Szelenyiopria pampeana (Loiácono)

Loiácono, Marta S. & Margaría, Cecilia B., 2009, A note on Szelenyiopria pampeana (Loiácono) n. comb., parasitoid wasps (Hymenoptera: Diapriidae) attacking the fungus growing ant, Acromyrmex lobicornis Emery (Hymenoptera: Formicidae: Attini), Zootaxa 2105, pp. 63-65: 63-65

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Szelenyiopria pampeana (Loiácono)

n. comb.

Szelenyiopria pampeana (Loiácono)  n. comb.

Gymnopria pampeana Loiácono  in Loiácono et al. 2000: 10.

Remarks: Masner and García (2002) considered Gymnopria Loiácono  as junior synonym of Szelenyiopria Fabritius  by comparison with material type-species. Here, S. pampeana  is considered as a new combination. Szelenyiopria pampeana (Loiácono)  is similar to S. lucens (Loiácono)  but differs by the coriaceous sculpture of head and mesosoma; scarcely pilosity of cheeks and anterior margin of prothorax; and wider first segment of antennal club.

Among the Diapriinae  the Diapriini  is the only tribe that includes truely symphilic species, some of them remarkably adapted morphologically to life with ants; these adaptations include extensive mimicry of the host ants which may include convergences in sculpture, pilosity, color behavior, and biology. Members of the genus Szelenyiopria  share no specialized structures known from other myrmecophilic diapriini  ; but there is evidence of setae with truncate apices which were considered by Masner and García (2002) to be specialized structures, possibly as outlets for chemical substances ( Fig. 2 aView FIGURE 2. a).

Distribution: Argentina: La Pampa: Santa Rosa (36 º 62 ’ S, 34 º 28 ’ W) and La Reforma (37 º 55 ’, S 66 º 23 ’W).

Biology: Szelenyopria pampeana  is known as a koinobiont and gregarious endoparasitoids of larvae of late instars of Acromyrmex lobicornis Emery ( Loiácono et al. 2000)  .

Parasitized larvae of A. lobicornis  were easily recognized by the dark coloration of the cuticle caused by the developing wasps ( Fig. 1View FIGURE 1 b). All parasitized larvae belong to the reproductive forms of the ants, which can be recognized by the peculiar “ancoriforme” pilosity ( Fig. 2View FIGURE 2. a b) (Covello de Zolessi and González 1974). In this study, we verified that S. pampeana  attacks both nests of A. lobicornis  in two locations of La Pampa province; all recovered wasps were females ( Fig. 1View FIGURE 1 e), and solitary parasitism was predominant. From the 33 ant larvae parasitized at La Reforma, 26 showed solitary parasitism ( Fig. 1View FIGURE 1 c) and five larvae were gregariously parasitized with up to three diapriids per larva ( Fig. 1View FIGURE 1 a, b). These results are not similar that those of Loiácono et al. 2000 for S. pampeana  : the authors recovered in some cases, both sexes from a single host. Further, the number of wasps per larva ranged from 1 to 22; gregarism was predominant and the coexistence of two diapriid species of different genera was found ( S. pampeana  and Trichopria formicans Loiácono  ). Loiácono et al. (2000) colected 1560 wasps (adults and inmatures) from 430 parasitized larvae from three partial colonies of A. lobicornis  , which shows how aggressive these wasps can be in attacking the ants. Fernández-Marín et al (2006) suggest that these minute wasps present excellent opportunities to explore the hypothesis that parasitoid wasps regulate host population density and community structure both through indirect and direct effects.














Szelenyiopria pampeana (Loiácono)

Loiácono, Marta S. & Margaría, Cecilia B. 2009


Gymnopria pampeana Loiácono

Loiacono 2000: 10