The water vascular system, haemal system and perihaemal system form the tubular coelomic system.
2.
Haemal and perihaemal systems are derived from the coelom and form an open and reduced circulatory system.
3.
The haemal coelom ( or haemal system, the " haemal " being a misnomer ), a perivisceral coelom, a gonadal coelom and often also a perihaemal coelom ( or perihaemal system ).
4.
Echinoderms are an exception having both a coelomic circulatory system ( i . e ., the water vascular system ) and a haemal circulatory system ( i . e ., the haemal and perihaemal systems ).
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