The Antennal Sensilla of Species of the Palpalis Group (Diptera: Glossinidae)

Infection of tsetse fly with trypanosome parasites could be influenced by its ability to locate vertebrate host(s) in the wild. Generally, the antennae of insects are known to bear chemo-sensory organs (sensilla), which are used for host search among other functions. In order to exploit the potentia...

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Bibliographic Details
Published in:Journal of medical entomology 2015-07, Vol.52 (4), p.614-621
Main Authors: Isaac, Clement, Ravaiano, Samira Veiga, Pascini, Tales Vicari, Martins, Gustavo Ferreira
Format: Article
Language:English
Subjects:
Animals
antenna
antennae
Arthropod Antennae - anatomy & histology
Arthropod Antennae - ultrastructure
Diptera
Female
females
flagellum
Glossina palpalis
Glossina tachinoides
Glossinidae
Glossinidae - anatomy & histology
Glossinidae - ultrastructure
host search
insects
Male
males
Microscopy, Electron, Scanning
MORPHOLOGY, SYSTEMATICS, EVOLUTION
Niger
Nigeria
parasites
pedicel
scanning electron microscopes
scanning electron microscopy
sensilla
Sensilla - anatomy & histology
Sensilla - ultrastructure
Trypanosoma
tsetse fly
vertebrates
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Summary:Infection of tsetse fly with trypanosome parasites could be influenced by its ability to locate vertebrate host(s) in the wild. Generally, the antennae of insects are known to bear chemo-sensory organs (sensilla), which are used for host search among other functions. In order to exploit the potentials of tsetse-search behavior, knowledge of sensilla types on the antennae is desirable. In line with this, the dorsal and ventral surfaces of the antennae of Glossina palpalis and Glossina tachinoides (Westwood) were examined under the scanning electron microscope. Results showed that trichoid and chaetica (subtypes I and II) sensilla are present only on the scape and pedicel, while basiconica (subtypes I and II) and sensory pits are seen on the flagella. Microtrichia are present on all the segments of the antennae with Ca II being most abundant. Specifically, in females of G. tachinoides, there is a near-even distribution of Ca I and Ca II on the pedicel while more number of sensory pits was seen on females than males in both species. This study hypothesizes that host-search efficiency could be influenced by the number of olfactory-sensilla types on the antennae, in which case, females present greater potentials.
ISSN:0022-2585
1938-2928
DOI:10.1093/jme/tjv050