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Protochordates include. Urochordates = Tunicates = Sea squirts. (See figure 2-2 in text). Underappreciated beauty of tunicates. Dorsal hollow nerve cord. Muscular post anal tail. Notochord. Adhesive surface. Pharynx with endostyle. Larva “stands on its head” and attaches

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Protochordates include

Urochordates = Tunicates = Sea squirts

(See figure 2-2 in text)


Underappreciated

beauty

of tunicates


Dorsal hollow nerve cord

Muscular post

anal tail

Notochord

Adhesive

surface

Pharynx with endostyle

Larva “stands

on its head”

and attaches

to surface




Living Agnaths - Lamprey

Hagfish

Where’s the link to protochordates?


Lamprey larva = Ammocoetes

See figure 3-6

Tunicate larva




Human influences life span

1800’s Erie canal

Weeland canal around Niagra falls !




AKA Slime eels! life span




A Recent Surprise – Vertebrates (or at least Craniates) life span

in the Cambrian!!!!

Haikouichthys

Myllokumingia


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