1/9/2013 1 Topic 3: Evolution & Diversity of Vertebrates What are the protochordates? A phylogenetic perspective Relationship to craniates What are the key characteristics of chordates? What are the main Protochordate clades? What are the differences between craniates and vertebrates? What are the protochordates? Protochordates are ______________ Hemichordata Pterobranchia Enteropneusta – acorn worms Urochordata Tunicates Cephalochordata Lancelets Modified: Liem et al. 2001, Fig. 2-1 Protostomes Echinoderms Pterobranchia Enteropneusta Urochordata Cephalochordata Craniata Chordata Hemichordata Deuterostomes What are the protochordates? What sort of phylogenetic group are protochordates? What does this mean? ________________ ________________ ________________ ________________ Modified: Liem et al. 2001, Fig. 2-1 Protostomes Echinoderms Pterobranchia Enteropneusta Urochordata Cephalochordata Craniata Chordata Hemichordata Deuterostomes What are the protochordates? What insights might the study of protochordates give us? Modified: Liem et al. 2001, Fig. 2-1 Protostomes Echinoderms Pterobranchia Enteropneusta Urochordata Cephalochordata Craniata Chordata Hemichordata Deuterostomes
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Topic 3: Evolution & Diversity of What are the ... · LanceletsWhat are the differences between ... Urochordata Cephalochordata Craniata Chordata Hemichordata What are the protochordates?
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1/9/2013
1
Topic 3: Evolution & Diversity of
Vertebrates
� What are the protochordates?
� A phylogenetic perspective
� Relationship to craniates
� What are the key characteristics of chordates?
� What are the main Protochordate clades?
� What are the differences between craniates and vertebrates?
What are the protochordates?
� Protochordates are ______________
� Hemichordata
� Pterobranchia
� Enteropneusta –acorn worms
� Urochordata
� Tunicates
� Cephalochordata
� Lancelets
Modified: Liem et al. 2001, Fig. 2-1
Protostomes
Echinoderms
Pterobranchia
Enteropneusta
Urochordata
Cephalochordata
Craniata
Chordata
Hemichordata
Deuterostomes
What are the protochordates?
� What sort of phylogenetic group are protochordates?
� What does this mean?
� ________________ ________________
� ________________ ________________
Modified: Liem et al. 2001, Fig. 2-1
Protostomes
Echinoderms
Pterobranchia
Enteropneusta
Urochordata
Cephalochordata
Craniata
Chordata
Hemichordata
Deuterostomes
What are the protochordates?
� What insights might the study of protochordates give us?