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EX B4 ANSWERS – DICHOTOMOUS KEY
SHARKS GALORE !
1. shape of body / number of gill slits / position of mouth / shape of caudal fins / length or number of dorsal fins / presence or absence of pelvic fins / anal fins / shape of head
2. (a) Shark 4 – Fin asymmetrical in shape
Shark 7 – Top half of caudal fin same shape & size as bottom half (symmetrical)
(b) Shark 4 – Presence of anal fin
Shark 8 – Absence of anal fin
(c) Shark 5 – has 5 gill slits
Shark 12 – has 6 gill slits
Identification of Sharks
1. Family Rajidae
2. Alopiidae
3. Pristiophoridae
4. Carcharhinidae
5. Scyliorhinidae
6. Rhincodontidae
7. Isuridae
8. Squalidae
9. Dasyatidae
10. Mitsukurinidae
11. Pseudotriakidae
12. Hexanchidae
13. Sphyrnidae
14. Mobulidae
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