Endoskeleton is made of what?
Cartilage or bone made of collagen and crystals of calcium phosphate salt
What does the endoskeleton allow?
Large sizes and powerful movement in vertebrata
What is the neural crest?
Group of embryonic cells that contributes
What does the excurrent siphon in Urochordata do?
Remove waste and water
T/F Urochordata are gonochoric.
False, they are hermaphroditic
What kind of fertilization do urochordata undergo?
What are lancelets?
Scaleless marine chordat
Describe the body cavity of chordates?
Are chordates deuterostomes or protsostomes?
What are the closest relatives oc chordates?
What are examples of chordates?
Tunicates, lancelets, fishes, aphibians, reptiles, bird
Hagfish and lampreys belong to what class?
Skates, sharks, and rays belong to what class?
Bony fish belong oto what class?
Caecilians, frogs, slamanders, toads, and newts belong to what class?
How do lancelets feed?
Filter feed via cilia generated currents
What species are the closest relatives to vertebrates?
In what part of a lancelets life cycle does it lack some of the chordate
No part of its life cycle
T/F Tunicates live in marine environments.
How do adult tunicates move and feed?
They are sessile filter feeders
What do adult tunicates lack from their larval stage?
They lack their tail and notochord
What is a tumic?
A cellulose sace that adult tu
T/F Pharygeal slits are closed to the outside.
False, they are open to the outside
What are the closest relatives of echinoderms?
What kind of nerve cord do most chordates have?
Dorsal nerve cord
What are the subphyla of chordata?
T/F Lancelets are strong swimmers.
False, they are weak swimmers due to their weak muscles
Vertebrata all have what feature?
Vertebral column that consists of vertebrae
What do vertebrae do?
Enclose and protect the dorsal nerve cord
T/F All vertebrata ha
The dorsal nerve cord differentiates into what 2 features?
Spinal cord and brain
Pharyngeal slits have what feature present in all vertebrate embryos?
What structure is located at the opposte end of the dorsal in chordate embryos?
What subphylum has incurrent and excurrent siphons?
What is an endostyle and what has them?
Longitudinal ciliated groove in the pharynx in Urochordata
How does the endostyle get food?
It traps food particles by secreting mucus