The genus Roeboides is used to group several species of tetras, including the headstanders, scale-eaters, and crystal tetra. These fish, among other characteristics, are small, are typically transluscent, and have a rhomboid shape. Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are oblique. A parallelogram with sides of equal length (equilateral) is a rhombus but not a rhomboid. A parallelogram with right angled corners is a rectangle but not a rhomboid. The term rhomboid is now more often used for a parallelepiped, a solid figure with six faces in which each face is a parallelogram and pairs of opposite faces lie in parallel planes.
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