| |
Sea urchin |
C. elegans |
Human |
| Symmetry |
Fivefold |
Bilateral |
Bilateral |
| Sexes |
Male/Female |
Hermaphrodite/ Male |
Male/Female |
| Fertilization |
External |
Internal |
Internal |
| Sperm motility |
Flagellum |
Amoeboid |
Flagellum |
| Acrosome reaction |
Yes |
No |
Yes |
| Membrane remodeling |
No |
Yes |
Yes |
| Cytoskeleton remodeling |
Actin |
MSP |
Actin |
| Time for sperm activation |
Seconds |
Days |
Hours to days |
|
