Guiana Shield
"L. villosus" originates from the Essequibo River drainage of the Guiana Shield. An undescribed species of "Lithogenes" is known from the Orinoco basin of the Guiana Shield. "L. valencia" has only been known from six specimens collected in the 1970s from tributaries of the Lake Valencia in northern Venezuela; however, this area has since been polluted and this species possibly is now extinct.