Chordata notes - Fall 2007

Chordata notes - Fall 2007 - Survey of the Animal Kingdom...

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Survey of the Animal Kingdom Phylum Chordata Phylum Chordata = Chordates - 4 characteristics during life cycle o Dorsal hollow nerve cord (develops into spinal cord in vertebrates) o Notochord (develops into vertebral column in vertebrates) o Pharyngeal gill slits/pouches o Post-anal tail - Many have endoskeleton - Well-developed organ systems - Three subphyla: Urochordata, Cephalochordata, Vertebrata Subphylum Urochordata = Tunicates/Sea Squirts - Larvae are free-swimming; tadpole-like; and have all 4 chordate characteristics - Adults are sessile; lost 3 chordate characteristics – only have pharyngeal gill slits - Marine organisms - Adults are filter-feeders - Covered with cellulose tunic - See model, preserved specimens, and slide of tunicate larvae Subphylum Cephalochordata = lancelets (Amphioxus) - Small, marine, fish-like organisms; burrow in sand/mud - Adults have all 4 chordate characteristics - See models, preserved specimens, and slides (both wm and x-section through pharynx) Subphylum Vertebrata = Vertebrates
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This note was uploaded on 04/09/2008 for the course BIOL 111L taught by Professor Garanich during the Spring '08 term at St. Francis PA.

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Chordata notes - Fall 2007 - Survey of the Animal Kingdom...

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