Two terminal bulbs separated by a long interspace (usually 2-3 times length of distal bulb, but up to 7.5 times in some small specimens). Barbel 60-85% SL in over 10 cm specimens. Terminal filament long, rarely with 1 or 2 short branches. Distal bulb usually 1-1.6 times length of proximal bulb (0.5-2 times in small specimens). Axis of stem pigmented, usually dark. External chevron-shaped or striated areas on stem usually pigmented in specimens larger than 8 cm. Paired dorsal spots between occiput and dorsal-fin origin usually 9, sometimes 7 (Ref. 11333).