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Intro to Chordates p. 270-274. Superc lass Agnatha. Integument: slimy skin Temperature control: e ctotherm Limb Structure: no paired limbs Gas Exchange: gills Fertilization: external. Class Chondrichthyes. Integument: scales Temperature control: e ctotherm - PowerPoint PPT Presentation
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Intro to Chordates
p. 270-274
Superclass AgnathaIntegument: slimy skin
Temperature control: ectotherm
Limb Structure: no paired limbs
Gas Exchange: gills
Fertilization: external
Class ChondrichthyesIntegument: scales
Temperature control: ectotherm
Limb Structure: 2 pairs of fins
Gas Exchange: gills
Fertilization: internal
Class OsteichthyesIntegument: slimy skin and scales
Temperature control: ectotherm
Limb Structure: 2 pairs of fins
Gas Exchange: gills
Fertilization: external
Class AmphibiaIntegument: thin, moist skin
Temperature control: ectotherm
Limb Structure: 2 pairs of legs
Gas Exchange: gills, lungs, skin
Fertilization: external
Class ReptiliaIntegument: dry, scaly
Temperature control: ectotherm
Limb Structure: 2 pairs of legs
Gas Exchange: lungs
Fertilization: internal
Class AvesIntegument: feathers
Temperature control: endotherm
Limb Structure: wings, one pair legs
Gas Exchange: lungs
Fertilization: internal
Class MammaliaIntegument: hair
Temperature control: endotherm
Limb Structure: 2 pairs of legs
Gas Exchange: lungs
Fertilization: internal
Hallmarks of Phylum Chordata
Notochord
Single, tubular, dorsal nerve cord
Pharyngeal slits
Postanal tail
Endostyle
* Characteristic present at some point during development!!!
Superclass Agnathap. 287-291
“circular mouths”
In place of jaws is an oral sucker
Most primitive of all fish
External fertilization
No stomach
Heart: 2 chambers (1 ventricle; 1 artia)
No fins
Eel body form
Poor eye development (hagfish only)
Pore-like gill openings
Class MyxiniIncludes hagfish
Feed on dead or dying fishScavengersCompletely blind, well developed sense of smell
and touchGenerate large amounts of slime for defense
Class PetromyzonesIncludes lampreys
Most are parasitic, feed on blood and fluids of fishDestructive to fisheries (ex. Great Lakes)
Millions of dollars lost each year