Whaler Sharks - seafdec.org.my

30 S h a r k s a n d R a y s o f B o r n e o
....... Family Heterodontidae, Hornsharks
fig. 50; 44
Dorsal-fin spines absent; no crest over
eye ................................................... 23
23. Whole mouth forward of front margin
of eye (fig. 51) ................................... 24
Mouth partly beneath or behind front
margin of eye (fig. 52) ....................... 28
fig. 51
fig. 52
24. Mouth very broad, terminal; caudal fin
forked (fig. 53) .......................................
... Family Rhincodontidae, Whale Sharks
fig. 53; 60
Mouth smaller, subterminal; caudal fin
not forked ...................................... 25
fig. 53
25. No fleshy lobe or groove on outer
margin of nostril (fig. 54) .................. 26
Fleshy lobe and groove present on outer
margin of nostril (fig. 55) ................ 27
26. Caudal fin very long, about equal to
trunk length (fig. 56); ridges present along
sides of body (fig. 56) ...........................
... Family Stegostomatidae, Zebra Sharks
fig. 56; 58
Caudal fin shorter, less than half trunk
length (fig. 57); no ridges on body
(fig. 57) ..... Family Ginglymostomatidae,
Nurse Sharks
fig. 57; 56
fig. 57
fig. 54 fig. 55
fig. 56
27. Head and body strongly depressed
(fig. 58); skin flaps present on sides of
head (fig. 58) .........................................
....... Family Orectolobidae, Wobbegongs
fig. 58; 46
Head and body cylindrical (fig. 59); no
skin flaps on sides of head (fig. 59) ........
fig. 59
fig. 58