Couplet 9
9a: Body 1-5 mm long; fore tarsus with 5 distinct tarsomeres; eyes usually normally developed Noteridae p. 405
9b: Body usually > 6 mm long, if smaller, then scutellum visible, or fore tarsus pseudotetramerous, or compound eyes absent or greatly reduced in size and indistinct Dytiscidae p. 405
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