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Porca
A porca is a transapical undulation, or elevated ridge, of the external valve face in the genus Surirella. The plural is porcae. In Latin, porca is an agricultural term meaning the ridge between two furrows.
Scanning electron micrograph of the external surface of a species within Surirella. A porca is outlined in white; a total of 2 porcae are visible in the image.
Image Credit: Marina Potapova
SEM of the external surface of Surirella amphioxys. The raised portion of the undulation is a porca. The raised canal (keel) contains the raphe is at the top of the image.