Lecture 26: Deuterostomia Flashcards
1
Q
Deuterostomia phylums?
A
Echinoderms and chordata
2
Q
Deuterostomia traits?
A
Triploplastic
radial, indeterminate cleavage
3
Q
Phylum Echinodermata
A
sea stars, sea urchins, sea lilies, sea cucumbers calcareous endoskeleton Slow, sessile No central brain Adults have penta radial symmetry Larvae bilateral tho Usually separate sexes Water vasc system
4
Q
Water vascular system?
A
water pressure + adhesive –> operate tube feet (ampulla + podium)
5
Q
Tube feet?
A
Locomotion, gas exchange, feeding
6
Q
Class asteroidea?
A
5 arms (or more) –Active, predatory
7
Q
Class echinoidea?
A
Sea urchins and sand dollars
Spines for locomotion and protection
eat seaweed
8
Q
Class Holothuroidea?
A
Sea cucumbers
Secondary bilateral symmetry
Deposit (bottom feeder) or suspension feeders
9
Q
Ecology & Importance?
A
sea stars are important predators
Food for humans
