Vertebrate Zoo L1
- Created by: ValentineDevil
- Created on: 24-01-19 14:50
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- Vertebrate Zoo Lecture 1
- Define and Diagnose
- Diagnose
- shared characteristic
- E.g. Extant mammals: shared possession of hair, three middle ear bones, mammary glands....
- shared characteristic
- Define
- common ancestry (taxonomic membership)
- E.g. Extant mammals: all living monotremes, placentals and marsupials
- common ancestry (taxonomic membership)
- Diagnose
- What are vertebrates?
- Cartilagious fish
- Bony fish
- Amphibians
- Reptiles
- Birds
- Mammals
- Debatable organisms...
- Hagfish and Lampreys
- Both closely related. Currently both lumped in with verts.
- Displays chordate features (larval form) such as the post-anal tail; notochord; endostyle
- Hagfish and Lampreys
- Deuterostomes- Chordates
- Coelom forms from embryonic gut.
- Process similar to invertebrates, except that the mesoderm doesn't form as an outpouching of the embryonic gut.
- At least primitively or in some stage of their development have several features.
- Diagnostic features of Chordate Deuterostomes
- Notochord
- DOESN'T change into the backbone, but is REPLACED by vertebrae.
- Plays a role in inducing the formation of the hollow nerve cord (neural tube) dorsal to it
- 1. Notochord forms from mesoderm cells soon after gastrulation is complete.
- 2. Signals from notochord cause inward folding of ectoderm at the neural plate.
- 3. Ends of neural plate fuse and disconnect to form an autonomous neural tube.
- 2. Signals from notochord cause inward folding of ectoderm at the neural plate.
- 1. Notochord forms from mesoderm cells soon after gastrulation is complete.
- Hollow dorsal nerve chord
- Spinal nerves
- Untitled
- Spinal ganglia
- Post-anal tail
- Metametric muscle blocks
- Endostyle
- Pharyngeal site
- Notochord
- Diagnostic features of Chordate Deuterostomes
- The Lancelet (Amphioxus): thought to approximate the morphology of the earliest chordates.
- Deuterostome characteristics of vertebrates
- Indeterminate cell fate at 8-cell stage.
- Radial cleavage
- Enterocoely
- Deuterostomy
- Coelom forms from embryonic gut.
- Diagnostic features of Chordate Deuterostomes
- Notochord
- DOESN'T change into the backbone, but is REPLACED by vertebrae.
- Plays a role in inducing the formation of the hollow nerve cord (neural tube) dorsal to it
- 1. Notochord forms from mesoderm cells soon after gastrulation is complete.
- 2. Signals from notochord cause inward folding of ectoderm at the neural plate.
- 3. Ends of neural plate fuse and disconnect to form an autonomous neural tube.
- 2. Signals from notochord cause inward folding of ectoderm at the neural plate.
- 1. Notochord forms from mesoderm cells soon after gastrulation is complete.
- Hollow dorsal nerve chord
- Spinal nerves
- Untitled
- Spinal ganglia
- Post-anal tail
- Metametric muscle blocks
- Endostyle
- Pharyngeal site
- Notochord
- Define and Diagnose
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