angel shark

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several raylike sharks of the genus Squatina, having a flattened body and winglike pectoral and pelvic fins.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A member of the unusual genus Squatina of sharks with flattened bodies and broad pectoral fins resembling skates or rays. There are approximately 16 known species, which are the only members of their taxonomic genus, family and order. They occur worldwide in temperate and tropical seas.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do