Roeboides

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.