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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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Urochordates tunicates sea squirts

Protochordates include

Urochordates = Tunicates = Sea squirts

(See figure 2-2 in text)


Urochordates tunicates sea squirts

Underappreciated

beauty

of tunicates


Urochordates tunicates sea squirts

Dorsal hollow nerve cord

Muscular post

anal tail

Notochord

Adhesive

surface

Pharynx with endostyle

Larva “stands

on its head”

and attaches

to surface




Urochordates tunicates sea squirts

Living Agnaths - Lamprey

Hagfish

Where’s the link to protochordates?


Urochordates tunicates sea squirts

Lamprey larva = Ammocoetes

See figure 3-6

Tunicate larva




Urochordates tunicates sea squirts

Human influences life span

1800’s Erie canal

Weeland canal around Niagra falls !




Urochordates tunicates sea squirts

AKA Slime eels! life span




Urochordates tunicates sea squirts

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

in the Cambrian!!!!

Haikouichthys

Myllokumingia