Ch 15 Chordates Flashcards
What are the 5 unique characteristics all chordates share?
Bilateral Complete digestive tract Cephalized Coelomate Deuterostomes Segmented notochord stiff tissue that supports the body.
What is the notochord?
cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
What does the notochord do?
plays an organizational role in nervous system development.
What is the dorsal tubular never chord?
Develops into spinal cord and brain in advanced vertebrates
What is in subphylum cephalochordate?
Lancelets
What animals are in subphylum Urochodata?
Why are they called what they are called?
Tunicates “ comes from the firm, but flexible body covering, called a tunic.
Do chordates have an open or closed circulatory system?
closed circulatory system
Tunicates:
Where could you find them?
Found in intertidal zones
Tunicates
Do they have all 5 chordate characteristics as adults?
Adults retain endostyle and pharyngeal gills slits
Lancelets
Describe them
5 to 7 cm thin, flat, translucent and fish-like
Lancelets
How do they eat?
filter feeding system to consume microorganisms
Lancelets
Do they retain all four chordate characteristics as adults?
In the adult stage, the notochord, nerve
