class: condrichthyes sharks, rays, skates, and chimaeras michael slonkosky kyle moran matt gregory
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The Cartilaginous FishClass: Condrichthyes
Sharks, Rays, Skates, and Chimaeras
Michael SlonkoskyKyle MoranMatt Gregory
Cartilaginous Characteristics
-Jawed Fish-Paired Fins-Paired nostrils-Two Chambered Heart-Cartilage Skeleton
External Anatomy of Shark
External Anatomy of Ray
Placoid Scales
-Tough Skin Covering-Dermal Teeth/Denticles-Continue towards mouth -Specialized Version: Teeth
Reproductive System
Skate or Ray?
Differences-Reproductive strategies.
- Rays: live bearing (viviparous) - Skates are egg laying (oviparous)
-Appearance- Skates have a prominent dorsal fin - The dorsal fin is absent or reduced in rays - Most rays are kite-shaped with whip-like tails containing barb - skates have fleshier tails and lack spines. - rays are generally much larger than skates. - Skates have small teeth - Rays have plate-like teeth for crushing prey.
-ProtectionRays : stinging spines or barbs skates : thorny projections on their backs and tails
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