Family: Caenidae

Small Square-Gill Mayflies

These photos supplement pages 49-62 of the Guide to Aquatic Invertebrates of the Upper Midwest. Information on the biology of Caenidae can be found on page 57. Be careful to look at the shape of the gill. Caenidae gills are square and nearly or absolutely touching along the midline. Tricorythidae gills are triangular or oval and do not touch at the midline. Click to compare with Tricorythidae.

Caenidae

Caenidae gills Caenidae gills

Ephemeroptera

BaetidaeBaetidae
Minnow Mayflies

Baetiscidae

Baetiscidae
Armored Mayflies

CaenidaeCaenidae
Square-Gill Mayflies
 

EphemerellidaeEphemerellidae
Spiny Crawler Mayflies
 

EphemeridaeEphemeridae
Burrowing Mayflies

HeptageniidaeHeptageniidae
Flathead Mayflies
 

IsonychiidaeIsonychiidae
Brush-Legged Mayflies

LeptophlebiidaeLeptophlebiidae
Prong-Gilled Mayflies

MetretopodidaeMetretopodidae
Cleft-Footed Mayflies

PolymitarcyidaePolymitarcyidae
Pale Burrowing Mayflies

PotamanthidaePotamanthidae
Hacklegill Mayflies

SiphlonuridaeSiphlonuridae
Primitive Minnow Mayflies

TricorythidaeTricorythidae
Stout Crawler Mayflies