The genera and species of "Bramble sharks"

Bramble sharks represent a very small family consisting of one genus and 2 species. Both possess cylindrical, stout trunks, without ridges on the abdomen. Two spineless dorsal fins are present. Although bramble sharks resemble ancient sharks they possess 5 pairs of gill slits, where the 5th one is expanded in width. Small spiraculi are present. Both species prefer deeper water over the continental shelves and slopes. Their biology is poorly known, however it is generally accepted that they have a sluggish life style. They have a very large pharynx that is thought to suck in their prey by suddenly expanding their mouths. Both species show an ovoviviparous style of reproduction (aplacental viviparity).