The deepwater sculpin "Myoxocephalus thompsonii" of continental North American freshwater lakes (e.g., the Great Lakes) is closely related to the fourhorn sculpin and alternatively considered as a subspecies of the latter, "Myoxocephalus quadricornis thompsonii".
The deepwater sculpin "Myoxocephalus thompsonii" of continental North American freshwater lakes (e.g., the Great Lakes) is closely related to the fourhorn sculpin and alternatively considered as a subspecies of the latter, "Myoxocephalus quadricornis thompsonii".