General verdicts, special verdicts, and answers to interrogatories shall be in writing. When unanimous they shall be signed by the foreman or forewoman chosen by the jury, and when they are not unanimous, they shall be signed by all jurors concurring therein. They shall be sufficient in form if they express the intent of the jury. They shall be filed with the clerk and be entered of record after being put in form by the court if need be.
Iowa. R. Civ. P. 1.932