Centriole |
absent |
0 |
|
Basic organization of the spindle pole |
spindle pole body a plaque or disc |
3 |
 |
Spindle pole body form, interphase-prophase |
a 3-layered disc |
3 |
 |
Metaphase nuclear envelope |
intact with small polar fenestrae plugged by the spindle pole bodies |
1 |
 |
Perinuclear endoplasmic reticulum |
absent |
0 |
|
Spindle vesicles |
present |
1 |
 |
Central spindle |
present |
1 |
 |
Metaphase plate |
absent |
0 |
 |
Spindle pole body cap |
distinct from nuclear envelope |
2 |
 |
Transient intranuclear element at late interphase-prophase |
present within nucleus opposite the extranuclear spindle pole body |
1 |
 |