Shells and anatomical features of Nodularia guiensis sp. nov. A–D. Paratypes: SXNU_24090705 (A); SXNU_24090706 (B); SXNU_24090708 (C); Holotype: SXNU_24090707 (D); E. Anatomical features with the left valve removed. Abbreviations: aam, anterior adductor muscle; pam, posterior adductor muscle; exa, excurrent aperture; ia, incurrent aperture; f, foot; ig, inner gill; og, outer gill; m, mantle; lp, labial palp. F. Labial palps; G. Papillae in apertures. Abbreviations: p ia, papillae in incurrent aperture; p exa, papillae in excurrent aperture.