Slate-drake
Guides
Isonychia arida
arid howdy mayfly
Isonychia arida is a species of brushlegged mayfly in the family Isonychiidae. It was described by Thomas Say in 1839, originally as Baetis arida. The species is found in North America and is known by the common name "arid howdy mayfly." Like other members of the genus Isonychia, it belongs to a group commonly referred to as "slate drakes" by anglers.
Isonychia georgiae
Isonychia georgiae is a brushlegged mayfly species in the family Isonychiidae, first described by McDunnough in 1931. It is part of the order Ephemeroptera, an ancient lineage of aquatic insects dating to the Carboniferous period. Like other Isonychia species, it is known to anglers as a "slate drake" mayfly. The species is documented from North America.
Isonychia intermedia
Isonychia intermedia is a species of mayfly in the family Isonychiidae. Like other members of its genus, it is an aquatic insect with a life cycle consisting of an extended nymphal stage in freshwater habitats followed by a brief adult stage. The species is found in North America and is part of the EPT (Ephemeroptera-Plecoptera-Trichoptera) assemblage used in water quality biomonitoring. Adults are known to anglers as 'slate drakes' due to their dark wing coloration.
Isonychia tusculanensis
Isonychia tusculanensis is a species of brushlegged mayfly in the family Isonychiidae, described by Berner in 1948. It belongs to a genus commonly referred to as "slate drake" mayflies. Like other members of the order Ephemeroptera, it has an aquatic nymphal stage and a short-lived adult stage. The species is documented from North America.