Intro to VertebratesChapter 16

Kingdom: AnimaliaPhylum: Chordata

Chordate

Chordate -

Animals with Notochord

Notochord - Rod that supports animal

Chordate Subgroups

Cephalochordates

Lancelets

Buried in sand/shallow sea

Simple Backbone

Chordate Subgroups

Urochordata

Larvae Notochord, lost in adulthood

Sea Squirts

Chordate Subgroups

Vertebrata

Backbone or spinal column

Also called Craniata

Cranium

Chordate CharacteristicsEndotherms

Can maintain a constant internal Temperature

WARM BLOODED

Ectotherms

Need outside sources of heat

COLD BLOODED

Fishes16-1

Fish Characteristics25000 species

Brain that tracks senses

Sight, Smell, Hearing

Lateral Line

Rows of nerves that sense water vibration

Fish Characteristics

Gills

Remove O2 From water

Removes CO2 From Blood

Fish characteristics

Reproduction

External Fertilization

Unfertilized Eggs in Nest,

Male swims over & Fertilizes

Reproduction Cont.

Internal Fertilization

Female deposits Eggs in Nest

Embryos develop inside Female

Fish Anatomy

Types of Fishes

Jawless

Eel-like

Notochord-No backbone

Scavengers or Parasites

Hagfish & Lampreys

Types of Fishes

Cartilaginous

Skeleton stays as cartilage

More Dense than Water - must keep moving

Keeps water moving through gills

Types of FishesBony Fish

Common

1cm - 8.6m

Skeleton of bone

Swim Bladder

Gas filled sac, control buoyancy

Bony Fishes

Two Main Groups

Ray Finned

Most bony fish

Pair of fins connected by bone

Eels, trout, minnows, pearch

Fin Groups

Lobe-finned group

Muscular and think

7 species

6 of them Lung fish

Possible descendents of Amphibians