Szelenyiopria talitae Loiácono et Margaría, Loiacono et Margaria, 2013

Loiácono, Marta, Margaría, Cecilia, Moreira, Denise D. O. & Aquino, Daniel, 2013, A new species of Szelenyiopria Fabritius (Hymenoptera: Diapriidae), larval parasitoid of Acromyrmex subterraneus subterraneus (Forel) (Hymenoptera: Formicidae) from Brazil, Zootaxa 3646 (3), pp. 228-234: 229-231

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Szelenyiopria talitae Loiácono et Margaría

sp. nov.

Szelenyiopria talitae Loiácono et Margaría   sp. nov.

( Figs 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Female ( Figs 1 View FIGURE 1 A, B). Holotype. Length 3.4 mm, color dark chestnut brown, except antenna, tegula and legs slightly light; body smooth and shinny.

Head. In dorsal view ( Fig. 1 View FIGURE 1 A) subglobular, wider than long (1.30), frons unarmed, antennal shelf not margined posteriorly; temples behind eyes relatively long, gradually rounded, POL:LOL:OOL= 3.5: 1.5: 4; head in lateral view with torulus in upper half of eye ( Figs 1 View FIGURE 1 B, 2 A); eyes small, ovoid, higher than half head height (1.60), posterior margin rounded; ommatidia relatively small, not convex, ocellus distinctly larger than ommatidium (2.15); postgenal cushion well developed, occipital flange rudimentary; head in frontal view with mandible bidentate, lower tooth slightly longer than upper tooth; palpal formula 5 - 2; antenna ( Fig. 2 View FIGURE 2 C) 11 -segmented; clava strong with 4 -clavomeres subrectangular and flattened ventrally, apical segment subconical, longer than preceding clavomere; A 1 long and cylindrical, unarmed apically; antennomeres in proportions: (13: 2.7), (2.6: 1), (2: 1.4), (1.85: 0.7), (1.38: 1), (0.75: 0.3), (0.32: 0.26), (0.5: 0.42), (0.5:07), (0.4: 1), (1.4: 0.8).

Mesosoma   . In dorsal view slightly longer than wide (1.15) ( Fig. 1 View FIGURE 1 A), with massive hairy cushion anterodorsally; mesoscutum as long as wide; anterior scutellar pit large, rather deep, slightly transverse; scutellar disc moderately convex, axilla slightly smaller than scutellar pit; dorsellum well developed, with three keels; propodeum strongly developed, median keel only moderately produced anteriorly; posterolateral corners of propodeum strongly developed; posterior margin deeply excavated medially; mesopleuron in lateral view moderately convex, metapleuron densely hairy ( Fig. 1 View FIGURE 1 B). Wings slightly glassy ( Fig. 2 View FIGURE 2 B); fore wings 3.6 times longer than wide, submarginal vein reaching proximal third of wing length, stigmal vein moderately developed; hind wings narrow, 10.5 times longer than wide. Legs slender, with long and straight sparse light setae ( Figs 1 View FIGURE 1 A, B).

Metasoma ( Fig. 1 View FIGURE 1 A). Petiole 1.5 times longer than wide, completely covered by long whitish hairs; metasoma post petiole in dorsal view about 1.6 times longer than wide, with sparse specialized setae.

Male ( Fig. 3 View FIGURE 3 A). Body color slightly lighter than female. Antenna ( Fig. 3 View FIGURE 3 B) 14 -segmented, relatively short and strong, A 4 –A 13 distally knotted with row of verticillate bristles, antennomeres in proportions: (7.3: 1.6), (1.7: 0.9), (1.9: 0.7), (2: 0.7), (2: 0.7), (2: 0.7), (2: 0.7), (2: 0.5), (0.7: 0.4), (0.7: 0.4), (0.5: 0.4), (0.4: 0.4), (0.4: 0.4), (1.7: 0.4).

Material examined: Holotype, female (MZUSP); paratypes, female and male (MLEF); paratypes, female and male (UFPR); 4 females and 18 males (MLP): Bom Jardin (22 ° 0 9 07'S e 42 ° 25 ' 10 '' W), Río de Janeiro, Brazil, V- 2011, Moreira coll.

Diagnosis. This species differs from other Szelenyiopria   species by the combination of the following characters: clava strong, anterior scutellar pit rather deep, and median keel only moderately produced anteriorly. Szelenyiopria talitae   is similar to the species of [S. pilosa-S. coriacea-S. lucens-S. pampeana   ] clade (Loiácono & Margaría 2000) by head ratio; POL>LOL ( S. lucens   and S. pampeana   ); hind wing proportions ( S. coriacea   ); gaster short, keel sculpture of propodeum ( S. pilosa   ).

Etymology. The new species is named in honor of Mrs. Talita de Oliveira Moreira, mother of one of the authors (D.D.O.M.).

Biology. In this study, we found that Szelenyiopria talitae   attacks mature larvae of A. subterraneus   . subterraneus   . All larvae parasitoidized belong to worker forms of the ants and were easily recognized by the dark coloration through the cuticle where the wasps were developing ( Fig. 4 View FIGURE 4 A). Szelenyiopria talitae   is predominantly a solitary parasitoid, but can be gregarious with two to 10 wasps per larva ( Fig. 4 View FIGURE 4 B). Each larva contains wasps of one sex. The September nest was 100 % parasitized (510 ant larvae) but the percentage of parasitoidism of the other nest could not be established. Inside the fungus chamber it was possible to see worker ants taking care of larvae attacked ( Fig. 4 View FIGURE 4 D) as if they were healthy larvae ( Fig. 4 View FIGURE 4 C).