Raja dipterygia Bloch & Schneider, 1801 The numbray or spottail sleeper ray (Narke dipterygia) is a species of electric ray in the family Narkidae.

It is a weak swimmer that lies on the bottom, commonly buried.

[2] It has been observed that Numbrays are not as common as other types of rays in the area around the Indian Ocean.

This can be attributed to the relatively large doubling time for a population, reaching up to 18 years.

First record of the numbray, Narke dipterygia (Bloch & Schneider, 1801) from Iran (Elasmobranchii: Narkidae).