Oxynotus centrina (Linneaus 1758; up to 1.5m) is the extant angular roughshark. Ridges appear over the eyes and between the pectoral and pelvic fins. The anal fin is absent, as in all clade members. A dorsal spine is present on both dorsals. These chimaera-like sharks feed on small bottom-dwelling prey, like worms, crustaceans and molluscs. The nares are enormous.

Isistius brasiliensis (Quoy and Gaimard 1824) is the extant cookiecutter shark, a living sister to Falcatus. This deep-water shark has light-emiting photophores covering its underside. It migrates to the surface every day to take a circular bite out of giant whales and sharks. In this way it can be seen as a sort of lamprey-mimic. Isistius also consumes smaller free-swimming prey, like squid. Note the anterior nostrils and larger dentary teeth.

Dalatias licha (Bonnaterre 1788, Rafinesqu 1810; 1 to 1.8m) is the extant kitefin shark. This slow-moving sea floor skimmer is the largest luminious vertebrate. Here this solitary predator nests with the cookie cutter shark, Isistius (above). The jaws do not extend to produce suction. The gill openings extend both above and below the pectoral fin.