They were formerly classified in the family Rhinobatidae.
2.
They were formerly classified in the family Rhinobatidae but are now recognized as a distinct family, "'Glaucostegidae " '.
3.
Other elasmobranch groups prominently represented include Carcharhinidae, Dasyatidae, Gymnuridae, Myliobatidae, Rajidae, Rhinobatidae, Scyliorhinidae, Sphyrnidae, Squatinidae, Torpedinidae and Triakidae.
4.
This finding affirmed that the thornback guitarfish is not closely related to the true guitarfishes of the family Rhinobatidae, a possibility that had long been considered by taxonomists.
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