Even now, the vast oceans hold many secrets. The Harlequin Catshark (Ctenacis fehlmanni) is a really poorly-known species of finback catsharks (Proscyllidae or false catsharks). Only few specimen have been found, the first (holotype) around 1960 off Somalia.

Ctenacis fehlmanni distmap.png
distribution map of Ctenacis fehlmanni By Chris_huh – Compagno, Leonard; Dando, Marc & Fowler, Sarah (2005). Sharks of the World. Collins Field Guides. ISBN 0-00-713610-2., CC BY-SA 3.0, Link

The only 18 in -46 cm- long female shark held one thin-walled, large egg-case in each uterus, but experts don’t agree upon if this species is ovoviviparous (that means the young hatch out of these egg cases inside their mother and are born alive) or oviparous (lay egg cases). The family Proscyllidae consists of species with both modes of reproduction.

Since no deep-sea trawling fisheries take place off Somalia, this deep-sea species is considered “Least concern”.

Sources: herehere and here