Invertebrate Photographs - Ephemeroptera (mayflies)

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All photographs marked with ESC were taken at USEPA's Region 3 Environmental Science Center at Fort Meade, Maryland. Many thanks to Dr. Dave Russell, invertebrate biologist, for arranging the instruction and assistance with the use of the Olympus SZX12 miscroscope with an Olympus model DC330 optical mount. Also see our page on mayflies for more information.

Mayflies (Ephemeroptera)

*Ameletus sp.* Ameletidae ESC	*Ameletus sp.* Ameletidae Note pectinate spines on maxilla. ESC	Acentrella sp. Baetidae
Baetisca sp. Baetiscidae ESC	Baetisca sp. Baetiscidae Note: Thoracic notum enlarged to form a shield to abdominal segment 6. ESC	Baetisca sp. Baetiscidae
Brachycercus sp. Caenidae	Danella sp. Ephemerellidae	Heterocleon amplum Baetidae
*Caenis sp.* Caenidae Note: undeveloped hind wing pads (top); operculate gill on abdominal segment 2. ESC	*Caenis sp.* Caenidae Note: operculate gill on abdominal segment 2. ESC	*Caenis sp.*Caenidae - ventral view ESC
*Ephemerella sp.* Ephemerellidae ESC	*Ephemerella sp.* Ephemerellidae ESC	*Ephemerella sp.* Ephemerellidae ESC
Eurylophella sp. Ephemerellidae Note operculate gill. ESC	Eurylophella sp. Ephemerellidae Note: operculate gill. ESC	Leptophlebia sp. Leptophlebiidae
Maccaffertium sp. _Heptageniidae	Isonychia sp. Isonychiidae	Pseudocentroptiloides sp. Baetidae
*Paraleptophlebia sp.* Leptophlebiidae ESC	*Paraleptophlebia sp.Leptophlebiidae Note: forked abdominal gills. ESC*	*Paraleptophlebia sp.* Leptophlebiidae (ventral view) ESC
Ephemerella septentrionalis Ephemerellidae	Siphloplecton sp. Metretopodidae	Callibaetis sp. palp
Ephemeridae ESC	Ephemeridae ESC	Ephemeridae (note lateral gills) ESC
Stenonema pudicum Heptageniidae Note: rounded gill apex. ESC	Stenonema pudicum Heptageniidae Note: Gill on segment 6 smaller than others. ESC	Medial tail filaments in Baetis sp.

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Invertebrate Photographs - Ephemeroptera (mayflies)

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