1 - Lecture 33 Notes

1 - Lecture 33 Notes - Lecture 33 Chordata I Introduc*on to...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture’33.’ Chordata’I’ Introduc*on to Chordates Students’should’be’able’to :’ •Describe the defning Features oF the Chordates •describe the posi*on and Func*on oF the notochord •explain how the vertebral column Forms in development and how it relates to the notochord •explain how jaws evolved and what evidence supports this idea
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
What’are’chordates?’ Lancelets, sea squirts, jawless fshes, jawed fshes, and tetrapods (amphibians, rep*les, mammals) Diverse (and oCen dominant) group oF animals, both on land and in water.
Background image of page 2
Major lineages of metazoans Deuterostome traits radial cleavage blastopore anus enterocoely
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Major lineages of metazoans Deuterostome traits radial cleavage blastopore anus enterocoely
Background image of page 4
What’are’chordates?’ Deuterostomes’with…’ 1. Notochord 2. Dorsal hollow nerve cord 3. Postanal tail 4. Pharyngeal slits
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
What are chordates? Deuterostomes with… 1. Notochord 2. Dorsal hollow nerve cord 3. Postanal tail 4. Pharyngeal slits at least in embryo
Background image of page 6
Other important innova*ons arose within chordates including… 1. Internal skeleton with vertebrae 2. Jaws 3. Two pairs of walking limbs
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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’
Background image of page 8
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://bio1151.nicerweb.com/Locked/media/ ch34/34_vertebra_discs.gif hSp://classconnec*on.s3.amazonaws.com/ 729/flashcards/1803729/png/ embryodisc1348356076563.png
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chordate’features’ Notochord’ Dorsal’hollow’nerve’cord’ develops from infolding of ectoderm above the notochord notochord’ dorsal’hollow’nerve’
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 61

1 - Lecture 33 Notes - Lecture 33 Chordata I Introduc*on to...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online