Achanthiptera rohrelliformis, thorax and abdomen of third-instar larva [SEM]. A third thoracic and first abdominal segments, lateral view, dorsal side up. B Keilin’s organ on ventral side of third thoracic segment. C pre-anal welt on seventh abdominal segment, ventral view. D bubble membrane. E posterior spiracles. F sub-anal papilla. G posterior end of body, lateral view. H anal division, posterior view. I posterior end of body, ventral view. — Abbreviations: a1, abdominal segment 1; a7, abdominal segment 7; ad, anal division; ao, anal opening; ap, anal plate; ex, extra-anal papilla; p1–p7, papillae 1–7 surrounding spiracular field; pa, post-anal papilla; paa, para-anal papilla; pre, pre-anal welt; ps, posterior spiracle; rs, respiratory slit; sa, sub-anal papilla; ss, spiracular scar; st, spiracular tuft; t3, thoracic segment 3.