21.02.2014 Views

DEEP–SEA CARTILAGINOUS FISHES OF THE INDIAN OCEAN

tM1l9

tM1l9

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

ody flattened,<br />

raylike<br />

mouth terminal,<br />

pectoral fins not<br />

attached to head<br />

SQUATINIFORMES<br />

5 or 6 gill<br />

slits; no anal<br />

fin<br />

body not<br />

raylike<br />

snout elongated,<br />

sawlike<br />

PRISTIOPHORIFORMES<br />

SHARKS<br />

snout short, not<br />

sawlike<br />

SQUALIFORMES<br />

6 or 7 gill slits,<br />

1 dorsal fin<br />

HEXANCHIFORMES<br />

nictitating eyelids,<br />

spiral or scroll<br />

intestinal valve<br />

5 to 7 gill<br />

slits; anal fin<br />

present<br />

mouth behind<br />

front of eyes<br />

CARCHARHINIFORMES<br />

no dorsal fin<br />

spines<br />

no nictitating<br />

eyelids, ring<br />

intestinal valve<br />

LAMNIFORMES<br />

PICTORIAL KEY <strong>OF</strong> <strong>DEEP–SEA</strong><br />

SHARK ORDERS OCCURRING IN<br />

<strong>THE</strong> <strong>INDIAN</strong> <strong>OCEAN</strong><br />

(not a cladogram)<br />

5 gill slits<br />

2 dorsal fins<br />

dorsal fin<br />

spines<br />

mouth well in<br />

front of eyes<br />

ORECTOLOBIFORMES<br />

HETERODONTIFORMES<br />

Fig. 23 Higher classification of Sharks (Orders)

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!