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 Table of Contents |
Enchanted Learning All About Sharks! |
 Geologic Time Chart |
| Introduction to Sharks | Introduction to Rays | Anatomy | Shark and Ray Species | Extreme Sharks | Extinct Sharks | Classification | Shark Glossary | Shark Index | Printables, Worksheets, and Activities |
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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U-Z |
 RADIOISOTOPE DATING Radioisotope dating is used to find out how old fossils are. |
 RAGGED TOOTH SHARK Ragged tooth sharks (Eugomphodus taurus) are also known Sandtigers, the grey nurse shark, the sand shark, and the spotted ragged-tooth shark. They are widespread Mackerel sharks (Lamniformes) that range from gray to brown and are about 10-12 feet (3-3.7 m) long. They are fish-eaters that have long, sharp teeth in a narrow snout. They eat and migrate in groups; their activity peaks at night. They are found mostly near coastlines, from the surface down to depths of 3,900 ft (1,200 m). At birth they are about 3 ft (1 m) long. Classification: Order Lamniformes (Mackerel sharks), Family Odontaspididae (Sandtiger sharks). |
 RAY Rays are fish that have a flat body, a tail, and cartilage instead of bones. Rays evolved from sharks. |
 RAY-FINNED FISH Ray-finned fish (class Actinopterygii) are the largest group of fish. These bony fish evolved during the very end of the Silurian, about 408 million years ago. These fish dominate the seas today. Sharks are not ray-finned fish. |
RED-TAILED SHARK The red-tailed shark, Epalzeorhynchus (Labeo) bicoloris not a real shark - it is a type of minnow (a cyprinid) that superficially resembles a shark (and is often confused with the rainbow shark - another non-shark). The red-tailed shark can be an aggressive fish and will eat smaller or weaker fish (although it is mostly an algae eater). The red-tailed shark is a popular home aquarium fish. It grows up to about 5 inches (13 cm) and is native to Thailand. |
REMORA Remora (family Echeinidae) are small fish that live on and around sharks. They eat stray bits of food left by the shark and tiny shrimp-like parasites that live on the shark's skin. They have sucker-like disks on their heads with which they attach to the shark. Both the shark and the remora benefit from the pairing, but the remore benefits much more; this is commensalism. Remora are also known as sucker fish or shark sucker. |
  REPTILE Reptiles are a group of animals that have scales, breathe air, are cold-blooded, and usually lay egg. Lizards, snakes, turtles and dinosaurs are reptiles. |
 REQUIEM SHARKS Requiem sharks (Family Carcharinidae) are a type of large Carcharhiniformes sharks. with 5 gill slits, two dorsal fins, an anal fin, no fin spines, the mouth behind the eyes, and nictitating eyelids. There are 48 species of carcharinidae including the tiger shark, Dusky shark, Bull shark, Galapagos shark, Sandbar shark, and many others. |
ROSTRUM A rostrum is the beak-like upper jaw of a whale. |
ROUGHSHARKS Roughsharks (Oxynotidae) are a group of small sharks that are mostly bottom-dwellers. They have a stout, laterally-compressed body, no anal fin, and a prominent ridge along the abdomen. Their lower teeth point backwards and the upper teeth are larger in the back of the mouth. The roughsharks include the prickly dogfish (humantin), the Caribbean roughshark, the angular roughshark, and the sailfin roughshark (sharp-back shark). Classification: Order Squaliformes |
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Shark Glossary |
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