» Family Heptageniidae (March Browns, Cahills, Quill Gordons)
3 genera aren't included.
This is page 20 of specimens of Heptageniidae. Visit the main Heptageniidae page for:
- The behavior and habitat of Heptageniidae.
- 11 underwater pictures of Heptageniidae.
Pictures of 194 Mayfly Specimens in the Family Heptageniidae:
Maccaffertium modestum (Cream Cahill) Mayfly Nymph
View 2 PicturesI looked at this nymph closely under my crappy microscope. It has truncate (Truncate: Cut off. This is often used to describe the square appearance of the gills of Maccaffertium mayfly nymphs, for example, as opposed to the pointed gills of the closely related genus Stenacron.) as opposed to rounded gills, postero-lateral (Lateral: To the side.) spines only on abdominal segments 7-9, and oblique crossbars through the center of each sterna, not on the posterior (Posterior: Toward the back of an organism's body. The phrase "posterior to" means "in back of.") edge like on some of the other Maccaffertium species. As best I can tell from the keys this is either modestum or ithaca and from the distribution maps I've seen I'm guessing it's modestum.