Ultrastructure of antennal sensilla of Cistogaster globosa (Fabricius, 1775) и Cylindromyia interrupta (Meigen, 1824) (Diptera: Tachinidae)

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The paper describes the ultrastructure of antennal sensilla among two species of tachinid flies (Diptera: Tachinidae). For this purpose, the antennae of the adult flies Cistogaster globosa (Fabricius, 1775) and Cylindromyia interrupta (Meigen, 1824) were examined using a scanning electron microscope (SEM). The choice of antennae as structures for studying the receptor organs is explained by the fact that among insects they are the main site of sensilla localization. There is also a high degree of oligomerization of the antenna segments, which determines the concentration of sensilla on the apical segment in the short-tied circular-seam Diptera (Brachycera-Cyclorrhapha), to which the family Tachinidae also belongs. Most of antennal sensilla are morphologically independent elementary sensory formations. Each type of such sensory formations is responsible for one or more functions. Three types of sensilla were identified (trichoid, basiconic and coeloconical) as a result of the analysis of two tachinid species antennae. Trichoid and basiconic sensilla were found among the tachinid fly Cistogaster globosa, and trichoid and coeloconical sensilla were found among Cylindromyia interrupta. A large number of microtrichia was also found on the antenna elements in both tachinid species. Original SEM-images of the ultrastructural organization of the tachinid sensory system are provided; their localization and number per unit area are shown. The obtained data expand our understanding of the role of these morphological structures in the orientation of tachinid fly in the implementation of the reproductive strategy: search for a sexual partner, search for a potential host habitat, and search for a host.

About the authors

Evgeniy Vasilyevich Aksenenko

Voronezh State University

Author for correspondence.
Email: entoma@mail.ru

candidate of biological sciences, associate professor of Zoology and Parasitology Department

Russian Federation, Voronezh

Mikhailovna Anna Kondratyeva

All-Russian Research Institute of Forest Genetics, Breeding and Biotechnology

Email: knyuta_2007@mail.ru

candidate of biological sciences, senior researcher of Forest Genetics and Biotechnology Department

Russian Federation, Voronezh

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2. Figure 1 - Sensory formations of the tachyna antennas of Cistogaster globosa: a - general view of the head tagma; b - general view of antennas (Sc - scape, Ped - pedicel, Fl₁ - first flagellomer, Ar - arista); c - fragment of the surface of the scape with microtrichia; d - pedicel surface with trichoid sensilla (Tr); e - fragment of the surface of the first flagellomere (B - basiconic sensilla, M - microtrichia); f - base of arista

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3. Figure 2 - Sensory formations of the tachyna antennas of Cylindromyia interrupta: a - general view of the head tagma; b - scape surface; c - pedicel surface with trichoid sensilla (Tr); d - general view of flagellum with whole-conical sensilla (Co); e - surface of the first flagellomer with trichoid sensilla; f - surface of the first flagellomer with coelomic sensilla (Co) located among microtrichia; g - whole-conic sensilla (Co) and microtrichia (M) on the first flagellomer; h - base of arista

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Copyright (c) 2021 Aksenenko E.V., Kondratyeva M.A.

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