Ephemerida: there has been some confusion since, and both have been used in the Brauer sense.    From Wordnik.com.  [Explanation of Terms Used in Entomology] Reference

Bulla: a blister or blister-like structure: the shield-like sclerite that closes the opening to the trachea in lamellicorn larvae: in Ephemerida.    From Wordnik.com.  [Explanation of Terms Used in Entomology] Reference

Odonata, or of the Ephemerida.    From Wordnik.com.  [The Insect Folk] Reference

Ephemerida or Plecoptera.    From Wordnik.com.  [The Insect Folk] Reference