c8513c71_segmented_Worms__February_2007__Nematoda
[Phylum] Support [Porifera] Endoskeleton of spicules [Cnidaria] Hydorstatic Skeleton [Platyhelminthes] Absent [Nematoda] 
Hydorstatic Skeleton
Unsegmented Worms: February 2007
Nematoda