Dissomphalus lobicephalus, Azevedo, 2003

Azevedo, C. O., 2003, Synopsis of the Neotropical Dissomphalus (Hymenoptera, Bethylidae), Zootaxa 338 (1), pp. 1-74 : 14-15

Dissomphalus lobicephalus sp. nov. ( Figs. 1–6 )

Description. — Male. Body length 3.25 mm; LFW 2.5 mm. Color: head, mesosoma and clypeus black; metasoma, mandible and antenna dark castaneous; palpi and legs castaneous; wings subhyaline.

Head ( Fig. 1 ): mandible extremely long, apex nearly reaching the base of opposite mandible, slender, apical half slightly angled downward, ending as long tooth, with sharpened minute upper tooth ( Fig. 2 ). Clypeus broadly projected forward, lateral lobes more projected than the median one, which short and rounded, median carina conspicuous. First four antennal segments in a ratio of 17:6:5:5, segment XI 1.8 X as long as broad. Frons somewhat strongly coriaceous, punctures shallow, separated by 1–2 X their diameters. Head subquadrate, wider than thorax, 1.13 X as wide as long; WF 0.75 X WH; WF 2.1 X HE; OOL 1.63 X WOT; DAO 0.26 X WOT; posterior ocelli distant from the vertex crest 3.14 X DAO. Vertex concave, corners angulate, occipital carina visible in dorsal view, opened ventrally, ventral side of head strongly concave. VOL 1.19 X HE.

Mesosoma ( Fig. 1 ): thorax with same texture and punctures as on frons. Pronotal disc with strong anterior transverse carina, anterior corners angulate, 0.91 X length of mesoscutum. Propodeal disc 0.77 X as long as wide. Fore femur 3.33 X as long as thick.

Metasoma: tergite II with pair of very small lateral tubercles, with tuft of hairs above, widely separated each other ( Figs. 3–4 ). Hypopygium posterior margin straight. Genitalia ( Figs. 5–6 ): paramere with apex rounded and arched inward, apical half thin, base wide, dorsobasal corner angulate; volsella with digitus produced basally; aedeagus with ventral ramus shorter than dorsal body, basal half wide, sinuous below, outer margin convex, apical half abruptly thin, apex shortly blunt, inner margin angulate medially; dorsal body with two pairs of apical lobes, outer pair as high as ventral ramus, wider basally, laminar, outer surface convex, apex rounded in lateral view, inner pair much longer than outer pair, thin, membranous and stout, surface hairy; apodeme extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, BRAZIL, Paraná, Telêmaco Borba, Reserve Samuel Klabin , 24.XI.1986, Malaise trap, Profaupar col. ( DZUP) . PARATYPES: BRAZIL, Paraná, 1 male same data as holotype ; 1 male, São José dos Pinhais, Serra do Mar , Br 277 km 54 ; 2 males, Ponta Grossa, Vila Velha , Reserva Iapar , BR 376, 8.IV.1988, Malaise trap, Profaupar col. ( DZUP) .

Variation. — Body shorter, median carina of clypeus high, head not lobular in the vertex, pronotal disc narrower anteriorly, tuft of metasomal tergite II slightly larger.

Comments. — This striking new species has many peculiar characters of concerning the head, the vertex is lobular, the temple is strongly carinate, and the mandible is extremely long.

Etymology. — The specific epithet refers to the lobular vertex of the head.

Distribution. — Brazil (Paraná).

Figures

FIGURES 1–10. 1–6, Dissomphalus lobicephalus sp. nov. 1, head and mesosoma, dorsal view; 2, mandible, frontal view; 3, metasoma, latero­dorsal view; 4, tubercle, lateral view; 5, genitalia, ventral view; 6, genitalia, dorsal view; 7–10, Dissomphalus contractus sp. nov. 7, head and mesosoma, dorsal view; 8, mandible, frontal view; 9, genitalia, ventral view; 10, genitalia, dorsal view. (Scale bars = 0.5 mm, except for figure 4 = 0.1 mm).