THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands |
Identify taxa Jointed legsSix legs Ephemeroptera Uncommon in wetlands |
| Ameletidae (comb-mouthed mayfly) Gills with a sclerotized (hard) dark band along the outside margin; mouthparts with a comb of stiff spines; antennae are shorter than twice the width of the head |
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| Baetiscidae (armored mayflies) The top of the thorax is broad and covers several abdominal segments and has processes that point away from the body |
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| Heptageniidae (flat-headed mayflies) Body very flattened with head flattened such that the eyes and antennae are visible from above, but the mouthparts are only visible from below; legs stick out to the sides; 2 or 3 cerci |
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| Oligoneuriidae (brush-legged mayflies) Have long hairs but the gills on the first abdominal segment are on the underside (ventral) instead of sticking out to the sides (lateral); body is minnow-like |
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| Polymitarcyidae (pale burrowers) Similar to Ephemeridae, gills long with a feather-like fringe; but tusks don't curve upward when seen from the side and have small spines on the half of the tusk closest to the head |
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