Dissomphalus laticephalus, Azevedo, 2003

Azevedo, C. O., 2003, Synopsis of the Neotropical Dissomphalus (Hymenoptera, Bethylidae), Zootaxa 338 (1), pp. 1-74: 17-19

publication ID

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

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scientific name

Dissomphalus laticephalus

sp. nov.

Dissomphalus laticephalus   sp. nov. ( Figs. 11–15 View FIGURES 11–25 )

Description. — Male. Body length 2.5 mm; LFW 2.1 mm. Color: body dark castaneous, metasoma lighter; mandible, antenna and legs castaneous; wings subhyaline.

Head ( Fig. 11 View FIGURES 11–25 ): mandible very long, overlapping more than the apical half of opposite mandible, slender, wider apically, tetradentate, the two upper teeth small and rounded, the two lower teeth sharpened, the lowest one wider and larger ( Fig. 12 View FIGURES 11–25 ). Clypeus with median lobe angulate, lateral lobes slightly shorter than median one, median carina high and angulate in profile. First four antennal segments in a ratio of 23:8:6:6, segment XI 1.4 X as long as broad. Eye with sparse and short hairs. Frons coriaceous, punctures shallow, inconspicuous. Head wider than thorax, with sides diverging below, 1.23 X as wide as long; WF 0.75 X WH; WF 2.33 X HE; OOL 1.99 X WOT; DAO 0.36 X WOT; posterior ocelli distant from the vertex crest 2.59 X DAO. Vertex straight, corners rounded, occipital carina lacking medially in ventral side, genae short, postgenae larger than genae. VOL 0.82 X HE.

Mesosoma ( Fig. 11 View FIGURES 11–25 ): thorax with mesoscutum less coriaceous than frons. Pronotal disc 0.39 X length of mesoscutum. Notauli incomplete posteriorly. Mesoaxillar pit deep. Metanotum with median fovea small, paramedian fovea deep and large. Propodeal disc 0.78 X as long as wide, almost wholly striate, median carina complete, posterior carina weak; declivity without median carina. Fore femur 4.18 X as long as thick.

Metasoma: tergite II with pair of lateral tuft of short hairs, lighter than the surface, close to the lateral rim ( Fig. 13 View FIGURES 11–25 ). Hypopygium with posterior margin straight. Genitalia ( Fig. 14–15 View FIGURES 11–25 ): paramere with apex thin, rounded and arched inward, base wide, dorsal margin produced and angled in and downward, very concave on the apical half, ventral margin evenly concave; volsella with cuspis long, apex slightly widened; aedeagus with ventral ramus as long as dorsal body, laminar, horizontal, wide, narrowing gradually up to the rounded apex, apical third slightly twisted, so that the apical surface is vertical; dorsal body with two pairs of apical lobes, outer pair laminar, surface convex outside, base produced in and upward, apex rounded in lateral view, inner pair slightly longer than outer pair, stout, membranous, apex rounded, surface hairy; apodeme extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, BRAZIL, São Paulo, São José do Barreiro , 1650m, I.1986, Alvarenga col. ( CNCI).  

Comments. — This species is known only from the type. It has peculiar character as mandible very long.

Etymology. — The specific epithet refers to the width of head.

Distribution. — Brazil (São Paulo).


Canadian National Collection Insects