Apionsoma (Apionsoma) trichocephalus Sluiter, 1902: 42–44,

pl. 4, figs 8–11, as Apionsoma trichocephalus; type locality: Philippines, 7°25′ S, 113°16′ E, Siboga expedition, in gray mud. — Cutler et al. 1992: 156, as Apionsoma trichocephala (Gulf of Nicoya, Costa Rica). — Dean 2001: 88 (Gulf of Nicoya, Costa Rica, in sandy mud). Questionable records in the TEP.