A single terminal bulb, its length more than twice its width, with a terminal projection that may be undeveloped or up to 55% of bulb length. Bulb and projection combined 0.8-2.2% SL. Barbel 67-83% SL, except in the smallest specimen. Axis of stem moderately to fairly dark pigmented proximally, becoming lighter or unpigmented distally. External chevron-shaped or roundish striated areas unpigmented, becoming closely spaced distally. Widely spaced spherical inclusions present in distal 1/3 to 1/2 of stem, sparse or absent before bulb. Middorsal paired spots between occiput and dorsal-fin origin 8, sometimes 9 (Ref. 11333).