XX. 
Monophyletischer Stammbaum des Thierreichs. 
Echinoderma 
(Sternthiere) 
Echinozoa 
Astrozoa (Theco- 
(Antho- stellae) 
stellae) | 
Pelma- 
tozoa 
(Pecto- 
stellae) 
— 
Pentactaea 
Rotatoria 
(Archel- 
minthes) 
Coelomaria 
near : 
Coelenteria } 
Spongiae 
(Schwammthiere) 
Metaspongiae 
Protospongiae 
Ölynthus 
| 
— 
Physemaria 
ee N, N Grenze | 
zwischen Bilateraten 
und Coelenteraten 
Strongylaria 
(Nemathel- | 
minthes) 
—— u 
| Helminthe 
Vertebrata 
(Wirbelthiere) 
Amniota 
Articulata 
(Gliederthiere) 
Tracheata 
| 
Grustacea 
nz 
rt 
Annelida 
Entero- 
pneusta 
(a 
nt 
Nemer- 
Gastro- tina 
tricha 
Anamnia 
Cylostoma 
Acrania 
| 
——— un 
Mollusca 
Cephalopoda 
(Teuthodes) 
Tunicata 
(Mantelthiere) 
Thali- | 
diae | Acephala 
|  (Con- 
,  chades) 
I} 
Ascidiae 
u 
Copelata 
Gastropoda 
(Cochlides) 
Proso- | 
pygia 
(Brachel- 
—minthes) | 
s (Wnrmthiere) 
Platodes 
(Plattenthiere) 
Cestoda 
Trematoda 
Turbellaria 
—— 
e 
Gastraeades 
Gastraea 
Hydrozoa | 
| 
[ Bilaterata 
Coelenterata 
Cnidaria 
(Nesselthiere) 
Seyphozoa 
| 
— nn u 
| 
Hydra 
sÜyemaria 
| 
(Weichthiere) 
I 
