Xestoblatta surinamensis Bruijning, 1959

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 : 5

Xestoblatta surinamensis Bruijning, 1959

Figs. 24-34

Diagnosis. General coloration brownish ( Fig. 24 ). Head ferruginous yellow ( Fig. 25 ), stained yellowish-brown between antennal insertions; vertex and interocular space same color as head. Clypeus with two small marks on lateral margins, labrum dark brown. Ocelli pale brown, inconspicuous. Pronotum brownish-yellow with small dark-brown marks on lateral margin; central disk yellowish-brown, inconspicuous ( Fig. 26 ). Legs ferruginous yellow, coxae with two small pale brown marks. Spines ferruginous yellow, pulvilli white, arolia ferruginous yellow. Tegmen stained yellowish brown, except marginal field paler. Tergite and sternite following general coloration of body. Sternite with small lateral pale-brown marks.

Dimensions (in mm). Total length: 22.8; length of pronotum: 4.5; width of pronotum: 6.4; length of tegmen: 17.3; width of tegmen: 4.3.

Redescription. Head oval-triangular, interocular space narrow, 0.82 mm, slightly less than half distance between antennal bases. Ocelli small and inconspicuous. Vertex slightly exposed. Maxillary palp setose on all segments.

Thorax. Pronotum slightly convex, very slight angulation on posterior margin, maximum width in medio-basal region. Lateral flaps short, not deflexed. Legs robust with wide coxae; femur I with anteroventral surface bearing row of 12 long spines gradually decreasing in size apically, and ending in three long apical spines. Posteroventral surface with five equally spaced spines, the last spine apical. Pulvilli and arolia well developed, claws moderately developed. Tegmen well developed, exceeding apex of cerci. Marginal field slightly deflected, narrow. Discoidal field rounded. Scapular field ample. Anal field straight.

Abdomen. First to fourth tergites bearing angular lateral humps, sixth tergite with conspicuous lateromedially humps. Apical margin of fifth tergite twice emarginated laterally. Sixth tergite with large median depression. Seventh segment retracted ( Fig. 27 ) and rounded, bearing marginal cilia ( Fig. 28 ). Left style (ventral view) cylindrical, unsclerotized, concave at apex, slightly larger than right styles, conical, unsclerotized. Supra-anal plate triangular, projected between cerci, bilobed distally, with median notch ( Fig. 29 ). Right paraproct with slender bifid sclerotized structure, and third structure round, with three sclerotized apical spines ( Fig. 30 ). Left paraproct single, rhomboid, with rounded apex and three small sclerotized spines ( Fig. 31 ). Left phallomere hook-shaped (L3), apex slightly dilated and curved ( Fig. 32 ). Median sclerite (L2vm) sword-shaped ( Fig. 33 ). Right phallomere (R2) bearing inverted V-shaped structure with spiny projection ( Fig. 34 ).

Material examined. Paratype 1 male. BRAZIL, Pará: Castanhal municipality, 1964, Pirelli & M. Monné leg. ( MNRJ) .

Remarks. Xestoblatta surinamensis is similar to X. vera in the shape of the subgenital plate, insertion of styles, and paraprocts. They differ in the pattern of the projection of the right phallomere and in the sword-shaped configuration of the median sclerites.

Figures

Figures 24-34.Xestoblatta surinamensis, paratype male: (24) habitus, dorsal view, length 22.8 mm; (25) head, ventral view; (26) pronotum, dorsal view; (27) tergal modification of the tergite VII, dorsal view; (28) subgenital plate, ventral view; (29) supra anal plate, dorsal view; (30) left paraproct, dorsal view; (31) right paraproct, dorsal view; (32) left phallomere (L3), dorsal view; (33) median sclerite (L2vm), dorsal view; (34) right phallomere (R2), dorsal view. Scale bars: 25 = 7.0 mm, 26 = 2.0 mm, 27 = 3.0 mm, 28 = 1.2 mm, 29 = 1.7 mm, 30, 33 = 1.0 mm, 31 = 0.6 mm, 32 = 0.8 mm, 34 = 1.5 mm.