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The larvae of Ips typographus and Ips subelongatus can cause extensive damage to coniferous trees under their bark, resulting in severe economic losses within the forestry industry. In this study, we analyzed and compared the sensilla on the antennae and mouthparts of the larvae of these two species to identify biology- and taxonomy-related differences using scanning electron microscopy. In general, no significant differences in sensilla type or distribution on the antennae and mouthparts of the larvae were observed between the two species. However, some sensilla lengths, basal widths, and quantities varied greatly between the species. Two types of sensilla were observed on the antennae: sensilla basiconica (B.a.1) and sensilla twig basiconica (T.b.1 and T.b.2). The mouthparts had five types of sensilla: sensilla trichodea (T.r.1 and T.r.2), sensilla chaetica (C.h), B.a.2, T.b.3–T.b.5, and sensilla placodea (P.l). We also discuss the function of each type of sensilla based on their morphologies and locations. The results provide a theoretical basis for further studies on the electrophysiology and feeding behaviors of I. typographus and I. subelongatus larvae. |
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