f99a56df_Intertabrae_Chart__7
[0] Nematoda [1] None [2] None [3] Mouth,intestine, anus [4] Separate sexes [5] excretory tubules and excretory pore [6] Circular brain and several longitudinal nerve cords [8] Longitudinal muscles [7] 
None
S k e l e t a l
S p i c u l e s
N o n e
S o m e c o n t a i n s h e l l s
E x o s k e l e t o n m a d e o f c h i t i n
Intertabrae Chart
7