» Order Ephemeroptera (Mayflies)
8 families aren't included.
This is page 4 of specimens of Ephemeroptera. Visit the main Ephemeroptera page for:
- The behavior and habitat of Ephemeroptera.
- 67 underwater pictures of Ephemeroptera.
- 1 streamside picture of Ephemeroptera.
Pictures of 692 Mayfly Specimens:
Male Baetidae (Blue-Winged Olives) Mayfly Nymph
View 10 PicturesThis male nymph is probably in its final instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.). The wing pads (
Wing pad: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.) are extremely black and the large turbinate (
The wing pads on this final instar Baetidae
mayfly nymph are extremely dark.
Turbinate: Shaped like a top or elevated on a stalk; usually refers to the eyes of some adult male Baetidae mayflies which are wider near the tip than at the base.) eyes are very apparent inside the nymph's head.
This male Baetidae
dun has slightly turbinate eyes.
Male Nixe inconspicua Mayfly Dun
View 13 PicturesThis pretty little dun was part of a sparse midsummer evening hatch on a large Catskill river.
I could not identify it by following a species key step by step, but I tentatively keyed it to the genus Nixe, and based on distribution maps and physical descriptions the most likely species is Nixe inconspicua.
Male Rhithrogena virilis Mayfly Spinner
View 12 PicturesI'm fairly sure this is a specimen of Rhithrogena virilis based on closeup examination of the reproductive anatomy under the microscope (not shown in photos). The other other species of Rhithrogena this large is Rhithrogena flavianula, but the key in Needham's Biology of Mayflies mentions annulation in the abdomen (visible in some images on bugguide.net) more distinct than that on this specimen.
The body and front wing were both about 15.5 mm long, while the cerci (Cercus: The left and right "tails" of an insect are known as the cerci or caudal cerci. The middle tail of a three-tailed insect is not.) were 40 mm long.