Xestoblatta urucuana, Silva-da-Silva & Lopes, 2016

Silva-da-Silva, Luiz Rafael & Lopes, Sonia Maria, 2016, A new species of the Xestoblatta surinamensis group from Amazonia, northern Brazil, with redescriptions of X. amaparica, X. surinamensis and X. vera (Blattodea: Ectobiidae), Zoologia (e 20160041) 33 (6), pp. 1-9 : 2

Xestoblatta urucuana sp. nov.

Figs. 1-12

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Diagnosis. General coloration brown ( Fig. 1 ). Head. Vertex yellowish; palp light brown ( Fig. 2 ). Pronotum glossy brown on lateral margins ( Fig. 3 ). Legs yellowish with dark-brown spines. Coxa with small dark-brown marks along its length. Pulvilli and arolia white. Tegmen with anal field dark brown, lateral flap brownish-yellow. Abdomen brown. Supra-anal and subgenital plates brownish-yellow.

Dimensions (in mm). Total length: 18.4; length of pronotum: 4.6; width of pronotum 4.2; length of tegmen: 15.7; width of tegmen: 7.2.

Description of the male Holotype. Head triangular; interocular space narrow, 0.78 mm, less than half distance between antennal bases; vertex completely exposed. Ocelli small, inconspicuous. Antennae long, slender, exceeding apex of abdomen.

Thorax. Pronotum convex and subtrapezoidal. Disc of pronotum lacking grooves. Fore femur, anteroventral surface with a row of 13 spines gradually decreasing in size apically, and two apical spines; middle femur, anteroventral surface with a row of seven spines gradually decreasing in size apically. Geniculate spine present; posteroventral surface with four spines subequal in size. Hind femur with row of six subequal spines on anteroventral surface, plus apical spine and geniculate spine. Middle and hind coxae bearing lateroapical projections on inner surface. Arolia present.Claws symmetrical and unspecialized.Tegmen developed, exceeding apex of abdomen, wider in anterior third; marginal field well demarcated and slightly concave; scapular field slightly enlarged and round; discoidal field ample, anal field wide, with eight auxiliary veins. Wings developed; ulnar vein with five complete rami; apical triangle not developed; anal field folded in fan.

Abdomen. Median tergal modification on tergite VII shaped as shallow sulcus ( Fig. 4 ). Subgenital plate widened, with lower margin setose, apex curved, slightly projected. Right stylus (ventral view) inserted near median surface, digitiform, weakly sclerotized, small, measuring about 1/5 of left stylus, bearing spiny projection near margin of the plate ( Fig. 6 ); left stylus (ventral view) central, elongated, sclerotized, curved at apex, near margin of subgenital plate ( Fig. 5 ). Supra-anal plate with median sulcus on lower margin ( Fig. 7 ). Left paraproct ( Fig. 8 ) slender, sclerotized, with three slender structures, one of these with two apical spines. Right paraproct digitiform, sclerotized, rounded apically, with three apical spines ( Fig. 9 ). Genitalia with left phallomere (L3) hook-shaped, concave, sclerotized, slender distally ( Fig. 10 ). Median sclerite long (L2vm), slender, apex lanceolate ( Fig. 11 ). Right phallomere (R2) triangular medially, sclerotized, and bearing distally curved sclerotized structure ( Fig. 12 ).

Material examined. Holotype male. BRAZIL, Amazonas: Coari municipality ( Rio Urucu , ROC 27’, 04°49’33”S / 065°01’49”W, 05,17, 29/09/1995), P.F. Bührnheimer & N.O. Aguiar leg. (Shannon trap) . Paratypes 9 males and 3 females with same data as holotype. All specimens deposited in MNRJ .

Etymology. The specific name refers to the type locality along the Urucu River, state of Amazonas, northern Brazil.

Remarks. Xestoblatta urucuana sp. nov. is similar to X. surinamensis in size, shape of paraprocts, tergal modifications on tergite VII, and median sclerite with lanceolate tip; but differs sharply from X.surinamensis by the configuration of the subgenital plate widened, with the lower margin setose, apex curved and slightly projected. Right stylus (ventral view) inserted near median surface, digitiform, weakly sclerotized, small, measuring about 1/5 of left stylus, bearing spiny projection near margin of plate ( Fig. 5 ).

Figures

Figures 1-12. Xestoblatta urucuana sp. nov., holotype male: (1) habitus, dorsal view, length 18.4 mm; (2) head, ventral view; (3) pronotum, dorsal view; (4) tergal modification of the tergite VII, dorsal view; (5) subgenital plate, ventral view; (6) left style, ventral view; (7) supra anal plate, dorsal view; (8) left paraproct, dorsal view; (9) right paraproct, dorsal view; (10) left phallomere (L3), dorsal view; (11) median esclerite (L2vm), dorsal view; (12) right phallomere (R2), dorsal view. Scale bars: 2 = 2.5 mm, 3-4 = 3.0 mm, 5, 11-12 = 1.5 mm, 6 = 0.15 mm, 7 = 1.8 mm, 8-9 = 0.8 mm, 10 = 0.7 mm.