diff --git a/js/types/ObjectIO.js b/js/types/ObjectIO.js
index ba8ac316..04358f2c 100644
--- a/js/types/ObjectIO.js
+++ b/js/types/ObjectIO.js
@@ -285,84 +285,6 @@ ObjectIO.validator = {
 
 ObjectIO.validateIOType( ObjectIO );
 
-/**
- * Function that creates an IO Type associated with a core type. Methods are forwarded to the core type.
- * @param {function} coreType, e.g., Bunny
- * @param {string} typeName, e.g., BunnyIO
- * @param {Object} [options]
- * @returns {IOType}
- * @public
- */
-ObjectIO.createIOType = ( coreType, typeName, options ) => {
-  assert && assert( typeName.endsWith( PhetioConstants.IO_TYPE_SUFFIX ) || typeName.includes( `${PhetioConstants.IO_TYPE_SUFFIX}<` ), 'IO Type name must end with IO' );
-  options = merge( {
-
-    // The parent IO Type, which will have standard 'class extends' inheritance, and inherit methods, events, etc.
-    // and be shown as a parent type in Studio + API docs
-    parentIOType: ObjectIO,
-
-    // {string} e.g., "Animal that has a genotype (genetic blueprint) and a phenotype (appearance)."
-    documentation: `IO Type for ${typeName.substring( 0, typeName.length - 2 )}`,
-
-    // {Object} - key/value pairs with methods, see PhetioEngineIO for an example
-    methods: {},
-
-    events: [],
-    parameterTypes: []
-  }, options );
-
-  class IOType extends options.parentIOType {
-
-    /**
-     * @param {PhetioObject} phetioObject
-     * @returns {Object}
-     * @public
-     * @override
-     */
-    static toStateObject( phetioObject ) {
-      validate( phetioObject, this.validator );
-      return phetioObject.toStateObject();
-    }
-
-    // @public
-    static fromStateObject( stateObject ) {
-      return coreType.fromStateObject( stateObject );
-    }
-
-    /**
-     * @param {Object} stateObject
-     * @returns {Object[]}
-     * @public
-     * @override
-     */
-    static stateToArgsForConstructor( stateObject ) {
-      return coreType.stateToArgsForConstructor( stateObject );
-    }
-
-    /**
-     * Restores coreType state after instantiation.
-     * @param {PhetioObject} phetioObject
-     * @param {Object} stateObject
-     * @public
-     * @override
-     */
-    static applyState( phetioObject, stateObject ) {
-      validate( phetioObject, this.validator );
-      phetioObject.applyState( stateObject );
-    }
-  }
-
-  IOType.documentation = options.documentation;
-  IOType.validator = { valueType: coreType };
-  IOType.typeName = typeName;
-  IOType.events = options.events;
-  IOType.parameterTypes = options.parameterTypes;
-  IOType.methods = options.methods;
-  ObjectIO.validateIOType( IOType );
-
-  return IOType;
-};
-
 /**
  * Fills in the boilerplate for static fields of an IO Type.
  * @param {function} ioType - an IO Type