Fig. 4

The mouth parts: a, b SEM of strain TNV ventral view of head capsule with hypognathous type and chewing mouthparts. c Mandibles with undulate margin and spines on internal surface (mx maxilla, md mandible, mxp maxillary palp, lbp labial palp, ca cardo, ga galea, li ligula, mnt mentum, sti stipes)