Ellipsoid
With widest axis at midpoint of structure and with margins symmetrically curved |
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| narrowly ellipsoid |
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| ellipsoid |
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| broadly ellipsoid |
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| spheroid |
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| obloid |
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| transversely ellipsoid |
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| lenticular |
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Oblong
With widest axis at midpoint of structure and with margins essentially parallel |
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| cylindric or terete |
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| narrowly oblong or ovoid |
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| oblong |
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| broadly oblong |
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| cubical |
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| transversely broadly oblong |
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| transversely oblong |
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| narrowly transversely oblong |
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| transversely cylindrical or terete |
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Ovoid
With widest axis below middle and with margins symmetrically curved; egg-shaped |
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| lanceoloid |
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| ovoid |
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| broadly ovoid |
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| very broadly ovoid |
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| broadly depressed ovoid |
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| depressed ovoid |
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Obovoid
Inversely ovoid |
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| oblanceoloid |
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| obovoid |
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| broadly obovoid |
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| very broadly obovoid |
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| broadly depressed obovoid |
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| depressed obovoid |
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Rhomboid
With widest axis at midpoint of structure, and with straight margins; elliptic but margins straight and middle angled |
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| narrowly rhomboid |
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| rhomboid |
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| broadly rhomboid |
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| quadrate rhomboid |
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| broadly transversely rhomboid |
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| transversely rhomboid |
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| narrowly transversely rhomboid |
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Trulloid
With widest axis below middle and with straight margins; ovate but margins straight and angled below middle, trowel-shaped |
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| narrowly trulloid |
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| trulloid |
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| broadly trulloid |
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| very broadly trulloid |
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| broadly depressed trulloid |
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| transversely depressed trulloid |
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Obtrulloid
Inversely trulloid |
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| narrowly obtrulloid |
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| obtrulloid |
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| broadly obtrulloid |
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| very broadly obtrulloid |
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| broadly depressed obtrulloid |
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| transversely depressed obtrulloid |
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Triangular
With three sides and three angles |
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| subulate |
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| narrowly pyramidal |
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| triangular |
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| broadly deltoid |
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| deltoid |
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| shallowly deltoid |
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| shallowly pyramidal |
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| very shallowly pyramidal |
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Obtriangular
Inversely triangular |
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| linear obpyramidal or narrowly cuneiform |
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| cuneiform |
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| obpyramidal or broadly cuneiform |
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| broadly obdeltoid |
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| obdeltoid |
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| shallowly obdeloid |
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| shallowly obpyramidal |
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| very shallowly obpyramidal |
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