Keys to Mayflies - Swimmers
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Identifying Characteristics of Swimmers
Nymphs
1) Round and streamlined body.
2) Tails are fringed with fine hair.
3) Oval gills are positioned on the side of the abdomen.
Adults
1) Small body size.
2) Base of veins MP2 and CuA do not diverge from the base of MP1.
3) Two or three tails are present.
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Mayfly Swimmer Nymph
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Mayfly Swimmer Wing
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Illustration by Andy Cooper
| TABLE OF MAJOR MAYFLY SWIMMER HATCHES |
| Families |
Genera |
Species |
Common Name |
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| Baetidae |
Baetis |
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Blue-Winged Olive |
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Callibaetis |
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Speckle-Wing Quill |
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Pseudocleon |
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Tiny Blue-Wing Olive |
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| Siphlonuridae |
Siphlonurus |
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Black or Gray Drake |
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Ameletus |
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Dark Brown Spinner |
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Isonychia |
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White-Gloved Howdy |
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