Cathlesichthys is an extinct genus of homostiid arthrodire from Wee Jasper, during the Early Devonian.[1]
The generic epithet honors Ian and Helen Cathles, being a compound of their surname combined with the Greek word for fish ιχθύς (ichthýs). The specific epithet refers to the location of where it was found (Wee Jasper).
Cathlesichthys is known from an incomplete paranuchal, and nuchal plates, attaining a skull length of around 20 cm.