Dissomphalus divaricatus Alencar & Azevedo, 2008

Alencar, I. D. C. C. & Azevedo, C. O., 2008, A new species-group of Dissomphalus (Hymenoptera: Bethylidae), with description of thirteen new species, Zootaxa 1851 (1), pp. 1-28 : 9-10

Dissomphalus divaricatus Alencar & Azevedo , sp. nov.

( Figs. 22–27 )

Diagnosis: male. This species is easily separated from the remainder by this unique combination of characters: the paramere wide basally in dorsal view; the filament of ventral ramus inserted subapically, nearly as long as ramus and convergent; the dorsal body with apex divergent, the basal bar triangular, the connector irregular and sinuous; and the basal plate simple.

Description: male, body length 3.80 mm; LFW 2.70 mm. Color: head and mesosoma black, except pronotum somewhat castaneous with narrow posterior line light castaneous; clypeus, mandible and metasoma castaneous; palpi and legs yellowish; antenna light castaneous and gradually darker distally; wings subhyaline.

Head: mandible bidentate. Clypeus with subtrapezoidal median lobe, median carina complete. Relative length of first four antennal segments ~8:4:4:5, segment XI 1.6x as long as wide. Frons weakly coriaceous, punctures small and very shallow, separated by 1.0–1.5x their diameter. LH 1.0x WH; WF 0.5x WH; WF 1.2x HE; OOL 0.8x WOT; DAO 0.3x WOT; posterior ocellus distant from crest of vertex 1.3x DAO. Vertex somewhat concave; VOL 0.8x HE.

Mesosoma: thoracic dorsum weakly coriaceous, punctures much smaller and sparser than those of frons. Pronotal disc 0.5x length of mesoscutum. Notaulus complete. Propodeal disc 0.9x as long as wide, irregularly rugose, median carina incomplete, posterior part flat, polished and shinny; lateral surface of propodeum weakly coriaceous; declivity imbricate, median carina incomplete posteriorly. Fore femur 2.7x as long as wide.

Metasoma ( Fig. 22 ): tergite II with pair of circular, large and very shallow lateral depressions, separated by 1.4x their diameter, each depression with pit with raised rims, and few seta mesad, lateral margin with short setae. Hypopygium with posterior margin concave.

Genitalia ( Figs. 23–27 ): paramere wide basally in dorsal view; apex rounded and arched mesad; ventral margin strongly concave apically, apical corner very small and angled, concave basally; dorsal margin convex with subapical acute concavity ( Figs. 23, 24, 27 ). Dorsal margin of basiparamere somewhat straight. Cuspis long and arched, apex rounded, digitus with apex pointed and smooth in upper margin. Aedeagus with ventral ramus shorter than dorsal body, laminar, surface horizontal, inner margin straight in ventral view, ventrad except base flat with narrow fold, outer margin convex, basally with ventral fold, filament inserted subapi- cally, nearly as long as ramus, convergent, narrow, thin and arched dorsad ( Fig. 23 ); dorsal body with two pairs of apical lobes, outer pair laminar, surface vertical, wide, apex divergent, dorsal margin convex in lateral view ( Fig. 26 ) and sinuous in dorsal view ( Fig. 24 ), ventral margin with subapical strong concavity and projection concave and serrate ( Fig. 23, 25 ), inner pair irregular in lateral view, membranous, and hairy; basal bar triangular, without upper margin defined, lower margin touching basal plate; connector sinuous; basal plate simple ( Fig. 24 ). Apodeme of aedeagus not extending beyond elliptical genital ring.

Material examined: HOLOTYPE: male, PERU, [Loreto], Iquitos, Rio Ne {a}po, Rio Sucuj {s}ari, ACEER { Amazon Center for Environmental Education and Research } Foundation Camp , low land, rain for[est], [~ 3º15’S 72º54’W], 27–29.XII.1997, MT, M.V.L. Barday col. ( CNCI).

Comments: the genitalia of this species are similar to those of D. microstictus . However D. divaricatus has the apex of the dorsal body divergent and the connector irregular and sinuous whereas D. microstictus has the apex straight and the lateral expansion of the connector bifurcate.

Etymology: the specific Latin epithet refers to the apex divergent of the dorsal body.

Distribution: Peru.

Figures

FIGURES 17–27. 17–21, Dissomphalus balteus. 17, genitalia, ventral view; 18, genitalia, dorsal view; 19, outer lobe, ventral view; 20, apex of dorsal body, lateral view; 21, paramere, lateral view; 22–27, Dissomphalus divaricatus. 22, tergal process, dorsal view; 23, genitalia, ventral view; 24, genitalia, dorsal view; 25, filament of ventral ramus, lateral view; 26, apex of dorsal body, lateral view; 27, paramere, lateral view. (Scale bars = 250 µm).