 The plain maskray or brown stingray ( Neotrygon annotata ) is a species of stingray in the family Dasyatidae . It is found in shallow , soft @-@ bottomed habitats off northern Australia . Reaching 24 cm ( 9 @.@ 4 in ) in width , this species has a diamond @-@ shaped , grayish green pectoral fin disc . Its short , whiplike tail has a black , yellow-edged tip . This stingray is ovoviviparous , with the embryos and eggsos in a yolk sac rather than a urochordata . The plain maskray is a relatively common species that is caught commercially for its meat and