Membranous structures associated with septal pore(s) |
septal pore cap |
1 |
|
Septal pore cap basic structure |
simple cap (cap with unelaborated abseptal surface) |
2 |
|
Detailed structure of elaborated septal pore cap |
elaborated cap absent |
0 |
|
Detailed structure of simple septal pore cap |
cap imperforate or uniperforate, curved |
2 |
|
Saccules of elaborated pore cap lined with external electron-dense layer |
absent |
0 |
|
Substructure of pore cap |
cap with three internal layers (central electron-dense layer between two less electron dense layers) |
3 |
|