Blackchin Guitarfish Glaucostegus cemiculus (prev. Rhinobatos cemiculus)

Guitarfish are named after the supposedly guitar-shape of their bodies. They have a ray's front end with wings and a shark's back end with dorsal fins and tail. The Blackchin Guitarfish, also Black-chinned, is native to sandy coasts and reefs of the warm eastern Atlantic including the Mediterranean.

It looks much like the Common Guitarfish from the topside but has a black chin on the white underside. However, it can grow to some 2 metres long and has been moved to the Giant Guitarfish genus of Glaucostegus. Another relative, the Giant Shovelnose Ray (confusingly also called Giant Guitarfish), Glaucostegus typus, has been moved to that genus and also has a black chin.

It is critically endangered and no longer present in parts of its recent former range.

Threats include by-catch from boats trawling the seabed for shrimp or squid and intentional fishing for the shark fin trade. The slow-maturing, low-fecundity fish are particularly vulnerable seasonally when gathering together in coastal waters to breed.