43a (42a).    Compound eyes large and usually contiguous; body somewhat cylindrical, with

             thorax arched; ocelli present; middle and hind coxae often with styli; abdominal styli (=

               bristlelike processes) on segments 2-9 (Fig.A)..............................................…….....Microcoryphia 

 

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                                       A

 

 

43b.    Compound eyes small and widely separated or absent; body somewhat flattened

 dorsoventrally, thorax not arched; ocelli present or absent; middle and hind coxae without styli;

 abdominal segments 1-6 (sometimes 7) without styli (Fig.A) [silverfish] ….....……..Thysanura

 

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                               A