Caudal fin of Chrysobrycon calamar (A), with details of the hypertrophied caudal-fin squamation on the lower caudal-fin lobe (B). MLP-Ict 11733, male, 35.6 mm SL. Laterodorsal accessory scale: ldas; lateroventral accessory scale: lvas; medial accessory scale: mas; pouch scale: ps; principal caudal-fin ray: pcfr; terminal lateral-line tube: tllt. Specimen stained with Alcian Blue solution. Scale bar: 1 mm.