Open circulatory system is present in
Tunicates
Cockroaches
Mosquito
Human
Open Circulatory System -
Blood is pumped out of the heart and the cells and tissues are directly bathed in it.
Eg. In most arthropods, non-cephalopods molluses, tunicates.
Cockroach has open type of circulatory system . It belongs to phylum Arthropoda