Dissomphalus thysanus, Azevedo, 2003

Azevedo, C. O., 2003, Synopsis of the Neotropical Dissomphalus (Hymenoptera, Bethylidae), Zootaxa 338 (1), pp. 1-74: 50-51

publication ID

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

publication LSID




persistent identifier


treatment provided by


scientific name

Dissomphalus thysanus

sp. nov.

Dissomphalus thysanus   sp. nov. ( Figs. 94–99 View FIGURES 88–99 )

Description. — Male. Body length 3.13 mm; LFW 2.13 mm. Color: head and mesosoma black; pronotal disc with transverse band castaneous, weak medially; metasoma dark castaneous; mandible, clypeus, legs and antenna castaneous, flagellomeres and base of clypeus darker; palpi light castaneous; wings subhyaline.

Head: mandible tridentate. Clypeus tridentate, median tooth small. First four antennal segments in a ratio of 15:6:5:7, segment XI 1.64 X as long as broad. Eye weakly hairy. Frons somewhat strongly coriaceous, punctures shallow, separated by 0.5–1.5 X their diameters. LH 1.02 X WH; WF 0.53 X WH; 1.07 X HE; OOL 1.4 X WOT; DAO 0.3 X WOT; posterior ocelli distant from the vertex crest 1.64 X DAO, frontal angle of ocellar triangle acute. Vertex badly convex, corners rounded. VOL 0.6 X HE.

Mesosoma: thorax less coriaceous than frons. Pronotal disc 0.6 X length of mesoscutum. Propodeal disc 0.81 X as long as wide. Fore femur 2.88 X as long as thick.

Metasoma: tergite II with pair of rounded and shallow depressions, distant each other 0.6 X their diameters and nearly reaching the posterior margin of tergite I, antero­lateral margin hairy, each depression with tubercle, with high rim and large hole, with tuft of long hairs, tufts slightly directed toward each other, space between the depression flattened, so that it seems only one large depression, which occupies the median 0,4 of the width of tergite II ( Figs. 94–95 View FIGURES 88–99 ). Hypopygium with stalk 1.3 X longer than plate, posterior margin straight. Genitalia ( Figs. 96–97 View FIGURES 88–99 ): paramere wide, 0.6 X as wide as long, apex wide, blunt and oblique, dorsal margin convex, ventral margin with thick setae; volsella with cuspis short and thick, basivolsella with thick apical tooth; aedeagus with ventral ramus much shorter than dorsal body, parallel, apex rounded and slightly more dilated than below, laminar, surface horizontal; dorsal body with three pairs of apical lobes, the dorsal pair with inner margin conspicuously fringed, apex sharpened and strongly curved downward ( Fig. 98 View FIGURES 88–99 ), median pair divergent, apex rounded ( Fig. 99 View FIGURES 88–99 ), with median size, the ventral pair slightly longer than ventral ramus, membranous and hairy; apodeme extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, DOMINICAN REPUBLIC, Pedernales, 24 km N Cabo Rojo , 610m, wet forest, 20.VIII–9.IX.1988, flight interception trap, Ivie, Philips & Johnson col. ( MTEC)   . PARATYPES: DOMINICAN REPUBLIC, Pedernales, same data as holotype, except 3 males, 20.VIII–25.IX.1988 ( MTEC)   ; 37 males, 13.5 km N Cabo Rojo , 140m, cactus thorn scrub, 21.VIII–10.IX.1986 ( MTEC)   ; 4 males, 26 km N Cabo Rojo, Sierra   Bahoruco, 145–540m, VII.1990, L. Masner col. ( PMAE)   ; 1 male, La Cumbre , 400m, 21.III.1978, L. Masner col. ( CNCI)   .

Variation. — Clypeus with base black, lateral teeth wider and rounded, median carina higher, depression of metasomal tergite II separated up to more than 1.0 X their diameters, so that the tubercle can be closer to lateral margin than median line, depression deeper or shallower, median area of metasomal tergite II broadly depressed, ventral ramus of aedeagus slightly directed downward, thinner, with apex not so rounded or badly convergent.

Etymology. — The specific epithet refers to the fringe of dorsal lobe of aedeagus.

Distribution. — Dominican Republic.


Montana State Entomology Collection


Canadian National Collection Insects