The below mentioned article provides biology notes on Class Osteichthyes. 1. The endoskeleton is cartilaginous in the embryonic stage, but in the adult forms more or less it is replaced by bones. Thus they have bony endoskeleton. They are ectothermic (cold blooded). There are about 25,000 species of bony fishes. 2. Caudal fin usually homocercal […]
Class Osteichthyes (With Diagram) | Bony Fishes
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Class Chondrichtyes (With Diagram) | Cartilaginous Fishes
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The below mentioned article provides short notes on Class Chondrichtyes. 1. The fishes of this class bear cartilaginous endoskeleton. They are cold blooded (poikilothermous or ectothermic). There are about 600 species of cartilaginous fishes. 2. The skin is tough, containing minute placoid scales, which are dermal in origin. 3. Except in the Chimaeras, the gills […]
New World Monkeys and Old World Monkeys | Animal Kingdom
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The upcoming discussion will update you about the difference between New World Monkeys and Old World Monkeys. Difference # New World Monkeys: 1. Found in central and South America. 2. Cheek pouches absent. 3. Nose flat. The nostrils are set wide apart. 4. Ischial callosities are absent. 5. Tail is prehensile and is used to […]
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