urochordates = tunicates = sea squirts protochordates include (see figure 2-2 in text)
TRANSCRIPT
Urochordates = Tunicates = Sea squirts
Protochordates include
(See figure 2-2 in text)
Underappreciated beauty of tunicates
NotochordDorsal hollow nerve cord
Pharynx with endostyle
Muscular post anal tailAdhesive
surface
Larva “stands on its head”and attachesto 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
Tunicate larva
See figure 3-6
Lamprey- Vertebrate Ectoparasites
Estimates of 30-40lbs of fish killed by a lamprey in adult life span
Human influences 1800’s Erie canalWeeland canal around Niagra falls !
Lamprey Control: Exploiting basic natural history
Lamprey Control: Larvicides and spawning barriers
Even Hagfish can be beautiful!
Ordovician Agnaths - Ostracoderms
Myllokumingia Haikouichthys
A Recent Surprise – Vertebrates (or at least Craniates)in the Cambrian!!!!