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Phylum: Chordate Animals

Phylum: Chordate Animals . Ms. Mullins ALS: Animals. Early Chordates. Earliest known vertebrates were fishlike animals. It was believed that they contained a brain enclosed in a skull of bone or cartilage and a notochord that functioned as a supporting structure.

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Phylum: Chordate Animals

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  1. Phylum: Chordate Animals Ms. Mullins ALS: Animals

  2. Early Chordates • Earliest known vertebrates were fishlike animals. • It was believed that they contained a brain enclosed in a skull of bone or cartilage and a notochord that functioned as a supporting structure.

  3. What is needed to be a Chordate? • To be considered a chordate, an animal must possess a notochord, gill slits (seen only in embryonic development in most vertebrates), and a tail (in the embryo stage if not as an adult). • Agricultural species of animals are found in the following three classes with the phylum chordate.

  4. Osteichthyes Class • Contains over 26,000 species of bony fish. • Features: skeleton is made of bone and not cartilage, skin with mucous glands, and a swimbladder. • Examples: salmon, trout, carp, catfish, bass, walleye, and tilapia

  5. Aves Class • Includes birds, characterized by the presence of feathers, scales on the legs, well-developed lungs, hard-shelled eggs, a completely subdivided four-chambered heart, usually wings for flying, and they are endothermic. • Examples: chickens, geese, ostrich, and turkeys

  6. Mammalia Class • Animals have the following characteristics: mammary glands, hair, endothermic, their young develop in the uterus, four-chambered heart, and a enlarged forebrain. • Examples: cattle, sheep, goats, pigs, horses

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