Lecture 24

Question 1

What two phyla does Deuterostomia include

Answer 1

Echinodermata & Chordata

Question 2

What are Echinodermata

Answer 2

sea stars, sea urchins, sea lilies, sea cucumbers
-slow & sessile
-diffuse nervous system (no brain)
-mouth at center of arms

Question 3

Characteristics of echinodermata

Answer 3

Adults: Penta-radial symmetry
-engage in broadcast spawning (fertilization occurs in open water)
-larvae are planktonic
-have tube feet

Question 4

What does madreporite mean

Answer 4

allows water to flow in & out of the system

Question 5

What are the 5 Echinoderm classes

Answer 5

1. Class Asteroidea (sea stars/sun stars)
2. Class Echinoidea (sea urchins/sand dollars)
3. Class Holothuroidea (sea cucumbers)