 The pectoral fin disc of the plain maskray is thin and diamond @-@ shaped with narrowly rounded outer corners , measuring 1 @.@ 1 – 1 @.@ 3 times longer than wide . The leading margins of the disc are gently concave and converge at a broad angle to the pointed tip of the snout . The small eyes are placed close together , and behind them are the spiracles . The nostrils are elongated and have a skirt @-@ shaped flap of skin between them . The small mouth bears prominent furrows at the corners and contains two slender papillae on the floor . Small papillae are also found around the outside of the mouth . There are five pairs of gill slits . The pelvic fins are fairly large and pointed . 
 The pectoral fin disc of the plain maskray <a href='drop_aux' title='1'><mark>is</mark></a>thin and diamond @-@ shaped with narrowly rounded outer corners , measuring 1 @.@ 1 – 1 @.@ 3 times longer than wide . The leading margins of the disc <a href='drop_aux' title='2'><mark>are</mark></a>gently concave and converge at a broad angle to the pointed tip of the snout . The small eyes are placed close together , and behind them are the spiracles . The nostrils are elongated and have a skirt @-@ shaped flap of skin between them . The small mouth <a href='uninflect' title='3'><mark>bears</mark></a> prominent furrows at the corners and <a href='uninflect' title='4'><mark>contains</mark></a> two slender papillae on the floor . Small papillae are also found around the outside of the mouth . <a href='dey_it' title='5'><mark>There</mark></a> are five pairs of gill slits . The pelvic fins <a href='drop_aux' title='6'><mark>are</mark></a>fairly large and pointed . 
The pectoral fin disc of the plain maskray thin and diamond @-@ shaped with narrowly rounded outer corners , measuring 1 @.@ 1 – 1 @.@ 3 times longer than wide . da leading margins of tdadisc gently concave and converge at a broad angle to thdaointed tip of the snout . The small eyes r placed close together , and behind em are the spiracles . The nostrils arrlongated and have a skirt @-@ shaped flap of skin between them Thedaall mouth bear prominent furrows at the corners and contain two slender papillae on the daor . Small papillae are also found around the odaide of the moda . It is five pairs of gill slits . The pelvic fins fairly bigass and pointed .