Animal Diversity Lecture 7
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29 Terms
Notochord
Cartilage
Dorsal, Hollow Nerve Cord
Spinal cord in humans
Cephalochordata
Lancelets or Amphioxus
Cephalochordata
Marine, ~25 species
Cephalochordata
Inhabit shallow coastal waters
Urochordata
Tunicates or Sea Squirts
Urochordata
Marine, ~3,000 species
Myxini
Hagfish
Myxini
Marine, bottom-dwelling scavengers
Myxini
Cartilagenous skull
Myxini
Lack Jaws
Myxini
Single eye and nasal opening
Myxini
Keratin based teeth
Petromyzontida
Lamprey
Petromyzontida
Freshwater and marine
Petromyzontida
Jawless
Petromyzontida
Larvae also known as ammocoetes larva
Petromyzontida
Benthic filter feeders, similar to lancelets
Petromyzontida
Adults are giant fish ectoparasites
Petromyzontida
Use rasping tongue to penetrate skin
jaws, mineralized skeleton, appendicular skeleton
Gnanthostomes have
Evolution of Jaws
ancestral pharyngeal gill arches form upper and lower jaws
Amniotes
Mammalia, Reptilia
Tetrapods
Amphibia
Lobe-fins
Dipnoi, Actinistia
Osteichthyans
Actinopterygii
Gnathostomes
Chondrichthyes
Vertebrates/Craniates
Petromyzontida, Myxini
Chordates
Urochordata, Cephalochordata
Note 
Flashcards (20)