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.[1] They were formerly classified in the family Rhinobatidae but are now recognized as a distinct family, Glaucostegidae.[2]
Their upperparts are uniform pale yellowish, brownish or greyish, and the nose is pale. Most are large, reaching NaNm (-2,147,483,648feet) in length depending on the exact species involved, except for the small G. obtusus that is less than 1m (03feet).[1]
There are ten recognized species, all of which are classified as critically endangered:[2]