The valves have a diameter ranging from 25 to 40 micrometers. On the valve’s surface, the marginal region displays a pattern of alternating linear costae and striae, with 11-13 costae occurring within 10 micrometers. The central area is circular and calliculate. Marginal fultoportulae are regularly distributed, occurring on every second or third costa. They arise either from the valve’s mantle or from the region near the mantle/valve interface. Internally, each fultaportula has two satellite pores. Externally, the fultaportula opens onto the valve mantle very close to the valve’s edge, without a tubular extension. In the central region, there are 1-8 fultaportulae arranged irregularly on the internally concave portion of the valve. These central fultaportulae typically have three satellite pores. There is a single rimoportula located on one of the costae. Internally, the slit of the rimoportula runs radially; however, some reports indicate a tangentially oriented process. Externally, the rimoportula forms a small pore that is difficult to distinguish from the external openings of adjacent fultaportulae. The external part of the striae features rows of granules that continue into the convex portion of the central region, where they are organized into small clusters. The concave section of the central region consistently lacks granules. Towards the valve margin, the granules become larger and take on a stubby, papilla-like structure. Marginal spines are infrequently observed.