Circulatory System :)
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Ricky Fernandez
Echinodermata
Platyhelminthes
Arthropoda
Carl Tondo
Annelida
Nematoda
Mollusca
Michael Tsui
Chordata
Cnidaria
Porifera
The Questions to make Sure you weren't sleeping
The Ascaris
Unfortunately, any of the nematoda do not have a circulatory system at all.
It explains why they mostly consist of parasites.
The Eelworm
The eelworm has no circulatory system at all, similar to the ascaris.
The Threadworm
The threadworm does not have a circulatory system as well, similar to
the other worms mentiond above.