Serratifera rhombica S.Sato, Chunlian Li & Witkowski Figs 96, 97

Ref. illus.: C. Li et al. 2018, p. 81, figs 431–436

Sample: GU52P-9

Dimensions: Length 8 µm, width 2.7 µm, striae 13 in 10 µm

Diagnostics: Small, rhomboidal (slightly heteropolar). Spines have accessory spines alongside, but these are not clear in our images.