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Speckled Spinners

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This common name refers to only one genus.

Mayfly Genus Callibaetis

These are pretty much always called Speckled Spinners.
The speckle winged Callibaetis genus contains on average the largest species in the Baetidae family with hatches ranging in size from 20 to 12 (6mm to 12mm). However, most can be matched with 14 and 16 imitations. They reside only in very slow weedy sections of rivers or lakes and ponds.

The most important are the sub-species Callibaetis ferrugineus ferrugineus in the East and Midwest and Callibaetis ferrugineus hageni in the West. It is in the West however, where this genus achieves its densest populations and most significant hatches. Other important western species also happen to be at both sides of the size scale. The outsized Callibaetis californicus can produce excellent hatches. The diminutive Callibaetis pictus can also be locally prolific, especially at higher elevations.

The duns are easily recognized by their speckled bodies and distinctive wings usually featuring a dark background overlaid with white veins. Female spinners are also easy to recognize with their clear wing's leading edges marked with dark blotches -- see the pictures.
Female Callibaetis ferrugineus (Speckled Spinner) Mayfly DunFemale Callibaetis ferrugineus (Speckled Spinner) Mayfly Dun View 3 Pictures
Collected July 14, 2004 from in
Added to by on January 25, 2006
Female Callibaetis undatus (Speckled Spinner) Mayfly SpinnerFemale Callibaetis undatus (Speckled Spinner) Mayfly Spinner View 2 Pictures
Collected May 26, 2005 from in
Added to by on June 28, 2011
Callibaetis ferrugineus (Speckled Spinner) Mayfly AdultCallibaetis ferrugineus (Speckled Spinner) Mayfly Adult View 3 PicturesThese adults are probably C. ferrugineus.
Collected August 13, 2009 from in
Added to by on June 27, 2011
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