Grunowago pacifica sp. nov., cont., all GU44BJ-4, except A = SPN2022-1-4 A valve apex showing continuous rim, broken away at lower right, not expanded into a pseudoseptum B frustule at 40° tilt, showing fimbriate inner margin of copula on the hypotheca (top) and line of pores on pars interior (arrow) C valvocopula, showing internal and external aspects, the pars exterior pores (arrow) separated by ridges on the pars interior, and the presence of pores on the pars interior at the pole (arrowhead) D frustule in girdle view with fimbriate pars interior of pleura exposed (arrow) E frustule in polar view tilted 60°, showing girdle bands. Scale bars: 10 µm (A–D); 5 µm (E).