This crab was caught in 1050' of water off the coast of Deerfield beach

Dr. Robert lasley of U of FL. provided the ID and has the specimen
I had some more time to look at the crab you sent. It is Tetraxanthus bidentatus, not Hexapanopeus! The specimen you collected is the only one we have at the Florida Museum, and in previous studies on related crabs, researchers have had difficulty finding recently collected specimens of this species to study. It's an important contribution, so thanks again for sending it in!
Tetraxanthus bidentatus (A. Milne-Edwards, 1880) – cornered mud crab