B
Order Family Lebanese Burmese Canadian
145.5 mya 65.5 mya
Ephemeroptera Ametropodidae (mayflies) Australiphemeridae
Baetidae Behningiidae* Epeoromimidae* Ephemerellidae Euthyplociidae* Heptageniidae Hexagenitidae* Leptophlebiidae Mesonetidae* Oligoneuriidae Palaeoanthidae* Palingeniidae Polymitarcyidae Potamantidae* Prosopistomatidae* Siphlonuridae Torephemeridae* undetermined
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