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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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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

Urochordate larva – diagrams don’t do it justice!


Urochordates tunicates sea squirts

Cephalochordates = Amphioxus = Lancelets

(See figure 2-2 in text)


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

Lamprey- Vertebrate Ectoparasites


Urochordates tunicates sea squirts

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


Urochordates tunicates sea squirts

Human influences

1800’s Erie canal

Weeland canal around Niagra falls !


Urochordates tunicates sea squirts

Lamprey Control: Exploiting basic natural history


Urochordates tunicates sea squirts

Lamprey Control: Larvicides and spawning barriers


Urochordates tunicates sea squirts

AKA Slime eels!


Urochordates tunicates sea squirts

Even Hagfish can be beautiful!


Urochordates tunicates sea squirts

Ordovician Agnaths - Ostracoderms


Urochordates tunicates sea squirts

A Recent Surprise – Vertebrates (or at least Craniates)

in the Cambrian!!!!

Haikouichthys

Myllokumingia


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