FIG. 10 in A study of the morphology and distribution of four Achnanthidium Kütz. species (Bacillariophyta), implications for ecological status assessment, and description of two new European species

FIG. 10. — Achnanthidium neomicrocephalum Lange-Bert. & F.Staab, specimens from Lustsee, Germany: A-H, SEM views of raphe valves; A-C, SEM external views of raphe valves; D, SEM internal view of raphe valve; E, SEM external view of valve centre; F, SEM external view of half of valve and pole; G, SEM internal view of valve centre; H, SEM internal view of valve pole. Scale bars: A, B, D, 5 µm; C, 10 µm; E-H, 1 µm.