eguruchela

The phylum : Chordata

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    • Animals of this phylum are fundamentally characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. These are bilaterally symmetrical, triploblastic, coelomate with organ-system level of organisation. They possess a post anal tail and a closed circulatory system.

    Organization Level : Organ- system

    Symmetry : Bilateral

    Coelom : Coelomate

    Respiratory system : Present

    Digestive system : Complete

    Circulatory System : Present

    Chordata

    Chordata

    Features of chordates and non-chordates

    featuresChordates Non-chordates
    NotochordPresent Absent.
    Central nervous system Dorsal, hollow and single. Ventral, solid and double.
    Gill slitsPharynx perforated by gill slits. Gill slits are absent.
    Heart Ventral. dorsal (if present).
    A post-anal part (tail)Present.Absent.

    Phylum Chordata is divided into three sub-phyla:

    1. Urochordata or Tunicata,

    2. Cephalochordata and

    3. Vertebrata.

    The subphylum Vertebrata is further subdivided as follows:

    Division Super Class Class Examples
    Vertebrata Agnatha (Lacks jaw) 1.Cyclostomata Petromyzon (Lamprey) and Myxine (Hagfish).
    Gnathostomata (Bears jaw) Pisces (bear fins) 1.Chondrichthyes Scoliodon (Dog fish), Pristis (Saw fish), Carcharodon (Great white shark), Trygon (Sting ray)
    2.Osteichthyes

    Marine: Exocoetus (Flying fish), Hippocampus (Sea horse)

    Freshwater: Labeo (Rohu), Catla (Katla), Clarias (Magur)

    Aquarium: Betta (Fighting fish), Pterophyllum (Angel fish)
    Tetrapoda (bear limbs) 1. Amphibia Bufo (Toad), Rana (Frog), Hyla (Tree frog), Salamandra (Salamander), Ichthyophis (Limbless amphibia).
    2. Reptilia

    Chelone (Turtle), Testudo (Tortoise), Chameleon (Tree lizard), Calotes (Garden lizard), Crocodilus (Crocodile), Alligator (Alligator). Hemidactylus (Wall lizard),

    Poisonous snakes : Naja (Cobra), Bangarus (Krait), Vipera (Viper)
    3. Aves Corvus (Crow), Columba (Pigeon), Psittacula (Parrot), Struthio (Ostrich), Pavo (Peacock), Aptenodytes (Penguin), Neophron (Vulture)
    4. Mammalia

    Oviparous: Ornithorhynchus (Platypus)

    Viviparous: Macropus (Kangaroo), Pteropus (Flying fox), Camelus (Camel), Macaca (Monkey), Rattus (Rat), Canis (Dog), Felis (Cat), Elephas (Elephant), Equus (Horse), Delphinus (Common dolphin), Balaenoptera (Blue whale), Panthera tigris (Tiger), Panthera leo (Lion)