Symmetric Plane Figures

(Adapted from Taxon, 1962)

Length:Width 12:16:13:12:13:26:51:15:62:31:21:31:61:12
Elliptic
With widest axis at midpoint of structure and with margins symmetrically curved
 
narrowly elliptic
elliptic
widely elliptic
circular
oblate
transversely elliptic
narrowly transversely elliptic
 
Oblong
With widest axis at midpoint of structure and with margins essentially parallel
linear
narrowly oblong or ovate
oblong
widely oblong
square
transversely widely oblong
transversely oblong
narrowly transversely oblong
transversely linear
Ovate
With widest axis below middle and with margins symmetrically curved; egg-shaped
 
lanceolate
ovate
widely ovate
very widely ovate
widely depressed ovate
depressed ovate
     
Obovate
Inversely ovate
 
oblanceolate
obovate
widely obovate
very widely obovate
widely depressed obovate
depressed obovate
     
Rhombic
With widest axis at midpoint of structure, and with straight margins; elliptic but margins straight and middle angled
 
narrowly rhombic
rhombic
widely rhombic
quadrate rhombic
widely transversely rhombic
transversely rhombic
narrowly transversely rhombic
 
Trullate
With widest axis below middle and with straight margins; ovate but margins straight and angled below middle, trowel-shaped
 
narrowly trullate
trullate
widely trullate
very widely trullate
widely depressed trullate
transversely depressed trullate
     
Obtrullate
Inversely trullate
 
narrowly obtrullate
obtrullate
widely obtrullate
very widely obtrullate
widely depressed obtrullate
transversely depressed obtrullate
     
Triangular
With three sides and three angles
linear triangular
narrowly triangular
triangular
widely deltate
deltate
shallowly deltate
shallowly triangular
very shallowly triangular
 
Obtriangular
Inversely triangular
linear obtriangular or narrowly cuneate
cuneate
obtriangular or widely cuneate
widely obdeltate
obdeltate
shallowly obdeltate
shallowly obtriangular
very shallowly obtriangular
 

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