Tramitichromis variabilis is believed to include individuals with two distinct melanic color patterns, as shown in the above drawing from Trewavas' (1931) early monograph of Lethrinops. Scroll down for her drawing of the lower pharyngeal bones of this species and of T. brevis (type species of Tramitichromis).
The peculiar modifications of the broadened anterior dentigerous surface and the steeply
descending anterior blade of the pharyngeal bone constitute the current basis for
definition of the genus. These specializations were believed by Eccles & Trewavas (1989)
to outweigh the diversity of color pattern types represented in the referred
species (every species in the genus has a different color pattern!) which would have to
represent multiple character reversals for unknown reasons if they are correct.
|Last Update: 18 November 1999
Web Author: M. K. Oliver, Ph.D.
Copyright © 1997-2018 by M. K. Oliver - ALL RIGHTS RESERVED