Original description: Cephalis very small, covered by layer of microgranular silica, with or without converging ridges (pl. 26, 18-19). Horn short, massive, triradiate with three narrow ridges alternating with three wide grooves, grooves about twice as wide as
ridges. Three node-like spines appearing on ridges in middle of horn. Thorax mod erately large, hemispherical in outline, with mixture of large tetragonal, pentagonal, and hexagonal pore frames. Pore frames with rims thick in sides. Pore frames linearly aligned as four to five transverse rows. Feet long, triradiate, with three rounded ridges alternating with three grooves; grooves about as wide as ridges. Aperture large, subtriangle in outline, with latticed velum-like extension when well preserved (pl. 26, figs. 9, 20).
Original remarks: Napora aperta, n. sp., differs from N. sandspitensis Pessagno, Whalen, and Yeh by having a more massive horn, by lacking a spine-like cephalocone on cephalis, and by lacking well-developed transverse ridges on thorax.
Etymology: Apertus-a-um (Latin, adj.) intelligible.