Ischadites is a receptalculitid alga reported only from Ordovician rocks in Oklahoma.
![Algae fossil](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Ischadites-00014019.jpg)
![Algae fossil](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Ischadites-00014019-996x1024.jpg)
Ischadites iowensisOPC 3252-14019; Ischadites iowensis (Owen 1852) emend. Decker and Merritt 1931; Algae; Middle Ordovician; Bromide Formation, Simpson Group; Murray County, Oklahoma; CC BY-NC-ND 4.0