Symmetry abounds in nature, often in its most beautiful forms. A perfect snowflake, a blooming sunflower, a light-harvesting complex from a bacterium—they all exhibit striking symmetry, crafted by ...

Of the four symmetry classes of conodont element-pairs recognized herein, two involve asymmetry. Asymmetry in the conodont-bearing organism need not preclude the concept of a nektonic mode of life, ...