The quality or condition of having distinct and specialized dorsal and ventral surfaces.
From dorsiventral + -ity (noun-forming suffix). The suffix -ity converts the adjective into an abstract noun indicating a property or condition. Emerged in evolutionary biology literature.
Dorsiventrality is why a fish looks completely different from top to bottom—the top is streamlined and dark to hide from predators above, while the belly is pale and soft because it doesn't need the same armor!
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