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Ragged Tooth Sharks
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).
The rainbow shark, Epalzeorhynchus (Labeo) frenatusis not a real shark - it is a type of algae-eating minnow (a cyprinid) that superficially resembles a shark (and is often confused with the red-finned shark - another non-shark). The rainbow shark can be an aggressive fish and will eat smaller or weaker fish (although it is mostly an algae eater). The rainbow shark is a popular home aquarium fish. It grows up to 6 inches (15 cm) and is native to Thailand and Indochina.
Ratfish (or chimaeras) are cartilaginous fish that have compressed bodies and rodent-like teeth (hence their name). Ratfish are closely related to sharks and rays (in the class Chondrichthyes), but ratfish have bigger heads and eyes, the mouth is more towards the front of the head, the skin is smooth, most species have a whip-like tail, and the four gills have gill covers and are located under the skull. Male ratfish are smaller than the females. Ratfish are also called elephantfish (the family Callorhynchidae) or ghost sharks. Ratfish evolved during the Devonian (about 340 million years ago). There are three families of ratfish and about 35 species of ratfish alive today; they all live in cold water and are oviparous (they lay eggs on the ocean bottom).
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.
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.
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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