Dissomphalus undatus, Azevedo, 2003

Azevedo, C. O., 2003, Synopsis of the Neotropical Dissomphalus (Hymenoptera, Bethylidae), Zootaxa 338 (1), pp. 1-74 : 46

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https://doi.org/ 10.11646/zootaxa.338.1.1

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Dissomphalus undatus

sp. nov.

Dissomphalus undatus sp. nov. ( Figs. 77–81 View FIGURES 72–87 )

Description. — Male. Body length 4.5 mm; LFW 3.15 mm. Color: head and mesosoma black; metasoma, clypeus and antennae dark castaneous, scape lighter; mandible and legs castaneous; palpi light castaneous; wings subhyaline.

Head: mandible bidentate. Clypeus trapezoidal. First four antennal segments in a ratio of 15:5:5:6, segment XI 1.69 X as long as broad, sensillae conspicuous. Frons strongly coriaceous, punctures inconspicuous, shallow, separated by 0.3–1.5 X their diameters. LH 0.99 X WH; WF 0.62 X WH; 1.38 X HE; OOL 1.26 X WOT; DAO 0.37 X WOT; posterior ocelli distant from the vertex crest 1.3 X DAO, frontal angle of ocellar triangle acute. Vertex straight, corners rounded. VOL 0.49 X HE.

Mesosoma: thorax coriaceous as frons. Pronotal disc 0.55 X length of mesoscutum. Propodeal disc 0.65 X as long as wide. Fore femur 3.3 X as long as thick.

Metasoma: tergite II with pair of elliptical pits, distant each other 4.3 X their length, distant from posterior margin of tergite I 0.55 X their length, closer to the lateral margin than the middle, placed at the inner area of rounded depression, inner part of each pit covered by translucid sclerite, so that the hole is hemispheric and inclined, from which emerges small tuft of hairs. Hypopygium with median stalk 1.3 X as long as plate, posterior margin slightly concave. Genitalia ( Figs. 77–78 View FIGURES 72–87 ): paramere wide, with apex as a triangular expansion, dorsal margin convex, ventral margin straight; digitus with long end; aedeagus with ventral ramus much shorter than dorsal body, laminar, surface vertical, convex outside, apex sharpened and directed inward; dorsal body with two pairs of apical lobes, outer pair laminar, surface vertical and waved, ventral margin strongly fringed, weaker apically ( Figs. 79–80 View FIGURES 72–87 ), inner pair membranous, stout and hairy ( Fig. 81 View FIGURES 72–87 ); apodeme extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, BRAZIL, Rio de Janeiro, Silva Jardim , VIII.1974, F. M. Oliveira col. ( CNCI) . PARATYPES: BRAZIL, 3 males, same data as holotype ( CNCI) .

Etymology. — The specific epithet refers to the waved ventral margin of outer lobe of aedeagus.

Distribution. — Brazil (Rio de Janeiro).


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