Naamgeving
| name | Pea Urchin | 
| Valid name | Echinocyamus pusillus | 
| Synonym | Spatagus pusillus O.F. Müller, 1776 | 
| Synonym | Echinocyamus angulosus Leske, 1778 | 
| Synonym | Echinocyamus minutus Gmelin, 1790 | 
| Synonym | Fibularia tarentina de Lamarck, 1816 | 
| Synonym | Fibularia equina Aradas, 1850 | 
| Synonym | Echinocyamus parthenopaeus Costa, 1869 | 
| Synonym | Echinocyamus speciosus Costa, 1869 | 
Indeling
- 
																
									Echinodermata
								 [phylum]
												
- 
																	
									Echinoidea
								 [class]
												
- 
																	
									Clypeastroidea
								 [order]
												
- 
																	
									Fibulariidae
								 [family]
												
- 
																	
									Echinocyamus 
								 [genus]
												
- Echinocyamus pusillus [species] Pea Urchin
 
 
 - 
																	
									Echinocyamus 
								 [genus]
												
 
 - 
																	
									Fibulariidae
								 [family]
												
 
 - 
																	
									Clypeastroidea
								 [order]
												
 
 - 
																	
									Echinoidea
								 [class]