Locomotion

Question 1

List 5 fundamentally different types of locomotion in marine invertebrates (including protists) and give a marine invertebrate example for each type.

Answer 1

1. Ciliary Locomotion (Protist)
2. Jet Propulsion (Squid)
3. Muscular/Hydrostatic propulsion (Sea Star)
4. Undulatory Swimming (Polychaete Worm)
5. Retrograde/Direct Waves (R-Limpet, D-Marine Snail)

Question 2

Explain retrograde waves

Answer 2

wave of contraction of circular/longitudinal muscles in opposite direction the animal is travelling in

Question 3

Explain direct waves

Answer 3

Anchors anterior segments, pulls posterior end forward