Fig. 4.

Morphology of L4 of B. malayi. a Cephalic extremity of 9 dpi, male larva, lateral view. b Region of vulva of 9 dpi larva, ventral view; note future canal of vagina (arrow). c Developing female reproductive system of 9 dpi larva, ventral view; note region of vulva (arrow) and precursor cell of ovary (arrowhead). d Cephalic extremity of 21 dpi, male larva, lateral view; note hyaline tissue around buccal cavity. e Cephalic extremity of 21 dpi, female larva, lateral view. f Posterior body end of 27 dpi male larva, lateral view; note development of caudal papillae (arrowheads) and right spicule (arrows). Scale bars in micrometers