Xestoblatta buhrnheimi, Silva-da-Silva, Luiz Rafael & Lopes, Sonia Maria, 2015

Silva-da-Silva, Luiz Rafael & Lopes, Sonia Maria, 2015, Two new species of Xestoblatta Hebard, 1916 from Brazil, a redescription of Xestoblattaroppai Rocha e Silva Albuquerque & Fraga, 1975 and a key for the species of the buscki group (Blattodea, Ectobiidae, Blattellinae), ZooKeys 526, pp. 117-129 : 119

Taxon classification Animalia Blattodea Ectobiidae

Xestoblatta buhrnheimi sp. n. Figs 1-11

Type material.

Holotype ♂. BRAZIL, Amazonas, Coari, Rio Urucu, ROC 27' - 4°49'34"S / 065°15'37"W, 05-18/03/1994. P.F. Bührnheim et. cols. (Shannon trap), in MNRJ.

Diagnosis.

This species is characterized by having supra-anal plate with lower margin with two small medio-lateral protuberances; left paraproct slender, weakly sclerotized, folded on itself; right paraproct hooked, strongly sclerotized, round apically, reaching beyond half of plate and covered with spines ventrally; genitalia with left phallomere hooked, concave, sclerotized, slender apically;. median sclerite long, slender, with lanceolate tip (Fig. 10). Right phallomere triangular medially, weakly sclerotized and bearing convex sclerotized structure apically.

Description.

Holotype. Male dimensions (mm): total length: 28. length of pronotum: 5.3; width of pronotum 7.4; length of tegmen: 24.1; width of tegmen 6.1. General coloration brown (Fig. 1). Pronotum light brown, shiny, with small irregular marks (Fig. 2). Head with vertex yellowish; palp light brown; antenna with apical segments dark brown (Fig. 3). Legs yellowish brown with dark brown spines. Pulvilli milky yellow. Arolia brown. Tegmen with anal field dark brown, lateral flap yellowish brown. Abdomen dark brown with white marks on medial area of first tergites. Supra-anal plate and subgenital plate yellowish brown.

Head. Triangular; interocular space narrow, occupying more than half the space between antennal insertions; vertex completely exposed. Ocelli small and little differentiated. Antennae long, slender, reaching beyond tip of abdomen; last segment of maxillary palp setose, 5th segment subequal to 4th segment.

Thorax. Pronotum convex and subtrapezoidal, apex straight, base slightly angular with lateral flaps slightly deflexed and margins round, widest at mid-caudal region. Disk of pronotum without sulci. Fore femur on anteroventral surface with 12 spines decreasing in size and two apical spines; mid femur on anteroventral surface with five spines decreasing in size and three spines increasing in distally; geniculate spine present; posteroventral surface with four subequal spines. Hind femur on anteroventral surface with seven subequal spines, plus one apical spine and one geniculated spine. Mid and hind coxae with latero-apical projections on inner surface. Arolia present. Claws symmetrical and without specialization. Tegmen developed, reaching beyond apex of abdomen, wider in anterior 1/3; marginal field well marked and slightly concave; scapular field slightly widened and round; discoidal field ample, anal field wide, with 8 axillary veins. Wings developed; ulnar vein with five incomplete rami and seven complete rami; apical triangle not developed; anal field folded as a fan.

Abdomen. Tergite I bearing median concavity with a series of marginal setae (Fig. 4). Tergite VII with two sulci on lateral margins, which are hidden by expansion of tergite VI (Fig. 5). Subgenital plate widened, with lower border setose, apex “V” shaped; left style small, wide, sclerotized with 2-3 apical spines; right accessory style similar to right style, and inserted next to it; left style small, wide, sclerotized, with 2-3 apical spines; left accessory style slender, shorter than other styles (Fig. 6). Supra-anal plate with lower margin with two small medio-lateral protuberances (Fig. 7). Left paraproct slender, weakly sclerotized, folded on itself; right paraproct hooked, strongly sclerotized, round apically, reaching beyond half of plate and covered with spines ventrally (Fig. 8). Genitalia with left phallomere hooked, concave, sclerotized, slender apically (Fig. 9). Median sclerite long, slender, with lanceolate tip (Fig. 10). Right phallomere triangular medially, weakly sclerotized and bearing convex sclerotized structure apically (Fig. 11).

Remarks.

This species is close to Xestoblatta roppai in size, in the paraproct covered with spines ventrally, and modifications of tergite VII. It differs in the shape of the subgenital plate and the paraproct is longer and more slender than in Xestoblatta roppai (Figs 39 and 41).

Etymology.

The species was named in honor of Frederico Bührnheim, collectors of the specimens.

Known geographical distribution.

Brazil (AM)