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Entomologia Agraria - Pisa
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Facoltà di Agraria - Pisa
AGRARIA PISA

XX International Congress of Entomology - Firenze, Italy, August 25-31, 1996


MALE ANTENNAL STRUCTURES OF SOME PARASITOID ACULEATA (HYMENOPTERA) POSSIBLY INVOLVED IN SEXUAL RECOGNITION.

P.L. Scaramozzino 1, G. Pagliano 2, R. Antonelli 3, N. Isidoro 4, F. Bin 4 .

Scanning Electron Microscopy observations of male antennae of numerous species of parasitoid Aculeata belonging to several families (Sapygidae, Tiphiidae, Mutillidae, Eumenidae, Pompilidae, Sphecidae) have shown the presence of modified cuticular areas, sometimes hairless, with peculiar sculpture and pores. These areas often correspond to "tyloids" that are considered to be sensory structures. The pores may be the opening of glandular canals, so that further investigation with Transmission Electron Microscopy are in progress to confirm such an hypothesis. These male cuticular areas are probably involved in the chemical stimulation of the female antennal sensilla during mating behavior, as it happens in some species of parasitoid Parasitica showing similar structures with proven secretory function (Isidoro et al., 1996). The presence of this type of cuticular areas in male antennae of non parasitoid Aculeata, like Vespidae, Anthophoridae and Andrenidae, suggests this phenomenon may concern many more groups of Hymenoptera.

Figures:

Sapygidae (Scolioidea) - Mutillidae e Tiphiidae (Scolioidea), Pompilidae (Pompiloidea) - Eumenidae (Vespoidea) - Sphecidae 1 (Sphecoidea) - Sphecidae 2 (Sphecoidea) -
Vespidae (Vespoidea) - Andrenidae e Anthophoridae (Apoidea)

Bibliography:
Isidoro N., F. Bin, S. Colazza and S.B. Vinson, 1996 ­ Morphology of Antennal Gustatory Sensilla and Glands in Some Parasitoid Hymenoptera With Hypothesis on Their Role in Sex and Host Recognition. J. Hym. Res., 5: 206­239.

Explanation of symbols used in the poster: 5
A = antennomere(a)
P = pore(s)
PL = placoid(s)
SPA = specialized porous area(s)
T = tyloid(s)


Notes:
1 Museo Regionale di Scienze Naturali, Torino, Italy.
2 Dip. Entomologia e Zoologia applicate all'Ambiente "Carlo Vidano", Università di Torino, Italy.
3 Dip. C.D.S.L., Sez. Entomologia agraria, Università di Pisa, Italy.
4 Istituto di Entomologia agraria, Università di Perugia, Italy.
5 Graphic and Photographic elaboration by Studio Guido Fino, Torino, Italy.

Web Author:
Riccardo Antonelli
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