snout lengr than the width of the mouth
family sphyrnidao
key to species
1a eyes and nostrils widely separate oculonarial expansion widedepth to width 1:2.5
1b eyea and nostrils close together oculonarial expansion short depth to width =1:1
order squaliformes
only one family one species found
family squalidae
squalus mitsukurii
order rajiformes
key to families
1a disc narrow elongate taii with two dorsals and well developed caudal
1b disc broad polygonai to rounded tail slender whiplike with or without serrated spines