Schematic representation of the different degrees of proximity and connection between the adipose and caudal fins in Heptapterini. a. Adipose and caudal fins widely separate, as in Imparfinis piperatus, for instance; b. Adipose fin reaching the caudal fin, but not connecting to it (i.e., connective tissue in which dorsal procurrent caudal-fin rays are imbedded is not contiguous with connective tissue forming the adipose fin), as in Chasmocranus longior, for instance; c. Adipose fin connecting with caudal fin (i.e., connective tissue in which dorsal procurrent caudal-fin rays are imbedded is clearly contiguous with connective tissue forming the adipose fin), as in Heptapterus.