| Species | Ectomesoderm | Endomesoderm | Reference |
---|---|---|---|---|
Nemertean | Cerebratulus | 3a, 3b | 4d | [26] |
Polyclad tubellarian | Hoploplana | 2b | 4d | |
 | Chaetopleura | None | 3D | [8] |
Mollusk | Patella | 3a, 3b | 3D | [25] |
 | Ilyanassa | 2b, 2c, 3d, 3A, 3B, 3C | 4d | [28] |
 | Crepidula | 2c, 3a, 3b | 4d | [10] |
Annelid | Helobdella | 1a (a'), 1b (b'), 1c (c'), 1d (d'), 3a (a'''), 3c (c'''), 3d (dm') 4d (DM'') | None | |
 | Platynereis | 1A, 1B, 1C, 1D | 4d | [12] |
 | Capitella | 2a?, 2c?, 3a, 3b?, 3c, 3d, 4d | none | This report |