Stocky and dark brown in color, the Portuguese dogfish can be distinguished from similar-looking species (such as the kitefin shark, Dalatias licha) by the small spines in front of its dorsal fins. Its dermal denticles are also unusual, resembling the scales of a bony fish.
The Portuguese dogfish is characterized by its stocky build and dark brown coloration. It can be distinguished from similar species like the kitefin shark (Dalatias licha) by the presence of small spines on its dorsal fins. Its dermal denticles, which resemble the scales of a bony fish, are also unique.