Guntherichthys is a genus of extinct marine ray-finned fish that lived during the mid-late Carboniferous (early Pennsylvanian) in what is now Utah, United States. Fossils were recovered from the Manning Canyon Shale. The genus is named after Lloyd Gunther. As with other early ray-finned fish, it displays typical "palaeoniscoid" morphology, although this is not taxonomically informative to its placement.
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