Dissomphalus perparvus 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 : 15-17

Dissomphalus perparvus Alencar & Azevedo , sp. nov.

( Figs. 53–59 )

Dissomphalus microstictus Evans, 1969 in partim.

Diagnosis: male. This species is easily diagnosed by the unique combination of characters: the paramere wide subapically in dorsal view; the filament of ventral ramus inserted subapically, nearly as long as ramus and sinuous; the dorsal body with dorsal margin of outer lobe waved in dorsal view; the basal bar trapezoidal, upper margin with median angled elevation; the connector with lateral expansion concave, mid part straight and narrow; and the basal plate with median projection in upper margin and lower margin concave.

Description: male, body length 4.15 mm; LFW 2.8 mm. Color: head and mesosoma black, except pronotum light castaneous with narrow posterior line yellowish; clypeus and metasoma dark castaneous; mandible, palpi and legs yellowish except coxa and femur darker; antenna light castaneous and gradually darker distally; wings subhyaline.

Head: mandible tridentate, uppermost tooth inconspicuous ( Fig. 53 ). Clypeus with subtrapezoidal median lobe, median carina complete. Relative length of first four antennal segments ~12:4:4:5 segment XI 1.3x as long as wide. Frons coriaceous, punctures small and shallow, separated by 0.5–1.0x their diameter. LH 1.0x WH; WF 0.6x WH; WF 1.2x HE; OOL 0.6x WOT; DAO 0.3x WOT; posterior ocellus distant from crest of vertex 1.5x DAO. Vertex somewhat concave; VOL 0.6x HE.

Mesosoma: thoracic dorsum weakly coriaceous, punctures smaller and sparser than those of frons. Pronotal disc 0.7 x 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 absent. Fore femur 2.8x as long as wide.

Metasoma ( Fig. 54 ): tergite II with pair of elliptical, small and shallow lateral depressions, separated by 2.7x their diameter, each depression with small pit with raised rims and with one short seta directed upward, antero-lateral margin with long setae. Hypopygium with posterior margin straight.

Genitalia ( Figs. 55–59 ): paramere wide subapically in dorsal view; apex rounded and arched mesad; ventral margin strongly concave apically, apical corner small and angled, somewhat concave basally; dorsal margin convex with subapical acute concavity ( Figs. 55, 56, 59 ). Dorsal margin of basiparamere somewhat concave. Cuspis long and arched, apex rounded, digitus with apex pointed and smooth in upper margin. Basivolsella with few long setae below volsellar process. 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 subapically, nearly as long as ramus, sinuous, narrow and arched dorsad ( Fig. 55 ); dorsal body with two pairs of apical lobes, outer pair laminar, surface vertical, wide, apex convergent, dorsal margin irregular in lateral view ( Fig. 58 ) and waved in dorsal view ( Fig. 56 ), ventral margin with subapical strong concavity and projection straight and serrate ( Figs. 57, 58 ), inner pair long, membranous, hairy, and granulate; basal bar trapezoidal, upper margin with median angled elevation, lower margin almost touching basal plate; connector with lateral expansion concave, mid part straight and narrow; basal plate with upper margin with median projection to apex, lower margin convex ( Fig. 56 ). Apodeme of aedeagus extending beyond elliptical genital ring.

Material examined: HOLOTYPE: male, Sergipe, Santa Luzia do Itanhy, Crasto , 11º22’37.4”S 37º24’50.3”W, 29.vii–04.viii.2001, armadilha Malaise, M. T. Tavares e eq. col. ( MZSP) (previously identified as D. microstictus in Redighieri & Azevedo 2006) . PARATYPES: Material identified by Redighieri & Azevedo (2006) as D. microstictus : BRAZIL : 8 males, same data as holotype. ( MZSP) ; 3 males, Bahia, Ilhéus, Mata da Esperança , 14º46’S 39º04’W, 15–18.v.2002, armadilha Malaise, A. M. Penteado-Dias e eq. col. ( MZSP) .

Variation: body length from 2.50 to 5.10 mm; tergal process with depression large or small, pit large or small and hypopygium somewhat concave.

Comments: this species is similar to D. osseus by having the basal bar trapezoidal. However D. perparvus has the connector with lateral expansion concave, mid part straight and narrow whereas in D. osseus the base of the connector is bifurcate.

D. perparvus is also similar to D. paululus by having the basal plate with median projection in the upper margin. However D. perparvus has the filament of ventral ramus longer than in D. paululus .

Etymology: the specific Latin epithet refers to the very small genitalia, which is the smallest among the species of the microstictus species-group.

Distribution: Brazil (NE).

Figures

FIGURES 53–65. 53–59, Dissomphalus perparvus. 53, mandible, frontal view; 54, tergal process, dorsal view; 55, genitalia, ventral view; 56, genitalia, dorsal view; 57, outer lobe, ventral view; 58, apex of outer lobe, lateral view; 59, paramere, lateral view; 60–65, Dissomphalus perturbatus. 60, tergal process, dorsal view; 61, genitalia, ventral view; 62, genitalia, dorsal view; 63, outer lobe, ventral view; 64, apex of dorsal body, lateral view; 65, paramere, lateral view. (Scale bars = 250 µm).