| On radial canals | |
| On stomach | |
| On stomach and radial canals |
| Crenulated | |
| Elongated | |
| Elongated into tentacles | |
| Folded | |
| None | |
| Pointed | |
| Recurved | |
| Short | |
| Simple |
| Absent | |
| Branching | |
| In 4 groups | |
| In 48 groups | |
| In 8 groups | |
| Solitary |
| 4 lips | |
| 6 lips | |
| 8 lips | |
| Absent | |
| More than 8 lips | |
| Simple and circular | |
| Simple and tubular |
| 1 | |
| 2 | |
| 2 pairs of opposite perradial | |
| 4 perradial and 4 interradial only | |
| 4 perradial only | |
| 8 perradial only | |
| More than 8 | |
| None |
| Above mouth opening and bifurcating | |
| Above mouth opening and simple | |
| Absent | |
| Lips elongated as tentacles |
| Absent | |
| Broad | |
| Conical | |
| Not beyond umbrellar margin | |
| Reaching beyond umbrellar margin | |
| Reaching to about umbrellar margin | |
| Slender | |
| Thick | |
| Very short |
| 12 to 16 regular | |
| 4 | |
| 5 to 18 irregular | |
| 60 or more | |
| 8 | |
| Absent | |
| Bifurcating |