Falcate, scythe-shaped; a flat body curved, its edges parallel.
Wings rather short, falcate, pointed, the second primary longest.
There is a falcate dorsal fin; but the head in outline is not Rorqual-like in spite of its similar proportions.
Setae numerous; the appendage short, falcate, with tip simple, but a slender tooth near middle of curved edge.
Prickles straightish ...