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Order Ephemeroptera - Mayflies

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Mayfly - Isonychia Mayfly - Isonychia Mayfly - Isonychia Ephemeroptera sp. - Isonychia Pennsylvania Mayfly for ID - Isonychia Pennsylvania Mayfly for ID - Isonychia Pennsylvania Mayfly for ID - Isonychia Black Mayfly - Isonychia Black Mayfly - Isonychia Mayfly sp - Isonychia Mayfly sp - Isonychia Mayfly sp - Isonychia Mayfly - Isonychia Mayfly - Isonychia mayfly - Isonychia - male Pennsylvania Mayfly for ID - Isonychia Pennsylvania Mayfly for ID - Isonychia Mayfly - Isonychia Mayfly - Isonychia mayfly - Isonychia - female Mayfly - Isonychia Mayfly - Isonychia Mayfly - Isonychia Mayfly - Isonychia

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