Major Groups | Insecta (insects) | Ephemeroptera (mayflies) | Caenidae |
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2(1). 1st abdominal tergite with setae; gill covers usually with long setae dorsally (NOT referring to the fringe of setae), setae are visible on specimens greater than 1 mm long
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-1st abdominal tergite without setae; gill covers without long setae dorsally Note: The setae on 1st abdominal tergite may not always be visible in Tasmanocoenis which has gill covers with setae.
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