Comments

D. Internal SEM of valve mantle. Three marginal strutted processes are visible on the valve mantle. The marginal strutted processes have three accessory pores located around the primary pore. A central strutted process is visible on the valve face. The structure of the central strutted processes is similar to the marginal strutted processes. Both the marginal strutted processes and the central strutted processes have an accessory pore cowling that covers each accessory pore and fuses to the primary pore. A labiate process is visible at the valve face/ mantle junction. The labiate processes are raised on a short stalk. Scale bar equals one micron.

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