Stenostola dubia (Laicharting, 1784)

Kvamme, Torstein, Wallin, Henrik & Kvie, Kjersti S., 2012, Taxonomy and DNA barcoding of Stenostola ferrea (Schrank, 1776) and S. dubia (Laicharting, 1784) (Coleoptera, Cerambycidae, Saperdini), Norwegian Journal of Entomology 59, pp. 78-87 : 81

Stenostola dubia

Aedeagus: approx. 1.6 mm long, slender, narrowed and weakly curved towards the relatively sharp, pointing apex, ventral ridge slightly wider than dorsal ridge at apex. The crescent-shaped sclerites at the proximal end of the basal segment consist of four separate parts (two rectangular and two crescent-shaped) ( Figure 2 ), and three elongated median sclerites (approx. 1.8 mm long) inside the internal sac forming a slightly bent thread with the posterior end most narrowed and straight ( Figure 3 ); surrounding intersegmental membrane with very fine, speckled microreticulation. Tegmen: approx. 1.6 mm long, parameres slender and flattened dorsoventrally, well separated medially along inner margin and towards apex forming a “U-shaped” cavity. Apex evenly rounded along entire posterior margin, with fringes of relatively long, yellowish hairs well concentrated at edge of apex. No microreticulation on parameres. Base of tegmen, at lower part of median lobe, extended and weakly curved dorsoventrally on middle. Tergite VIII: approx. 0.4 mm long, with fine, brownish pigmentation, rounded at the posterior margin, and covered with short, very fine yellowish hairs distally towards the posterior margin. Surface has weak microreticulation medially. Spermatheca: approx. 0.12 mm wide, round and brownish ( Figure 4 ).

Figures

FIGURE 2. The crescent-shaped sclerites at the proximal end of the basal segment of Stenostola dubia (Laicharting, 1784) (left) and S. ferrea (Schrank, 1776) (right) (Photo H. Wallin).

FIGURE 3. The elongated median sclerites inside the internal sac of Stenostola dubia (Laicharting, 1784) (above) and S. ferrea (Schrank, 1776) (below) (Photo H. Wallin).

FIGURE 4. The crescent-shaped sclerites at the proximal end of the basal segment of Stenostola dubia (Laicharting, 1784) (left) and S. ferrea (Schrank, 1776) (right) (Photo H. Wallin).