Glaucostegus

Glaucostegus, also known as giant guitarfishes, is a genus of large Indo-Pacific rays, with a single species, Glaucostegus cemiculus, in the East Atlantic, and Mediterranean. They were formerly classified in the family Rhinobatidae but are now recognized as a distinct family, Glaucostegidae.

Their upperparts are uniform pale yellowish, brownish or greyish, and the nose is pale. Most are large, reaching in length depending on the exact species involved, except for the small G. obtusus that is less than .