Symmetric Solid Shapes

(Adapted from Taxon, 1962)

Length:Width

12:1

6:1

3:1

2:1

3:2

6:5

1:1

5:6

2:3

1:2

1:3

1:6

1:12

Ellipsoid
With widest axis at midpoint of structure and with margins symmetrically curved

narrowly ellipsoid

ellipsoid

broadly ellipsoid

spheroid

obloid


transversely ellipsoid


lenticular

Oblong
With widest axis at midpoint of structure and with margins essentially parallel

cylindric or terete


narrowly oblong or ovoid


oblong

broadly oblong

cubical

transversely broadly oblong


transversely oblong


narrowly transversely oblong

transversely cylindrical or terete

Ovoid
With widest axis below middle and with margins symmetrically curved; egg-shaped

lanceoloid

ovoid

broadly ovoid

very broadly ovoid

broadly depressed ovoid

depressed ovoid

Obovoid
Inversely ovoid

oblanceoloid

obovoid

broadly obovoid

very broadly obovoid

broadly depressed obovoid

depressed obovoid

Rhomboid
With widest axis at midpoint of structure, and with straight margins; elliptic but margins straight and middle angled

narrowly rhomboid

rhomboid

broadly rhomboid

quadrate rhomboid

broadly transversely rhomboid

transversely rhomboid

narrowly transversely rhomboid

Trulloid
With widest axis below middle and with straight margins; ovate but margins straight and angled below middle, trowel-shaped

narrowly trulloid

trulloid

broadly trulloid

very broadly trulloid

broadly depressed trulloid

transversely depressed trulloid

Obtrulloid
Inversely trulloid

narrowly obtrulloid

obtrulloid

broadly obtrulloid

very broadly obtrulloid

broadly depressed obtrulloid

transversely depressed obtrulloid

Triangular
With three sides and three angles

subulate

narrowly pyramidal

triangular

broadly deltoid

deltoid

shallowly deltoid

shallowly pyramidal

very shallowly pyramidal

Obtriangular
Inversely triangular

linear obpyramidal or narrowly cuneiform

cuneiform

obpyramidal or broadly cuneiform

broadly obdeltoid

obdeltoid

shallowly obdeloid

shallowly obpyramidal

very shallowly obpyramidal