c8513c71_segmented_Worms__February_2007__Nematoda
[Phylum] Nervous System [Porifera] Absent [Cnidaria] Nerve Net [Platyhelminthes] Head ganglia with longitudial nerve cords [Nematoda] 
Head ganglia with dorsal and ventral nerve cords
Unsegmented Worms: February 2007
Nematoda