Tiny Sulphur Duns
Like most common names, "Tiny Sulphur Dun" can refer to more than one taxon. For more detail click through to the scientific names.
Mayfly Genus Centroptilum
These are very rarely called Tiny Sulphur Duns.
Like Brachycentrus, these very small mayflies usually inhabit water too warm and/or stagnant for trout. Their emergence behavior further reduces their importance. I have found no reports of important Centroptilum hatches on trout water.
Centroptilum album is the species most often mentioned in fly fishing literature.
Centroptilum album is the species most often mentioned in fly fishing literature.
Mayfly Genus Procloeon
These are very rarely called Tiny Sulphur Duns.
This genus is not well-known to fly fishers yet because most of its species were, until very recently, classified as either Centroptilum or Cloeon.
These mayflies may be abundant enough to cause fishable hatches in spite of their tiny size.
It's difficult to discern from previous angling literature exactly which statements now apply to Procloeon, because its species come from other little-known genera and the accounts for them conflict. They were mentioned in combination with other genera, adding to the confusion. So the information below is highly tentative and, where accounts seem to conflict, both have been given.
These mayflies may be abundant enough to cause fishable hatches in spite of their tiny size.
It's difficult to discern from previous angling literature exactly which statements now apply to Procloeon, because its species come from other little-known genera and the accounts for them conflict. They were mentioned in combination with other genera, adding to the confusion. So the information below is highly tentative and, where accounts seem to conflict, both have been given.
New features!
