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Abstract
Two new pontoniine genera are designated, Pseudopontonia gen. nov., for Pontonia minuta Baker, and Anchiopontonia gen. nov., for Pontonia hurri Holthuis, both genera being presently monospecific. Pontonia minuta is known only from south and eastern Australia, and is of unknown commensal association. Anchiopontonia hurii, an associate of spondylid bivalves, known from the Marshall and Tuamotu Islands, is also newly recorded from the Ryukyu Islands.