Diagnostic Description
provided by Fishbase
Readily distinguished from the other two species of the genus by having more branched rays on the anal fin (43-47, versus 41-43 in R. ogilviei and 38-41 in R. itupiranga). Hooks are present on the anal fin of adult male specimens of R. itupiranga and in one adult male of R. ogilviei but have not been found in males of R. molossus of comparable sizes.
Morphology
provided by Fishbase
Dorsal soft rays (total): 11; Analspines: 4 - 5; Analsoft rays: 43 - 47; Vertebrae: 40
