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Your shark has an anal fin, 5 gill slits, 2 dorsal fins, no dorsal fin spines, and its mouth is behind its eyes. Does your shark have nictitating eyelids? What kind of intestinal valve does it have? It has nictitating eyelids and a spiral intestinal valve.(back to previous level) Cocos Island | Sharkmasters | World of Sharks | Dispatches E-mail | Resources | Site Map | Sharks Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule | About NOVA Watch NOVAs online | Teachers | Site Map | Shop | Search | To Print PBS Online | NOVA Online | WGBH © | Updated June 2002 |