Dissomphalus osseus 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 : 12-14

Dissomphalus osseus Alencar & Azevedo , sp. nov.

( Figs. 41–46 )

Dissomphalus microstictus Evans, 1969 in partim.

Diagnosis: male. This species can be diagnosed by the following unique combination of characters: the

paramere wide subapically in dorsal view; the filament of ventral ramus inserted subapically, nearly as long as ramus and straight; the dorsal body with basal bar trapezoidal; the connector with a bifurcate base; and the basal plate with median projection to apex in upper margin and lower margin concave.

Description: male, body length 4.00 mm; LFW 3.15 mm. Color: head and mesosoma black, except pronotum castaneous with narrow posterior line light castaneous; clypeus and propodeum dark castaneous; metasoma castaneous; mandible, palpi and legs yellowish; antenna light castaneous and gradually darker distally; wings subhyaline.

Head: mandible tridentate, uppermost tooth inconspicuous. Clypeus with trapezoidal median lobe, median carina complete. Relative length of first four antennal segments ~15:5:5:6, segment XI 2.0x as long as wide. Frons coriaceous, punctures small and shallow, separated by 0.5–2.0x their diameter. LH 1.0x WH; WF 0.6x WH; WF 1.2x HE; OOL 0.5x WOT; DAO 0.3x WOT; posterior ocellus distant from crest of vertex 1.5x DAO. Vertex somewhat convex; VOL 0.6x HE.

Mesosoma: thoracic dorsum weakly coriaceous, punctures smaller and sparser than those of frons. Pronotal disc 0.6x length of mesoscutum. Notaulus complete. Propodeal disc 0.8x as long as wide, irregularly rugose, median carina incomplete, posterior part elevate, polished and shinny; lateral surface of propodeum weakly coriaceous; declivity imbricate, median carina complete. Fore femur 3.8x as long as wide.

Metasoma ( Fig. 41 ): tergite II with pair of circular, large and shallow lateral depressions, separated by 2.0x their diameter, each depression with minute tubercle, which has small pit on top with one short seta directed backward, lateral margin with long setae. Hypopygium with posterior margin concave.

Genitalia ( Figs. 42–46 ): paramere wide subapically in dorsal view; apex rounded and arched mesad; ventral margin strongly concave apically, apical corner large and angled, concave basally; dorsal margin convex with subapical acute concavity ( Figs. 42, 43, 46 ). Dorsal margin of basiparamere sinuous. 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, filament inserted subapically, nearly as long as ramus, straight, narrow ( Fig. 42 ); dorsal body with two pairs of apical lobes, outer pair laminar longer than paramere, surface vertical, wide, apex convergent, dorsal margin convex in lateral view ( Fig. 45 ) and sinuous in dorsal view ( Fig. 43 ), ventral margin with subapical strong concavity and projection somewhat concave and serrate ( Figs. 44, 45 ), inner pair large and long, membranous, hairy, and granulate; basal bar trapezoidal, upper margin with median rounded elevation, lower margin almost touching basal plate; connector with bifurcate base; basal plate with upper margin with median projection to apex, lower margin convex ( Fig. 43 ). Apodeme of aedeagus extending beyond elliptical genital ring.

Material examined: HOLOTYPE: male, Alagoas, Quebrângulo, Reserva Biológica da Pedra Talhada , 09º14’54”S 36º25’32”W, 11–14.ix.2002, armadilha Malaise, A. M. Penteado– Dias e eq. col. ( MZSP) (previously identified as D. microstictus in Redighieri & Azevedo 2006) . PARATYPES: Material identified by Azevedo (1999b) as D. microstictus : BRAZIL: Pernambuco, Caruaru , [~ 8º17’S 35º58’W]: 1 male, iv.1972, M. Alvarenga col. ( UFES) ; 1 male, vii.1972, J. Lima col. ( UFES) ; 1 male, same data as holotype ( MZSP) . Material identified by Redighieri & Azevedo (2006) as D. microstictus : 1 male, same data as holotype ( MZSP) .

Variation: body length from 3.6 to 4.55 mm; body lighter than holotype; head with vertex somewhat concave; declivity of propodeum without median carina; tergal process without depression.

Comments: this species is unique by having the connector with base bifurcate. All specimens of this species have the filament straight and directed backward. The direction seems to change by muscular action as it is observed in genitalia in copulation.

Etymology: the specific Latin epithet refers to the shape of the connector, which resembles a wishbone.

Distribution: Brazil (NE).

Figures

FIGURES 41–52. 41–46, Dissomphalus osseus. 41, tergal process, dorsal view; 42, genitalia, ventral view; 43, genitalia, dorsal view; 44, outer lobe, ventral view; 45, apex of dorsal body, lateral view; 46, paramere, lateral view; 47–52, Dissomphalus paululus. 47, tergal process, dorsal view; 48, genitalia, ventral view; 49, genitalia, dorsal view; 50, outer lobe, ventral view; 51, apex of dorsal body, lateral view; 52, paramere, lateral view. (Scale bars = 250 µm).