![]() ![]() However, the taxon also exhibits unique features that justify its separation at the species level from any currently known taxon within Fragilariforma: 1) the spines are subtended by a siliceous ring having short extensions projecting onto the valve face, 2) there is a portula lacking a labiate internal structure, and 3) the girdle bands lack perforations. spines on the costae at the valve face/mantle junction, a portula along a stria, developed apical pore fields, and ligulate, open girdle bands. Williams & Round such as uniseriate striae recessed between thickened costae, simple round areolae. Light (LM) and scanning electron microscopy (SEM) data reveal that the taxon has several features congruent with taxa currently placed in Fragilariforma D. ![]() Morales, Manoylov & Bahls, is described from rivers in the northern United States of America. A new taxon, namely Fragilariforma horstii E. ![]()
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