The rhombic disc and sparse white spots on the lateral margins of the tail immediately anterior to, adjacent to, and immediately posterior to the spine. The tail of immatures of M. arabica less than 33 cm in disc width (DW) to bear conspicuous white bands on the upper half of the tail behind the caudal sting, the tail of the specimen had inconspicuous white spots that were restricted to the region of the tail anterior and posterior to the tail spine.