Major Groups | Insecta (insects) | Ephemeroptera (mayflies) | Caenidae Note: Key from Suter 1999 |
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1. Mesonotum with distinct lateral lobes; 9th sternite produced posteriorly, with a truncated triangular projection, concave apically
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-Mesonotum without lateral lobes; 9th sternite not produced posteriorly, usually convex
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