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	1:12
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