Sense organs in antennae of Jaliscoa hunteri (Hymenoptera Pteromalidae)
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2018, Department of Agricultural and Food Sciences. All rights reserved. Parasitoid antennae play fundamental roles in the host acceptance and location processes. The functions of antennal sensory organs can be inferred based on their types, quantities, and distributions. The objective of this study was to describe the external sensilla present in the antennae of male and female Jaliscoa hunteri (Crawford) (Hymenoptera Pteromalidae), an ectoparasitoid of species of Curculionidae and Bruchidae (Coleoptera), using electron scanning microscopy. Seven morphological types of sensilla were found on antennae of both males and females: four poreless trichoid sensilla (ST1-AP to ST4-AP), one multipored plate sensillum (MPS), one unipored chaotic sensillum (ChS-UP), and one basiconic capitate sensillum (BCS). We recorded the abundance and distribution of these sensilla types on antennae of both sexes. Overall, we found differences in abundances of ST1-AP, ST2-AP, ST3-AP, MPS and ChS-UP sensilla, as well as in distribution and abundance of BCS sensilla between males and females, indicating sexual dimorphism in the antennae of J. hunteri. Based on their presence, abundance and distribution, and following available, published information, we discussed some plausible functions of the antennal sensilla of J. hunteri, such as perception of vibrations (mechanoreception) and odors (chemoreception).