Ultrastructure of chemical sensilla on the antennae and mouthparts of the larvae of Tomicus minor(Coleoptera:Curculionidae:Scolytinae)
[Aim]To investigate the type,number,and distribution of chemical sensilla on the antennae and mouthparts of the lar-vae of Tomicus minor(Coleoptera:Curculionidae:Scolytinae).[Method]Chemical sensilla on the larval head of the last instar T.minor was examined using scanning electron microscopy.[Result]The larval antennae of T.minor have only one segment that bears six types of sensilla,including sensilla basiconica 1-2 and sensilla twig basiconica 1-4.Both the maxillary and labial palps consist of two segments with five sensory organ types.These were identified as sensilla basiconica 3,sensilla digiformia,and sensilla twig basiconica 2,4,and 5.Sensilla basiconica 1-3 with multiple surface pores may play a typical role in odor sensing of chemicals in the larval gallery.Sensilla twig basiconica with tip pores should be interpreted as having a gustatory function.Sensilla digitiformia with a smooth and nonporous surface were presumed to be sensible to sound production in Scolytinae because only one sensilla digi-formia was found on the lateral view of the maxillary palp.[Conclusion]Chemical sensilla on the larval head of the last instar of T.minor exhibited a low abundance,a simple distribution pattern,and an unchanged concentration on the tips of the antennae,maxil-lary,and labial palp.The findings of this study are expected to provide further scientific data for a deeper understanding of the feed-ing and related behaviors of the larvae of T.minor under bark.
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