Please enable JavaScript.

Coggle requires JavaScript to display documents.

Classification (Dichotomous keys (Dichotomy is a division into two; a…

- - - - Therefore the features used in the description should be reliabpe and easily visible.
  - - - Fore and hind limbs visible, can emerge on land-2
        Only fore limbs visible, cannot live on land-6
      - Fore and hind limbs have paws-3
        Fore and hind have flippers-4
      - Fur is dark-sea otters
        Fur is white-polar bears
      - External ear flap visible-sea lions and fur seals
        No external ear flap-5
      - Two long tusks-warluses
        No tusks-true selas
      - Mouth breathing, no blowhole-dugons and manatees
        Breathing through blowholes-7
      - Two blow holes, no teeth-baleen whales
        One blowhole, teeth-dolphins, porpoises and whales
- - - - Genus
        
        Canis
      - Species
        
        lupus
      - Family
        
        Canidae
      - Order
        
        Carnivora
      - Class
        
        Mammalia
      - Phylum
        
        Chordata
      - Kingdom
        
        Animalia
    - - Class
        
        Monocotyledoneae
      - Order
        
        Palmales
      - Phylum
        
        Angiospermophyta
      - Family
        
        Arecaceae
      - Kingdom
        
        Plantae
      - Genus
        
        Pheonix
      - Species
        
        dactylifera
    - - Order
        
        Pezizales
      - Family
        
        Tuberaceae
      - Class
        
        Pezizomycetus
      - Genus
        
        Tuber
      - Phylum
        
        Ascomycota
      - Species
        
        melanosporum
      - Kingdom
        
        Fungi
  - - - Paleo-suchus
        
        Trigonatus
        
        Palpebrosus
      - Melano-suchus
        
        Niger
      - Caiman
        
        Yacare
        
        Latirostris
        
        Crocodilus
      - Aligator
        
        Sinensis
        
        Mississippienisis
- - - - Embryo develops inside a seed
        
        Embryos develop into conifers with roots, stems ad leaves
        
        Male and female cones develop
        
        Egg cells develop in ovules on surface of scales in female cones. Pollen develops in anthers in male cones
        
        Male gametes transferred from male to female cones in pollen grains
        
        Zygote fromed by fusion of male and female gametes
    - - Embryo develops into a fern plant with stems, leaves and roots
        
        Fern produces spores inside asponrangia
        
        Spores germinate and grow into tiny thin green plants
        
        Male and female gametes produced by prothalli (thin green plants)
        
        Male gamete swims to female gamete in another prothallus
        
        Zygote formed by fusion of male and female gametes. Embryo initially fed by prothallus
    - - Embryo develops into a sporophyte attached to a bryophyte plant
        
        Sporophyte produces spores inside a sporangium
        
        spores develop into bryophyte plant-no roots, but soe bryophytes have simple stems and leaves
        
        Male and female gametes produced by bryophyte plant
        
        Male gamete swims to female gamete
        
        Zygote formed by fusion of male and female gametes. Embryo fed by bryophyte
    - - Embryo develops inside a seed
        
        Embryos develop into flowering plants with roots, stems and leaves
        
        Flowers develop with ovaries and anthers
        
        Egg cells develop in ovules enclosed inside ovary. Pollen develops in anthers
        
        Male gametes transferred from flower in pollen grains
        
        Zygote formed by fusion of male and female gametes
- - - - Examples of different phyla
        
        Cnidaria (hydras, jellyfish, corals)
        
        Only mouth
        
        Symmetry: radial
        
        Soft, but hard corals secrete CaCO3
        
        Tentacles arranged in rings around the mouth, with stinging cells
        
        Mollusca (bivalves, gastropds, snails)
        
        Mouth and anus
        
        Symmetry: bilateral
        
        Soft, most have shell made CaCO3
        
        A fold in the body wall called the mantle secretes the shell.
        
        Porifera (fan sponges, tube sponges, cup sponges)
        
        No mouth or anus
        
        Symmetry: none
        
        Internal spicules
        
        Many pores over the surface through which water is drawn in for filter feeding.