Figure 2 shows morphological aberrations found in larvae
compared to NL. Figure 2a shows normal fourth-instar Ae.
aegypti larva (NL). Figure 2b, c shows examples of Ae.
aegypti and An. dirus which died as deformed larvae (DL).
Figure 2b (arrow) shows an elongated neck region in dead
larvae. In these forms (Fig. 2c), the thorax is enlarged
(arrow) and the respiratory tracheae and digestive tract are
not clearly visible as in a normal larva. The posterior portion
of the abdomen lacks normal larval characteristics, and the
siphon tube, saddle, and hair tufts are absent. Figure 2d–f
presents examples of Ae. aegypti which died in the pre-pupal
and pupal stages and are not completely out of the larval