81a (80b). Mouthparts distinctly mandibulate, with opposable mandibles;
spiracles usually
present on
thorax and 8 abdominal segments; body shape variable [beetle larvae].....Coleoptera
81b. Mouthparts as previously described or with mouth hooks somewhat
parallel and moving
vertically;
spiracles variable, but usually not as previously described; body elongated
[Nematocera & some
Brachycera fly
larvae]....................................................……................. Diptera