Pseudisobrachium triacutum, Waichert, C. & Azevedo, C. O., 2004

Waichert, C. & Azevedo, C. O., 2004, Fourteen new species of Pseudisobrachium (Hymenoptera, Bethylidae) from Atlantic rain forest of Espírito Santo, Brazil, Zootaxa 661, pp. 1-22 : 5-6

Pseudisobrachium triacutum sp. nov. ( Figs. 6–11 )

Description.— Male. Body length 2.46 mm; LFW 1.68 mm. Color: head and thorax black, metasoma dark castaneous; mandible light castaneous; antenna dark castaneous, the three first segments light castaneous; legs light castaneous; wings subhyaline, veins dark castaneous. Pubescence conspicuous.

Head ( Fig. 6 ): mandible with 5 sharp teeth ( Fig. 7 ). Clypeus with trapezoidal median lobe, strongly projected, apical margin emarginate and angled, median carina bifurcate apically. First four antennal segments in a ratio of 26:8:18:12, segment III 2.33 X longer than thick, segment XI 2.25 X; pubescence of flagellum subappressed, with some erect setae. Frons coriaceous, with regular punctures, shallow and sparse. WH 0.8 X LH, WF 0.56 X WH, WF 1.07 X HE; DAO 0.28 X WF; ocellar triangle compact, with acute frons angle; OOL 0.87 X WOT. Vertex slightly convex, corners rounded. VOL 1.0 X HE. Temples subparallel.

Mesosoma: pronotum and mesoscutum coriaceous, punctures similar to those of frons, but smaller; notauli narrow and short, occupying only the superior third of mesoscutum, parapsidal furrow narrow and complete; scutellar disc with same texture as mesoscutum. Propodeal disc 1.07 X as long as wide, 1.68 X as long as high, areolate anteriorly and transversally striate posteriorly, median carina incomplete, lateral and posterior carinae present, declivity strigulate, lateral coriaceous. Mesopleuron coriaceous with elongate coriaceous callus. Fore wings with discoidal vein spectral, not interstitial with median vein.

Genitalia ( Figs. 8–11 ): paramere evenly wide; ventral arm 2.8 X wider than dorsal arm, vannus with 5 inclined grooves; aedeagus narrow, only slightly wider medially, apex emarginate medially, truncate in lateral view.

Material examined.— HOLOTYPE: male, BRAZIL, Espírito Santo, Santa Teresa, Estação Biológica de Santa Lúcia, 23.VII.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES). PARATYPES: BRAZIL, Espírito Santo, 131 males, Santa Teresa, Estação Biológica de Santa Lúcia, 30.I–10.XII.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES); 5 males, Cariacica, Reserva Biológica de Reserva Biológica de Duas Bocas, 24.IX.1996 – 25.II.1997, sweeping, C.O. Azevedo & H. S. Sá col. ( UFES).

Variations.— Specimens from Reserva Biológica de Duas Bocas with pronotum somewhat light castaneous. Some specimens with body more robust; head larger or narrower; notauli almost absent. Propodeal disc completely areolate, but cells smaller than the specimens from Estação Biológica de Santa Lúcia.

Discussion.— This species has the genitalia slender and more elongate than is typical of the genus.

Etymology.— The specific epithet refers the apical margin of the median lobe of clypeus.

Distribution.— Brazil (Espírito Santo).

Figures

FIGURES 1 – 11. 1 – 5, Pseudisobrachium ventriosum sp. nov. 1, head, dorsal view; 2, mandible, frontal view; 3, genitalia, ventral view; 4, aedeagus, lateral view; 5, paramere, lateral view; 6 – 11, Pseudisobrachium triacutum sp. nov. 6, head, dorsal view; 7, mandible, frontal view; 8, genitalia, ventral view; 9, aedeagus, lateral view; 10, ventral arm of paramere, lateral view; 11, dorsal arm of paramere, lateral view. (Scale bars = 250 μm for head and mandible, = 130 μm for genitalia).