A vertebral or anatomical structure featuring two wedge-shaped or spherical components, particularly in certain fish or reptile skeletons.
From Greek diplo- (double) and sphaira (sphere), possibly combined with sphen (wedge). The term evolved in paleontology and comparative anatomy to describe paired spherical elements in vertebral columns.
Ancient fish called placoderms had diplosphene vertebrae—double ball-and-socket joints—which gave them incredible flexibility compared to modern fish, and studying these structures helps scientists trace how spines evolved from simple rods into the complex structures we see today!
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