@abc.abstractmethod<EOL><INDENT>def get_banks_by_parent_genus_type(self, bank_genus_type):<DEDENT>
return<EOL>
Gets a ``BankList`` corresponding to the given bank genus ``Type`` and include any additional banks with genus types derived from the specified ``Type``.

        In plenary mode, the returned list contains all known banks or
        an error results. Otherwise, the returned list may contain only
        those banks that are accessible through this session.

        :param bank_genus_type: a bank genus type
        :type bank_genus_type: ``osid.type.Type``
        :return: the returned ``Bank`` list
        :rtype: ``osid.assessment.BankList``
        :raise: ``NullArgument`` -- ``bank_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

        *compliance: mandatory -- This method must be implemented.*