres 1–3, pronotum, scutellar shield, legs and ventral surface reddish testaceous, basal half of hind femora brownish, elytra pale testaceous, each with a broad brown vitta on the disc extending from a little below the base to near the apex, antennomeres 3–11 brown.

Head. Rather wide, 2.0x wider than interocular space, clypeal surface flat; punctation very fine, dense, punctures separated by 1.0x diameter. Antennae filiform, with apical margins of antennomeres 4–10 slightly projected anteriorly, approximate ratio of antennomeres: 2.3: 1.2: 1.0: 2.0: 2.0: 2.0: 1.7: 1.7, approximate L/W ratios of antennomeres: 1.8, 1.2, 1.0, 1.5, 1.5, 1.5, 1.3, 1.3 (antennomeres 9–11 missing).

Thorax. Pronotum approximately 2.3x wider than long, anterolateral angles sharply projecting anteriorly, lateral margins rounded; punctation on pronotum and scutellar shield similar to that on head. Elytra depressed anterolaterally, humerus well marked, lateral margins rounded; punctation composed of very fine puctures separated by 1.0–2.0x diameter, with intermixed coarser punctures twice the size and separated by 3.0x diameter; elytra with a row of submarginal punctures parallel to the elytral suture. Mesoventral process elongate, very thin, with acute apex. Approximate length ratio of metatarsomere 1: dorsal metatibial spur: ventral metatibial spur: 3.6: 2.4: 1.0.

Abdomen. Completely covered with short yellowish setae except for a pair of glabrous oval regions on each side of the ventrites 2–5 ( Fig. 44 ). Ventrites 2–5 exhibiting long curved dark setae on lateral regions ( Fig. 45 ). Apex of ventrite 5 deeply concave ( Fig. 45 ).

Male terminalia and genitalia. Tergite 7 with posterior margin subtrapezoidal, covered with long setae over the central-posterior part, with very short apodemes ( Fig. 46 ). Tergite 8 with sclerotized apodemes converging posteriorly, with a sclerotized U-shaped cross-piece, plate rectangular with tufts of long microtrichia on posterior margin and tufts of short microtrichia on lateral parts ( Fig. 47 ). Sternite 8 not distinct. Tergite 9 with a pair of sclerotized straight apodemes converging posteriorly, plate more or less square-shaped, with tufts of long microtrichia on posterolateral parts ( Fig. 48 ). Sternite 9 more or less triangular, very finely apically bilobed, with a pair of sclerotized regions, with setae on apical part ( Fig. 49 ). Tegmen with an apical digitiform outgrowth; microsculpture consisting of pores on the digitiform outgrowth, interconected lines on apical part, and pores, long and short setae throughout the medial part ( Fig. 50 ). Penis slightly asymmetrical, rod-shaped, straight, basal part flattened (the apex partly missing in the specimen examined) ( Fig. 51 ).

Female genitalia. Female unknown.

Distribution. Brazil. Argentina: Chaco Province.

Remarks. Ora bivittata bears a brown stripe or vitta on each elytron as do O. obliqua Champion, 1897 (from Mexico and Guatemala) and O. discoidea Champion, 1897 (from Mexico, Guatemala and Honduras), and is similar to O. depressa in the rod-shaped penis, but its body size is much smaller than those of the three species mentioned above and the penis is straight rather than curved as in O. depressa .

Figures

FIGURES 1 – 12. Ora spp. from Argentina, habitus. 1 – 4, Ora atroapicalis Pic, 1928: 1, holotype, male; 2, male from PN Chaco; 3, female from Aguará Ñu (Paraguay); 4, detail of female elytral apex; 5, O. bivittata Pic, 1922, male from Chaco Province; 6, O. bruchi Pic, 1928, lectotype, female; 7 – 12, O. depressa (Fabricius, 1801): 7, male from PN Mburucuyá (Corrientes); 8, female from Corrientes; 9, female from PN Mburucuyá; 10, female from PN El Palmar (Entre Ríos); 11, female from Piquete (Santa fe); 12, female from Rosario (Santa Fe).

FIGURES 44 – 51. Ora bivittata Pic, male from Chaco. 44, abdomen, ventral aspect; 45, ventrite 5; 46, tergite 7; 47, tergite 8; 48, tergite 9; 49, sternite 9; 50, tegmen, dorsal aspect; 51, penis, dorsal aspect.