The crayfish, also called crawfish and crawdad, is selected for, and shall be known as, the official invertebrate of the state of Missouri.
Mo. Rev. Stat. § 10.125
Crayfish, official state invertebrate
Effective: 28 Aug 2007; (L. 2007 H.B. 351)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.