The Izak catshark has a short, wide, flattened head and a robust body tapering to a long, slender tail.

Bottom-dwelling and perhaps relatively active in nature, the Izak catshark feeds mainly on a diverse array of bony fishes, crustaceans, and cephalopods.

The Izak catshark is regularly caught incidentally by a South African bottom trawl commercial fishery, but is discarded rather than utilized.

He assigned the new species to the genus Scylliorhinus, and gave it the specific epithet regani in honor of fellow ichthyologist Charles Tate Regan.

[4] As there do not appear to be any existing type specimens referable to Gilchrist's account, in 2006 Brett Human designated a 63 cm (25 in) long male caught in Hondeklip Bay as the species neotype.

The horizontally oval eyes are placed high on the head and have thick ridges beneath; each has a rudimentary nictitating membrane and is followed by a spiracle.

The free rear tips of the pelvic fins may be fused together to some degree, but never completely; males have slender, pointed claspers.

The underside is plain white, with obvious black sensory pores beneath the head, body, and paired fins.

At least some part of its recorded diet probably represents scavenging from fishery discards, given the presence of fast-moving, pelagic species that the shark is unlikely to have captured live.

The capsule is light brown with long tendrils at the four corners that likely serve to anchor it to rocks; its surface has a velvet-like texture and bears lengthwise striations.

[4][6] It is regularly caught incidentally (and discarded) by a bottom trawl fishery targeting hake south of Cape Town.

[5] The International Union for Conservation of Nature (IUCN) has consequently listed the Izak catshark under Least Concern, while still noting that it merits continued population monitoring because of its highly restricted range.