Lab 2: Chordates and Vertebrates (Amphioxus, Ammocoetes, Adult Lamprey)

pharynx (amphioxus)

notochord (amphioxus)

nerve cord (amphioxus)

buccal cirri (amphioxus)

oral hood (amphioxus)

pharynx (amphioxus)

pharyngeal bar (amphioxus)

pharyngeal slit (amphioxus)

1. notochord (amphioxus)

2. nerve cord (amphioxus)

atrium (amphioxus)

1. myomere (amphioxus)

2. myosepta (amphioxus)

ovaries (amphioxus)

testes (amphioxus)

intestine (amphioxus)

1. notochord (amphioxus)

2. nerve cord (amphioxus)

left arrow: anus (amphioxus)

right arrow: intestine (amphioxus)

atriopore (amphioxus)

endostyle (amphioxus)

ammocoetes

1. nerve cord

2. notochord

3. sub-pharyngeal organ

4. brain

5. eye

6. oral hood

ammocotes

1. anus

2. intestine

3. notochord

4. nerve cord

ammocoetes

1. oral hood space

2. notochord

3. brain

4. eye

ammocoetes

1. pharynx

2. gills

3. external gill slits

4. notochord

5. nerve cord

ammocoetes

1. intestine

2. notochord

3. nerve cord

sub-pharyngeal organ (ammocoetes)

brain (ammocoetes)

heart (ammocoetes)

1. Pineal organ

2. nostril

1. buccal funnel

2. eye

3. external gill slits

heart

1. notochord

2. nerve cord/spinal cord

1. olfactory sac

2. nostril

tongue with tooth

pharynx

1. liver

2. heart

1. liver

2. heart

3. ventral aorta

4. dorsal aorta

1. notochord

2. nerve cord

gills

1. notochord

2. nerve cord

1. heart

2. liver

branchial basket

1. cloacal aperture

2. urogenital papilla

1. ovaries

2. kidney

3. myosepta

4. myomere

buccal funnel