Apionsoma (Apionsoma) hespera Chamberlin, 1920 comb. nov.: 31,

as Phascolosoma hespera; type locality: Laguna Beach, California. — Steinbeck & Ricketts 1941: 345, as Phascolosoma hesperum (abundant as commensals of tubes of Cerianthus, Cabo San Lucas, Baja California Sur, Mexico). — Fisher 1952: 393–395, pl. 24, figs 1–5, as Golfingia hespera (Cabo San Lucas and S coast of Santa Rosalía, Baja California Sur, Mexico, inhabiting tubes of Cerianthus). — Brusca 1980: 125–126, as Golfingia hespera (Gulf of California, Mexico). — Amor 1975: 115–116 (Peru). [ Phascolosoma hespera (Chamberlin, 1920) was previously regarded as a synonym of A. (A.) misakianum (Ikeda, 1904): 7–9, pl. 1, fig. 3, pl. 2, figs 30–33, as Phascolosoma misakianum,; type locality: Misaki, Japan.] Reinstatement of name and proposal of a new combination.