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Phylum Chordata Phylum: Chordata. 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal.

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Presentation on theme: "Phylum Chordata Phylum: Chordata. 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal."— Presentation transcript:

1 Phylum Chordata Phylum: Chordata

2 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal side of an organism 2 3 4

3 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal side of an organism 2 Dorsal Tubular nerve cord. Nerves arranged as a pipe filled with fliud 3 4

4 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal side of an organism 2 Dorsal Tubular nerve cord. Nerves arranged as a pipe filled with fliud 3 Pharyngeal gill pouches (develop into gills in fish and amphibians and various other parts in reptiles to mammals (eg. Inner ear)) 4

5 4 Characteristics of Chordates Defining Characteristics 1 Notochord. Found under the nerve chord. Runs down the dorsal side of an organism 2 Dorsal Tubular nerve cord. Nerves arranged as a pipe filled with fliud 3 Pharyngeal gill pouches (develop into gills in fish and amphibians and various other parts in reptiles to mammals (eg. Inner ear)) 4 Muscular Postanal Tail (post = after anal = anus)

6 Subphylums of Chordata SubphylumCharacteristics Urochordata Larvae: Has all 4 characteristics of chordates Adult: Sessile, Lacks chordate characteristics with the exception of the pharyngeal pouches Cephalochordata Vertebrata

7 Subphylums of Chordata SubphylumCharacteristics Urochordata Larvae: Has all 4 characteristics of chordates Adult: Sessile, Lacks chordate characteristics with the exception of the pharyngeal pouches Cephalochordata Aquatic organisms containing all 4 characteristics of chordates as an adult Vertebrata

8 Subphylums of Chordata SubphylumCharacteristics Urochordata Larvae: Has all 4 characteristics of chordates Adult: Sessile, Lacks chordate characteristics with the exception of the pharyngeal pouches Cephalochordata Aquatic organisms containing all 4 characteristics of chordates as an adult Vertebrata Contain all 4 characteristics of chordates. The notochord, however, is replaced by vertebral column

9 Trends in Evolution of Chordates

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16 Subphylum Vertebrata Class Osteicthyes: Most diverse class of vertebrate Fins Uses: Balance and Movement Two types of fins

17 Subphylum Vertebrata Class Osteicthyes: Most diverse class of vertebrate Fins Uses: Balance and Movement Two types of fins 1)Ray-finned fishes: Thin fins supported by rigid ray structures 2) Lobe-finned fishes: fins are made of fleshy appendages. Later evolved into legs.

18 Characteristics of Ray-Finned Fish 1)Bony Skeleton and scales 2)Swim bladder (Air sac allows fish to hover in the water column) 3)2 chambered heart

19 Characteristics of Ray-Finned Fish 1)Bony Skeleton and scales 2)Swim bladder (Air sac allows fish to hover in the water column) 3)2 chambered heart 4)Paired fins 5)Jaws 6)Gills

20 Class: Amphibia Amphibian: Live in land and water (Larval stage is aquatic, Adult stage is terrestrial) Common Examples: Frogs, Toads, Newts, Salamanders, Caecilians, Major Evolutionary Change:

21 Class: Amphibia Amphibian: Live in land and water (Larval stage is aquatic, Adult stage is terrestrial) Common Examples: Frogs, Toads, Newts, Salamanders, Caecilians, Major Evolutionary Change: Jointed Limbs that allowed the move to land

22 Characteristics of Amphibians 1)Tetrapods (four legs) 2)Undergo metamorphosis 3)Three chambered heart 4)Lungs in adults 5)Smooth moist skin (Capable of gas exchange)

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