deuterostome lab t zslides
Post on 17-Aug-2015
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Deuterostomes
• First embryonic opening becomes the anus• Includes the phyla Echinodermata and Chordata
Echinodermata
• Marine animals• Bilateral symmetry (larvae)• Three ?ssue layers• Coelomates• Hard exoskeleton
– Name means “spiny skinned”
• Movement: water vascular system– Tube feet that create or release suc?on
• Today: Dissect starfish
Examples of bilateral larvae
Chordata
• Not all chordates are vertebrates• Chordates have the following characteris?cs as
embryos:• Dorsal (back) tubular nerve cord• A notochord
– Suppor?ve rod
• A post anal tail• Pharyngeal pouches that become gill slits
Visual of chordate characteristi cs
Tunicates (Urochordates)
• Invertebrate chordates• Adults maintain gill slits• Observe pictures and models in lab
Cephalochordates• Invertebrates• Lancelet example• Adult has all 4
characteris?cs• Observe pictures and
models in lab
Vertebrate Innova?ons• Vertebral column• Segementa?on and specializa?on• Complex brain and cephaliza?on• Jaws• Paired fins, gave rise to limbs• Gills, evolved into lungs
Today: Frog
•Amphibian•First vertebrate able to live on land• Important external
structures:– Tympanum: internal
ear/eardrum– Nares:
nostril/breathing hole
Frog Mouth• Eustacian tube: leads to ears• Maxillary and vomerine teeth• GloUs: opens to larnyx, vocal cords• Esophogus: leads to stomach
Internal Frog
• If female, find ovaries with eggs• Iden?fy two lungs (par?ally hidden by liver)
Internal Frog Conti nued
• Liver and gallbladder
• Esophagus and stomach
• Small and large intes?nes
• Pancreas and sple
• Fat bodies: store fa
ent
Internal Frog Conti nued
• Heart covered by pericardium– Three chambers (1 ventricle, 2 atria)
Internal Frog Con?nued•Kidneys (long and narrow)• Testes (yellow and oval)• Mesonephric ducts: carry urine•Cloaca: opening to outside
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