toothplate

plural toothplates

1. An internal structure projecting from the apertural lip of a foraminifer.

   Ventrally the aperture is bordered by an incision, indicating the ventral attachment of the toothplate.

   2015, Vladimir Pokorný, John W. Neale, Principles of Zoological Micropalaeontology, →ISBN

   3 more examples

   So it may be that the digestive protoplasm especially is directed by this row of toothplates. This may be the original meaning of the toothplate. In many more advanced species and genera the toothplate becomes complicated so that its use may be changed.

   1950, Amsterdam Naturalist - Volume 1, page 74

   The majority are multiocular and characteristically the test has a restricted aperture and internal foramina and a toothplate is often present.

   1981, J.R. Haynes, Foraminifera, →ISBN, page 57

   The separation, based on multiple characters, is easy in typical cases, for instance between a high-trochospiral test with a loop-shaped aperture that projects internally as a toothplate (Buliminida) and a low-trochospiral test with a slit-like aperture and no toothplate (Totaliida), but there are many taxa whose placement in one of these two orders (using the 1992 scheme for suprageneric taxa, and the 1987 scheme for genera) appears to be highly subjective.

   2007, Barun K. Sen Gupta, Modern Foraminifera, →ISBN, page 29