Baetisca are members of the ‘armored mayfly’ family. So named for their hard, st
Baetisca are members of the ‘armored mayfly’ family. So named for their hard, stout, exoskeleton. These hairy extensions are the cerci of a Baetisca. Order: Ephemeroptera Family: Baetiscidae Genus: Baetisca Prince Brook, Oswego County, NY. -- source link