What is the reported range for the number of venomous spines located near the base of the ray's tail?

Answer

Between one and six spines.

A defining characteristic is the presence of venomous spines situated near the tail base, just behind the pelvic fins, reported to number between one and six.

What is the reported range for the number of venomous spines located near the base of the ray's tail?
animalRayeaglefish