Fig 4. SEM from Pre-Defecating Larva (PDL) of M. scutellaris.

(A) Panoramic view of the anterior region, including part of the larvae body. (B) Frontal view of the head showing ocular lobe (ol), antennal lobe (al), clypeus (co), and mandible (ma). (C) Clypeus area showing sensilla-like structures, which are highlighted in (D)—arrows indicate small “black dots” that are orifices at the base of the structure. (E) View of antennal lobe region with four structures similar to immature sensilla, two of which were highlighted (F) in higher magnification. (G) Mandible region also showing structures similar to immature sensilla, which are emphasized in higher magnification in (H) with small orifices indicated by arrows.