Whaler Sharks - seafdec.org.my

28 S h a r k s a n d R a y s o f B o r n e o
Mouth terminal, located at end of snout
tip ............................................... Manta
fig. 35; 256
Mouth subterminal, located on undersurface
of head .......................... Mobula
fig. 36; 258
fig. 35
No lateral, paddle-like processes on head,
instead with a pair of broadly rounded
lobes (fig. 37) or a single, fleshy subrostral
lobe (fig. 38); teeth large and plate-like,
fewer than 10 rows in each jaw ......... 16
16. Margin of subrostral lobe with a deep
central notch (fig. 37); floor of mouth
without papillae ....................................
... Family Rhinopteridae, Cownose Rays
fig. 37; 252
Margin of subrostral lobe rounded (fig.
38); floor of mouth with fleshy papillae
.......... Family Myliobatidae, Eagle Rays
Posterior margin of internasal flap
deeply notched (inverted V-shape) (fig.
39); teeth in a single row in each jaw
............................................... Aetobatus
fig. 38; 242
Posterior margin of internasal flap almost
straight or only undulating slightly
(fig. 40); teeth in more than one row in
each jaw ............................. Aetomylaeus
fig. 41; 246
17. A single dorsal fin (fig. 42); 6 or 7 gill
openings on each side of head (fig. 42)
............ Family Hexanchidae, Cowsharks
fig. 42; 36
fig. 36
fig. 37
fig. 38
fig. 39 fig. 40
fig. 41
2 dorsal fins; 5 gill openings on each
side of head ..................................... 18
18. Anal fin absent ................................ 19
Anal fin present, sometimes small or
fig. 42