Rhomboides

Rhomboides refers to a genus of freshwater fish belonging to the family Characidae, commonly known as tetras. These small, schooling fish are native to South America, inhabiting various river basins. The most well-known species within this genus is likely the Serpae tetra (Hyphessobrycon eques), though the term "rhomboides" itself can also be used more broadly in relation to fish with a diamond or rhomboid shape, particularly when describing the body outline.

Fish within the genus Rhomboides are characterized by their relatively small size, typically reaching a few inches in length. They possess a generally compact and laterally compressed body, contributing to their rhomboid appearance. Coloration varies by species, but many exhibit vibrant hues, often including reds, oranges, and metallic sheens. They are omnivorous and feed on small invertebrates, insects, and plant matter in their natural habitat. In aquariums, they are known for their active nature and are often kept in community tanks. Their schooling behavior makes them visually striking when kept in groups. The term rhomboides, when used in a more descriptive context rather than strictly taxonomic, highlights this characteristic body shape that is common among many small characin species.