Kingdom Animalia Subphylum Vertebrata Order Arthrodira Rank Genus | Phylum Chordata Class Placodermi Suborder Brachythoraci | |
 | ||
Similar Melanosteus, Pachyosteus, Rhinosteus, Enseosteus, Belemnacanthus | ||
Gymnotrachelus hydei is a large selenosteid arthrodire placoderm known from the Late Famennian Cleveland Shales of Ohio. It was originally reconstructed as physically resembling Selenosteus, with slightly smaller orbits (i.e., having a broad, box-like head). Later specimens led to a reappraisal, and now G. hydei is thought to have a more gar-like or barracuda-like build.
References
Gymnotrachelus Wikipedia(Text) CC BY-SA