Acuminate - tapering to form a spine.
Agglutination - foreign particles bound together by cement into a test.
Aperture - opening of the test. It is standard procedure to figure the specimens aperture up.
Autogenous - a test secreted by the organism.
Frustule - diatom shell.
Fundus - the end of the test opposite the aperture (also called the aboral end).
Idiosomes - agglutinated foreign particles of the test made from other organic material.
Strain - infraspecific morphological variant.
Test - shell, or external hard part, of a protozoan.
Xenogenous test - test composed of agglutinated foreign particles.
Xenosome -agglutinated foreign particles of the test made from mineral grains.