Today, there are six groups of modern chordates—one group of nonvertebrate chordates and five groups of vertebrate chordates (fishes, amphibians, reptiles, birds, and mammals). There are many different kinds of … characteristics of this group namely the notochord (Gr. These range from small fish to giant whales, from playful dogs to ferocious cats. Learn vocabulary, terms, and more with flashcards, games, and other study tools. But chordates do have many amazing species. One is the tunicate, which is an animal that lives in the ocean and looks like a spouting pouch. The notochord is a flexible rod made out of a material similar to cartilage. canal running from one end to the other. (2) Dorsal tubular nerve cord: The nerve cord lies just above the notochord and remains entirely out-side the coelom. structure persists throughout life. The number of chordate species is limited. Jaws 2. Chordate Diversity • Chordate Diversity •Living chordates are diverse: –nonvertebrate chordates, which include tunicates and lancelets –vertebrates, which include … Figure 1: Chordates. The three distinctive characteristics of the chordates are the About 49,000 It is made up of separate bony elements or vertebrae. Subphylum Urochordata (Tunicata) The urochordates (“tail-chordates”), more commonly called tunicates, include about 3000 species. Have 4 common features present in embryonic or … c) Spinal cord. Diversity of vertebrates: animals with backbones: The subphylum Vertebrata contains all animals that possess backbones, gills, and a central nervous system in at least one phase of development. These six species illustrate the diversity of the phylum Chordata. Nearly Students gain a critical understanding of the systematics (taxonomy and phylogeny) and diversity of recent chordates and some key fossil groups, and a thorough knowledge of the morphological, ecological and evolutionary adaptations in the various groups. Animal Diversity – II (Phylum Chordata) Very Short Answer Questions: 1. back + L. chorda, cord). Hence, two major groups exist, namely: Chordates and Non-chordates. It is located between the digestive tube and the nerve cord, and … SAMPLE ANSWER: Primates evolved later than other animals. In book: A Text Book of Zoology B.Sc.II Life and Diversity of Chordata and Concept of Evolutionna (pp.177-209) Chapter: Adaptive Radiation,Evolution of Man and Animal Adaptation invertebrates' since they have neither notochord nor backbone in their body. Paired Fins GNATHOSTOMES AMNIOTES TETRAPODS CRANIATES Divergence of Cephalochordates and Vertebrates 1. in weight is the biggest known animal. About 49,000 species are on record which are only half of the living species of molluscs and less than one tenth of arthropods. (1) Notochord: During the embryonic development of a chordate there appears a sup-porting rod called the notochord. 7. The gigantic, The three distinctive characteristics of the chordates are the They have adapted themselves to more modes b) Vertebrates only. By Andrea Anderson. Diversity of Chordates . In cyclostomes, there is a muscular, fleshy, rasping tongue with horny teeth for rasping the skin and muscles of their prey. 2.5-Characteristics of Petromyzon, Myxin. presence of, During the embryonic development of a chordate there appears a a defining characteristic of all chordate embryos; consists of a flexible rod that lies between the digestive tract and the nerve cord. They also have a segmented body with a coelom and bilateral symmetry. In amphibians, like frogs and toads it is found only in the larval In chordates, the food laden blood from the digestive tract About 49,000 species are on record which are only half of the living species of molluscs, and less than one-tenth those of arthropods. The chordates are named for the notochord, which is a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and in the adult stage of some chordate species. d) Vertebral column. Animal Diversity (Non-Chordata) THE NON-CHORDATES. Contrary to popular belief, chordates do not exclusively include vertebrates. amphibians. This chapter provides a very broad and generalized overview of the diversity and evolutionary history of Chordata, which originated during the Cambrian period alongside most of the other animal phyla. It is surrounded by fibrous and elastic sheath. In others it is partially or completely Chordates also include a great variety of bizarre lineages of fish-like forms that went extinct early in the history of the phylum. In higher vertebrates (reptiles, birds and mammals) they are embryonic to occupy various kinds of habitats. The chordates exhibit an astonishing diversity of form, physiology and habit. Origin of Chordata: 2.1-Origin of chordates-Dipleurula concept & Echinoderm theory. © copyright 2020 QS Study. The chordates are named for the notochord, which is a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and in the adult stage of some chordate species. Class notes on inverterbrate Diversity focusing on Echinoderms and Introducing the Phylum Chordata The animals belonging to all other phyla of the Animal Kingdom are often termed 'the non -chordates' or 'the invertebrates' since they have neither notochord nor backbone in their body. connective tissue sheath. However, in addition to the subphylum Vertebrata, the phylum Chordata also contains two subphylums of invertebrates: Urochordata and Cephalochordata. Standing Diversity of Marine Chordates. They are found in the sea, in freshwater, in the air and on all parts of land from the poles to the equator. Chordata is defined as the most recent common ancestor of tunicates and cephalochordates, and all of that ancestor's descendants. Despite their modest number of species, the The gigantic blue whale which is 35 meters long and 120 tons bi­lat­eral sym­me­try. characteristics of this group namely the, The chordates exhibit an astonishing diversity in form, (BS) Developed by Therithal info, Chennai. Chordates have three embryonic cell layers. b) Notochord. This book will take you on a journey to discover the origin and diversification of the head, which evolved from a … exte-rior. of primary interest because human beings are members of this group. Explore more: Kingdom Animalia c) … sup-porting rod called the, First three sub phyla are collectively known as, Phylum : Protozoa, Porifera and Coelenterata or Cnidaria, Sub phylum : Vertebrata (Craniata) and Classification of Vertebrata - Class : Pisces and Tetrapoda, Class : Amniota - Reptilia - sub phylum - Tetrapoda, Class : Mammalia - Reptilia - sub phylum : Tetrapoda, Monotremata, Marsupialia and Placentalia -Classification of Class : Mammalia - Reptilia - sub phylum - Tetrapoda. a) Cranium. Chordates have a complete digestive system and … Copyright © 2018-2021 BrainKart.com; All Rights Reserved. Diversity of Chordates . noton, in the liver again as capillaries constitute the hepatic portal system. Chordate Diversity History. Terrestrial Locomotion 4. Post anal Tail. The urochordates (“tail-chordates”), more commonly called tunicates, … Some classifications also include the phylum Hemichordata with the chordates. 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