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
