Dalatiidae 黑棘鲛科
The Dalatiidae are a family of sharks in the order Squaliformes, commonly known as kitefin sharks (which also refers specifically to the species Dalatias licha). Members of this family are small, under 2 m (6.6 ft) long, and are found worldwide. They have cigar-shaped bodies with narrow heads and rounded snouts. Several species have specialized bioluminescent organs. Though seven species are in this family, five of them are monotypic.