tta. \______ | ______/ | | |
| e | | | | \|/ | . d |
| | | | | | | a n |
| y | | | | Nematoda. Himatega. | i a |
| b | | | | | | | r |
| | | | | | | | a d |
| | | | | | | | t o |
| | \______________|______|_ __|____________|_____/ | a o |
| | \/ | m l |
| | | ae b |
| | _Coelomati_ | H |
| | (worms with body-cavity}. | | h |
| | \ / | t |
| | \ / | i |
| | \ / | W |
| |________________________________\/_____________________|______|
| . | | | |
| ) d | | | . |
| s e | _Zoophyta_ | Plathelminthes. | m |
| l n | (Coe;enterata). | | | o |
| a i | | | | l |
| m l | Acalephae. \______________ |_____/| e |
| i | | \/ | o |
| n , | Spongiae. | _Acoelomi_ | c |
| a t | | | (Worms without | |
| u | Archispongia. Archydra. body cavity). | o |
| t g | | | | | n |
| u | | | | | |
| G e | \______ ______/ | | | d |
| ( u | \/ | | a n |
| r | Protascus. Prothelmis. | i a |
| t | | | | r |
| | | | | a d |
| A | Gastraea radialis Gastraes bilateralis | ae o |
| | | (sedens).