Morphology of antennae ofDendroctonus vitei(Coleoptera: Curculionidae: Scolytinae), with special reference to sensilla clustered into pit craters

Abstract

AbstractAs reported recently by the authors, the third and fourth antennomeres of the antennal club of the bark beetleDendroctonus viteiWood (Coleoptera: Curculionidae: Scolytinae) possess conoid sensilla clustered inside spherical or bulb-shaped invaginations of the cuticle that resemble geological pit craters. These structures are novel relative to otherDendroctonusErichson species examined. The morphology and ultrastructure of different sensilla types on the antennal club and within the pit craters ofD. viteiare herein described in detail with the aid of light, environmental scanning electron, and transmission electron microscopy. Five types of sensilla were found: fluted, basiconica type I, and trichodea types I, II, and III. The pit craters were composed of clusters of multiporous sensilla basiconica arising from the inner surface of the concavities, and the morphology and ultrasructure of these sensilla are consistent with an olfactory function. The presence of pit craters in theD. viteion the anterior side of the antennal club is an diagnostic character for this species and an autapomorphy of great taxonomic importance within theDendroctonus frontalisZimmermann species complex.