Fig. 4

Scanning electron micrographs of H. aegyptium nymph body parts. a Capitulum of control nymph showing hypostome (H) with laterally located palps (P), basal capitula (BC) and sensillae (S). b Capitulum of treated nymph with cracks (arrow) in basal capitula (BC), erected chelicera (Ch) hiding damaged hypostome (H) and loss of one palp (P). c Enlarged portion of control nymph integument showing integumental folds (F) with sensillae (S). d Enlarged portion of treated nymph integument showing scattered alga powder (A) forming cracks (arrow) with less numerous folds (F). e Enlarged portion of nymph integument after 11 days of feeding appeared the beginning of molting process (arrow) with shed of integument (Int). f Enlarged portion of nymph integument after 11 days of treatment with embedded alga powder (A) forming warts (W) and increasing cracks (arrow). g Enlarged posterior portion of control nymph integument (Int) with folds (F) and lamellae (L) forming dome-like structures bearing setae (S). h Enlarged portion of treated nymph integument (Int) with slightly shed parts and molted alga powder (A). I Leg of control nymph contains 7 segments; coxa (Co), trochanter (Tr), femur (F), patella (Pa), tibia (Ti), metatarsus (M) and tarsus (Ta), and ended with pretarsus (pTa) and 2 claws (Cl). J Leg of treated nymph with scattered alga powder (A), loss of segments except coxal one (Co) that loss some sensillae (S).