Fig. 5 in Taxonomy and distribution of two small negligible diatoms of Plagiogrammopsis minima and Diploneis aestuarii from Northeast Asian tidal flats

Fig. 5. Scanning electron microscope (SEM) photographs of Diploneis aestuarii: A. External view of the whole valve; B. Arrow indicates central nodule with four areolae. Large Arrowhead indicates central raphe endings which are bent to the opposite direction; C, D. Large arrowhead indicates C-shaped foramen areolae. Arrows indicate terminal raphe endings which are bent to the same direction; E. Internal view of the whole valve; F. Arrow notes central raphe endings; G, H. Large arrowhead indicates rounded perforations of cribrum. Arrows indicate internal terminal fissures.