coelomocytes
From ZooTerms (Dictionary of Invertebrate Zoology)
2. (Annelida) amoebocytes and elaeocytes.
3. (Echinodermata) The spindle-shaped cells, phagocytes, and crystal cells.
4. (NEMATA) The mesenchymatous cells in the body cavity
See also: pseudocoel cells, pseudocoelomocytes.