Retroculus xinguensis (Xingu Retroculus)

Retroculus xinguensis, or the Xingu Retroculus, is a robust, bottom-dwelling cichlid from Brazil's fast-flowing Xingu River, characterized by its elongated, flattened body, silvery-gray to brownish color with faint bands, and powerful mouth used to sift substrate for invertebrates; it's a rheophilic (current-loving) species demanding high oxygen, strong flow, and rocky/sandy biotopes, exhibiting semi-aggressive behavior and forming dominance hierarchies.