Rough sharks are named for their atypically large dermal denticles.

Rough sharks have triangular cross sections.

Sailfin rough sharks live in the northeast and eastern central Atlantic. They are found along the slope of Scotland and Mid-Atlantic ridge, and from Morocco to the Gulf of Guinea.

Angular roughsharks can be distinguished from their close relative by ridges over their eyes that expand into large, rounded knobs, which are covered with enlarged denticles.

The Caribbean roughshark was described in 1961 yet was only lately observed in its natural environment.

The shape of the spiracles (relatively small and almost circular) is a distinguishing characteristic of the sailfin roughshark from other roughsharks.

The angular roughshark typically moves by gliding along the seabed, pausing frequently to hover over the sandy or muddy surface.

The angular rough shark has a broad, flattened head, a short, blunt nose, and two tall, sail-like dorsal fins.

The sailfin roughshark is found in the Eastern Atlantic at depths of 265-800 m (869-2625 ft).

The sharpnose sevengill is widely distributed in tropical and temperate regions of all oceans except the northeastern Pacific.