Day 16 Intro to Chordata
Watch this short introduction to the phyla chordata
Chordata (45,000 Species)
Chordate characteristics
-Bilaterally symmetrical
-Deuterostomates
-At one point in their lives they have each of these 4 things
-Notochord
-Pharyngeal slits
-Dorsal tubular nerve cord
-Postanal tail
-Presence of endostyle or thyroid gland
-Complete digestive tract
-Ventral, contractile blood vessel (heart)
Vertebrates
Three classes of Fish
Class Agnatha
-Hagfish (30 species)
-Lampreys (35 species)
Class Chondrichthyes (Sharks, rays, chimaeras) (1,000 species)
Class Osteichthes
The Boney Fish (27,000 species)
Clade Tetrapods (29,000 species)
Class Amphibians
-Order Caecilians (No legs)
-Order Caudata (Salamanders) (retain their tail as adults)
-Order Anura (Frogs) (lack tails as adults)
-Toads- terrestrial frog
Clade Amniotes (have amniotic eggs)
Class Reptiles
-Order Crocodilians (23 species)
-Order Testudines (Turtles) (307 species)
-Tortoise- terrestrial turtle
-Order Sphenodontida (Tuataras) (2 species)
-Order Squamates (Snakes and lizards) (7,910 species)
Class Aves /Birds (10,000 species)
Class Mammals
-Order Monotremes (Lay eggs) (5 species)
-Infra-Class Marsupials (Mammals with a pouch) (324 species)
-Clade Eutherians (Placental mammals) (5,010 species)
Assignment:
-You need to pick one of each
-Amphibian
-Reptile
-Bird
-Mammal
-Fish
And you will teach the class about your chosen animals