Chondricthyes - examples
Chimaeras
(chondro = cartilage,
ichthyes = fish)
Ichthyology = study of fish
Skeleton – cartilage
Chondricthyes - examples
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saw fish
Sting rays
DorsoDorso-ventrally flattened body
Large, wingwing-like pectoral fins
Gill openings on ventral side of head
Habitat – shallow water
Manta Ray
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Giant Manta Ray
Skate Rays
Placoid Scales
1. Placoid (dermal)
scales,
scales, embedded in
skin, feel like sandsandpaper
2. No gill covers
3. No swim bladder –
swim or sink
4. Fusiform body –
streamlined
great for
swimming
5. Heterocercal tail
a. large upper lobe
of tail
b. spine extends into
tail
for great thrust to
swim
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Shark facts
Teeth:triangular
– up to 3,000
– in rows
– ready to pop
up if lost
Shark Senses:
• Smell –
very acute
can smell one drop of blood
from 1,000 feet away
(1 part per 10 billion parts of
water)
Shark Senses:
• Vibration –
use lateral line
• Electrical fields –
use ampullae of Lorenzini on
snout & around eyes
Whale shark, largest fish in the
ocean
Shark Senses:
Sight
• very good,
• range = 70 – 100 feet
• color vision
• many cone cells in their
retinas
Whale shark
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Whale shark
Whale shark
Nurse Shark
Nurse Shark
Basking Shark
Great White Shark
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Great White Shark
Bull Shark
Bull Shark aka Zambesi Shark
Hammerhead Sharks
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Black-tipped Reef Shark
Alarming situation
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