Protochordates include
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Urochordates = Tunicates = Sea squirts PowerPoint PPT Presentation


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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

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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


Urochordate larva – diagrams don’t do it justice!


Cephalochordates = Amphioxus = Lancelets

(See figure 2-2 in text)


Living Agnaths - Lamprey

Hagfish

Where’s the link to protochordates?


Lamprey larva = Ammocoetes

See figure 3-6

Tunicate larva


Lamprey- Vertebrate Ectoparasites


Estimates of 30-40lbs of fish killed by a lamprey in adult life span


Human influences

1800’s Erie canal

Weeland canal around Niagra falls !


Lamprey Control: Exploiting basic natural history


Lamprey Control: Larvicides and spawning barriers


AKA Slime eels!


Even Hagfish can be beautiful!


Ordovician Agnaths - Ostracoderms


A Recent Surprise – Vertebrates (or at least Craniates)

in the Cambrian!!!!

Haikouichthys

Myllokumingia


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