Species Description: Valves of this species are spathulate with a maximum width at about 1/3 the length from the apex (Fig. 1, SEM of entire valve). The antapex is somewhat attenuated and terminated in a radiate series of areolae (Fig. 2, SEM of antapex). There is a rimportula at the antapical end, perpendicular to the narrow sternum (Fig. 2). In girdle view, (not seen) the cells are, as with other Licmophora species, narrowly wedge-shaped (as in Licmophora flabellata Fig. 1), and presumably grow in stalked colonies. The size variation is 12-17 X 3-5µm (Honeywill 1998) or 50-70 X 2.5-7µm (Hustedt 1930-66). The valve in Fig. 1 is 19.3 X 3.7µm. There are 32 striae in 10µm. It is rare in the IRL; this is the only entire valve seen, near the Fort Pierce Inlet. It is widely distributed on the European coast, and has been listed from the U.S. East coast, Biscayne Bay, and Gulf of Mexico.
Honeywill C. 1998. A study of British Licmophora species and a discussion of its morphological features. Diat Res 13: 221-271.
Hustedt F. 1930-1966. Die Kieselalgen Deutschlands, Österreich und der Schweiz. In: Dr. L. Rabenhorst’s Kryptogamen-Flora von Deutschlands, Österreich und der Schweiz 7(1): 1-920, 7(2): 1-845, 7(3): 1-816. J Cramer Verlag, Weinheim.