1 - Lecture 33 Notes

Internal skeleton with vertebrae 2 jaws 3 two pairs

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: erostomes with… 1.  Notochord 2.  Dorsal hollow nerve cord 3.  Postanal tail 4.  Pharyngeal slits at least in embryo Other important innova*ons arose within chordates including… 1.  Internal skeleton with vertebrae 2.  Jaws 3.  Two pairs of walking limbs Chordate features Notochord •  dorsal suppor*ng rod, semi ­rigid yet flexible •  mesodermal in origin •  develops in embryo (replaced by vertebrae in most vertebrates) •  in more ancestral taxa rigidity allowed use of muscles aSached to it for locomo*on notochord Chordate features Notochord •  dorsal suppor*ng rod, semi ­rigid yet flexible •  mesodermal in origin •  develops in embryo (replaced by vertebrae in most vertebrates) •  in more ancestral taxa rigidity allowed use of muscles aSached it for locomo*on hSp://classconnec*on.s3.amazonaws.com/ 729/flashcards/1803729/png/ embryodisc1348356076563.png hSp://bio1151.nicerweb.com/Locked/media/ ch34/34_vertebra_discs.gif Chordate features Notochord Dorsal hollow nerve cord •  develops from infolding of ectoderm above the notochord notochord dorsal hollow nerve Chordate features Notochord Dorsal hollow nerve cord Postanal tail •  combined with notochord and musculature → propulsion •  most other animals have a terminal anus dorsal hollow nerve n...
View Full Document

Ask a homework question - tutors are online