armatum, Pycnocraspedum Gosline [W. A.] 1954:80, Figs. 2e, 3e [Pacific Science v. 8 (no. 1); ref. 1860] Off the Mauna Loa lava flow, Hawaii Island, Hawaiian Islands. Holotype (unique): USNM 162717. •Valid as Pycnocraspedum armatum Gosline 1954 -- (Nielsen & Cohen in Nielsen et al. 1999:87 [ref. 24448], Mundy 2005:245 [ref. 28379], Prokofiev 2005:118 [ref. 34466], Evseenko & Okiyama 2006:195 [ref. 28760], Prokofiev 2022:684 [1023] [ref. 40458], Girard et al. 2023:[3] [ref. 40172], Schwarzhans et al. 2025:455 [ref. 42145]). Current status: Valid as Pycnocraspedum armatum Gosline 1954. Ophidiidae: Neobythitinae. Distribution: Western-central Pacific: from Japan to Hawaiian Islands (U.S.A.), southward to New Caledonia. Habitat: marine.