Palaemon (prawn) has an open circulatory system and has jointed legs. Which group does it belong to?
Palaemon (prawn) belongs to the phylum Arthropoda. Arthropods are invertebrate animals with an open circulatory system, paired jointed legs and a chitinous exoskeleton.
Annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels.
Coelenterata lacks a specialized circulatory system.
Platyhelminthes phylum do not contain a body cavity nor a circulatory system.