Hyneria was a large fish.
H. lindae is estimated around in total length. An isolated
cleithrum AM 6545 likely belongs to an individual of at least in length. Assuming this jaw fragment does pertain to
Hyneria, and assuming proportions similar to more complete
tristichopterids, it suggests
H. lindae could possibly reach lengths up to 3.5 metres (11 ft). A second species,
H. udlezinye, was once estimated as having a length of between before being described. However, the species description estimates that the largest specimen belongs to an animal about . Its body was covered by
cycloid scales. It had large sensory canals to aid in detection of possible prey, as the freshwater environment it inhabited likely was murky and had low visibility. ==Discovery==