Metamysidopsis frankfiersi (Crustacea: Mysidae) is the intermediate host of Rhadinorhynchus trachinoti (Acanthocephala: Rhadinorhynchidae) on the coast of Mazatlán, Sinaloa. Journal Ciencias del Mar UAS, v. 2, n. 2, p. 136–143, 27 Mar.2025.