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Yellow sandshell (Lampsilis teres) uses gar (Lepisosteus) as host. The ribbed structure is one of the two marsupial gills, protruded between the two mantle flaps. The internal space of the gill is divided into segments called water tubes by partitions called lamellae. each water tube is filled with glochidia. Ability to protrude the marsupial gill into "harm's way", so that it can be ruptured by the host fish, is a key adaptation in the lampsiline strategy. The mantle flaps of yellow sandshell are not very fishlike, but they move vigorously to attract the predatory host..