Catenula boyanensis Luthfi, Witkowski & M.Rybak, sp. nov. A–G light microscopy images H–O SEM images in external view H, M girdle view of frustule showing rectangular with obtuse shape on corners and a row of elongated striae on mantle (M, black arrowhead) I detail of raphe branch J detail of apical part of a frustule with girdle band M the mantle of valve K–L external valve view showing transapical irregular grooves and the central area N open unperforated cingulum O detail of frustule central part. Scale bar: 10 µm (A–G).