Chordates and Vertebrates Guiding Questions What are the
Chordates and Vertebrates Guiding Questions: ● What are the characteristics of chordates? ● What is the difference between a chordate and a vertebrate?
Examples of Chordates: (Shark, Kingfisher, Bearded Dragon, Scented Monkey) What do they all have in common? List other examples.
A tunicate (sea squirt) belongs to the: Kingdom Animalia Phylum Chordata Subphylum Tunicata *not a vertebrate Also called “Sea Squirts”
Characteristics of Chordates All chordates, like these tunicates, have those features; even humans!
1. Three Germ Layers (Triploblasts) Ectoderm outer covering (skin) Endoderm Mesoderm (coelom) Organs Muscles Circulatory Gut
Development Zygote → Blastula Protostomes = most invertebrates mouth first Deuterostomes = chordates and starfish anus first
2. Notochord - rod-like, support structure Body Plan of a Lancelet All chordates have this structure, in vertebrates it is replaced with a backbone.
3. Dorsal Nerve Cord Develops into the brain and spinal cord in most adult vertebrates 4. Pharyngeal Slits - feeding, respiration Aquatic - becomes gills | Non-aquatic - becomes ear
5. Segmentation and Symmetry Visible in skeleton Bilateral - left and right sides
6. Post-Anal Tail Human Embryo - 5 weeks old
7. Closed Circulatory System - all blood contained in vessels Open Circulatory System Closed Circulatory System
Crash Course in Chordates - 12 minutes Take notes as you watch! Be prepared to share!
Synthesis - A starfish is a deuterostome, why is it not classified as a chordate? Discuss with your lab partner and write down your answer, be prepared to share with the class. Assignment: Chordate Anatomy
Synthesis - Examine the organism shown, do you think it is a chordate? What would you need to find out to make the determination?
- Slides: 14