S.D. Codified Laws § 47-25-6

Where the members of any merging or consolidating corporation are entitled to vote thereon, the board of directors of such corporation shall adopt a resolution approving the proposed plan and directing that it be submitted to a vote at a meeting of members entitled to vote thereon, which may be either an annual or a special meeting. Written notice setting forth the proposed plan or a summary thereof shall be given to each member entitled to vote at such meeting within the time and in the manner provided in chapter 47-23 for the giving of notice of meetings of members.