Type and distribution of sensilla in the antennae of the red clover root borer, Hylastinus obscurus.
In order to determine the type, distribution, and structures of sensilla, the antennae of the red clover root borer, Hylastinus obscurus Marsham (Coleoptera: Curculionidae: Scolytinae), were examined by light and electron microscopy (both scanning and transmission). Four different types of sensilla were identified in the club, and one type of chaetica was found in the scape and funicle of both male and female individuals. Chaetica and basiconica were the most abundant sensilla types in the club. They were present in the three sensory bands described, totaling approximately 80% of sensilla in the antennal club of H. obscurus. Chaetica were predominantly mechanoreceptors, although gustatory function could not be excluded. Basiconica forms showed characteristics typical of olfactory sensilla. Trichoidea were not found in the proximal sensory band, and they exhibited abundant pores, suggesting olfactory function. Styloconica were the least abundant sensillum type, and their shape was similar to that reported as having hygro- and thermoreceptor functions. There was no difference in the relative abundance of antennal sensilla between males and females. Finally, the sensillar configuration and abundance of receptors in the H. obscurus antennae suggest that these sensilla have chemoreceptive and other functions.
1 Doctorate Program in Sciences and Natural Resources. Universidad de La Frontera, Temuco 4811230, Araucanía, Chile.
Rubén
R
Palma
Ana
A
Mutis
Rufus
R
Isaacs
Andrés
A
Quiroz
D000818:Animals; D057506:Arthropod Antennae / Q000648:ultrastructure*; D005260:Female; D008297:Male; D008465:Mechanoreceptors / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D058618:Sensilla / Q000648:ultrastructure*; D048889:Weevils / Q000648:ultrastructure*