F in A systematic revision of the African catfish genus Parauchenoglanis (Siluriformes: Claroteidae)

F. 2. Scatter diagram of the preorbital head length (PrOL) as a percentage of the head height (HH) against the interorbital distance (IOD) as percentage of the head length (HL) for the specimens from the Nyong, Ntem, San Benito, Ogowe and Kouilou basins. (2) Group with type specimens of P. balayi, P. ballayi var. gravoti and P. guirali; (&) P. pantherinus; (+) P. longiceps; (1) long-snouted Ivindo specimen (see text for details).