FIGURES 1–19. Microcostatus labrisicus sp. nov. Figs 1–13. Light micrographs of the holotype population, fig. 7 represents the holotype specimen. Figs 14–17. Scanning electron microscopic (SEM) images of external view. Fig. 14. External view of the entire valve. Fig. 15. External detail of the central area and central parts of longitudinal depressions. Figs 16–17. External detail of the distal raphe endings and microcostae. Fig. 18. Internal detail of the central area and proximal raphe endings. Fig. 19. Internal valve view. Scale barrepresents 5 µm (Figs 1–13), 4 µm (Fig. 14), 3 µm (Fig. 19), 1 µm (Figs 15–18).

Published as part of Mateusz, Rybak, Natalia, Kochman-Kędziora & Muzaky, Luthfi Oktiyas, 2022, A new diatom (Bacillariophyta) species from Indonesian urban areas, description of Microcostatus labrisicus sp. nov., pp. 87-94 in Phytotaxa 555 (1) on page 89, DOI: 10.11646/phytotaxa.555.1.6, http://zenodo.org/record/6875691