Post on 16-Jan-2016
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RemindersTurn in HOURS HOURS are due TODAYInsect test retakes this week only!
Grade worksheets in a few minutesNext week is Shark week, this week is an introduction to all chordates/vertebrates.
The Vertebrate Animals
All Vertebrates are ChordatesPhylum chordata!
Chordates ALL have 4 characteristics sometime during their lives
a notochord
nerve cord
gill slits
a tail
The non-vertebrate chordates - Tunicates
Amphioxus
About the Amphioxus song
99% of chordates are vertebrates - Characteristics of Vertebrates
Bilateral Symmetry with 2 pairs of appendages,
cephalization (sense organs concentrated in a head region)
True body cavity
closed circulatory system.
Endoskeleton including a vertebral column
Well developed body systems.
CartilageBonyAmphibianReptileBirdMammal
Comparative Numbers of Species
Classes of Vertebrates
Jawless fish
Cartilaginous Fishes
Bony Fish
Amphibians
Reptiles
Birds
Mammals
Jawless Fish
Primitive, no paired fins
no bone, all cartilage
Lamprey – a parasite
Hagfish – scavenger, also called slime eel.
Jawless Fish
Cartilage Fish
Sharks, skates, rays
750 species
Ventral mouth
Spiral valve increases surface area
Massive liver (up to half body weight)
skin with tooth-like scales
Cartilage Fish
Bony Fish
20-30,000 species
Appeared 400 million years ago
Cold blooded, flat scales, swim bladder
gills and gill cover
Most lay eggs
eyes usually on the side of the head
Bony Fish
Amphibians
2000 species, appeared 350 million years ago.
Cold-blooded, moist skin, lungs, no claws
Lay jellylike eggs
Life cycle includes a larval stage
90% are frogs and toads
Amphibians
Reptiles
6500 species, appeared 300 million years ago.
Cold-blooded, hard shelled eggs, internal fertilization
Body covered with scales.
Include crocodilians, lizards and snakes, turtles and the tuatara
Reptiles
Birds
8600 species, appeared 130 million years ago.
Warm blooded, 4 chambered heart
Feathered dinosaurs
Feathers, crop, oil glands, hollow bones, fused skeleton---all adaptations for flight.
Birds
Mammals
First appeared 180 million years ago
4500 species, most are placental.
2 primitive orders; monotremes and marsupials
Diaphragm, hair, mammary glands, lips, different kinds of teeth, external ears.
Mammals
Vert./Chordate Quiz Tuesday!!!
For more information 7 Vertebrate Classes.docOn WBP and Shared drive
The Vertebrate Animals