Phylum chordata

Phylum chordata

1. Phylum ChordataPhylum Chordata

2. Characteristics of Characteristics of
ChordatesChordates
►NotochordNotochord
►Dorsal nerve cordDorsal nerve cord
►Pharyngeal pouches or gill slitsPharyngeal pouches or gill slits
►Postanal tailPostanal tail

3. ►Subphylum Subphylum
CephalocharodataCephalocharodata
- - This subphylum is This subphylum is
composed of about 2 composed of about 2
dozen blade-shaped dozen blade-shaped
animals known as animals known as
lancelets. They retain lancelets. They retain
all characteristic all characteristic
throughout life.throughout life.
►Subphylum Subphylum
Urochordata- Urochordata- This This
subphylum is subphylum is
commonly known as commonly known as
tunicates ( sea squirts). tunicates ( sea squirts).
Larva posses all Larva posses all
chordate chordate
characteristics while characteristics while
adults exhibit only adults exhibit only
Pharyngeal pouches.Pharyngeal pouches.

4. Subphylum VertebrataSubphylum Vertebrata
►All characteristics All characteristics
of chordatesof chordates
►Distinguishing Distinguishing
characteristicscharacteristics
Vertebral column or Vertebral column or
spinespine
Cranium or skull Cranium or skull
that protects the that protects the
brainbrain
Endoskeleton Endoskeleton
composed of bone composed of bone
or cartilageor cartilage

5. Major groups of VertebratesMajor groups of Vertebrates

6. Lampreys and HagfishesLampreys and Hagfishes
►Long, eel-like bodiesLong, eel-like bodies
►Lack jawsLack jaws
►Paired finsPaired fins
►bonesbones

7. Sharks, Skates and RaysSharks, Skates and Rays
►Class Class
ChondrichthyeChondrichthye
ss
JawsJaws
Paired finsPaired fins
Skeleton of Skeleton of
cartilagecartilage

8. Boney FishesBoney Fishes
►Class Class
OsteichthyesOsteichthyes
JawsJaws
Most have a Most have a
skeleton skeleton
composed of composed of
bonebone

9. AmphibiansAmphibians
►Class AmphibiaClass Amphibia
Included frogs, Included frogs,
toads and toads and
salamanderssalamanders
Skin is moist and Skin is moist and
permeable to permeable to
gases and watergases and water
Most lay eggs in Most lay eggs in
waterwater
Most have an Most have an
aquatic larval aquatic larval
stagestage

10. ReptilesReptiles
►Class ReptiliaClass Reptilia
Turtles, Turtles,
crocodiles, crocodiles,
alligators, lizards alligators, lizards
and snakesand snakes
Skin is dry and Skin is dry and
scalyscaly
Eggs that can be Eggs that can be
laid on landlaid on land

11. BirdsBirds
►Class AvesClass Aves
Adapted for flightAdapted for flight
►FeathersFeathers
►Hollow bonesHollow bones
►Unique Unique
respiratory systemrespiratory system

12. MammalsMammals
►CharacteristicsCharacteristics
EndothermyEndothermy
HairHair
Completely divided four chamber heartCompletely divided four chamber heart
Milk produced from mammary glandMilk produced from mammary gland
Single jawboneSingle jawbone
Specialized teethSpecialized teeth

13. Order MonotremataOrder Monotremata
►Egg-laying mammalsEgg-laying mammals
►Most primitive of mammalsMost primitive of mammals
►Only three speciesOnly three species
Two anteaters and one platypusTwo anteaters and one platypus

14. Order MarsupialiaOrder Marsupialia
►250 species250 species
►The U.S. has only one species – the Virginia The U.S. has only one species – the Virginia
opossumopossum
►Young develop in a pouchYoung develop in a pouch

15. Placental MammalsPlacental Mammals
►Diverse group composed of at least 18 Diverse group composed of at least 18
ordersorders
►95% of mammals are placental95% of mammals are placental
►They live on land, in water and the airThey live on land, in water and the air