Lec33_Ecdysozoans

Lec33_Ecdysozoans - BioG1780 Evolution and Biodiversity...

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BioG1780 Fall 2010 Evolution and Biodiversity Today’s lecturer: Harry Greene Lectures 33: November 17, 2010 1. Animals—Living with armor--Ecdysozoa. We’ll cover the most diverse and species-rich adaptive radiation of animals, the ecdysozoans, as dealt with in Sadava et al. Ch 32, pp. 679-690. 2. What are ecdysozoans? These protostomes are characterized by an external covering or cuticle and by periodically shedding their skins (a process known as ecdysis or molting). Many basal ecdysozoans are worm-like, where as the derived and highly speciose arthropods have a rigid exoskeleton and jointed appendages. Here’s a phylogenetic classification down through the organisms under consideration in this lecture—see if you can draw the corresponding phylogenetic tree. Uniconts Amoebozoans Opisthoconts Fungi Un-named taxon Choanoflagellates Animals Sponges Eumetazoans Radials Bilaterians Deuterostomes Protostomes Lophotrochozoans Ecdysozoans Priapulids [Un-named taxon] Nematodes
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  • '10
  • HARRISON
  • un-named taxon, Onycophorans Arthropods Myriapods, highly speciose arthropods, Fungi Un-named taxon, Bilaterians Deuterostomes Protostomes Lophotrochozoans Ecdysozoans Priapulids

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Lec33_Ecdysozoans - BioG1780 Evolution and Biodiversity...

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