Hemiancistrus

L106, Hemiancistrus guahiborum, is a suckermouth catfish known only from the Rio Orinoco drainage in Venezuela. Also known as the spotted orange seam plec, it lives amongst rocks in flowing water and needs well-oxygenated water with some current. Described in 2005, it may be the same species as the undescribed L122, although the flatter profile of L122 suggests the two are distinct.

The blue phantom plec (L128) is a suckermouth catfish known only from the northern Rio Orinoco drainage in Venezuela. Its identity is unresolved. It closely resembles Hemiancistrus subviridis, the green phantom plec (L200), and the colour of the two grades from one into the other along the same river system, suggesting colour forms of one species, but this awaits scientific confirmation. Newly imported fish can be delicate, and emaciated fish with sunken eyes do not often survive for long.

Hemiancistrus subviridis is a suckermouth catfish from the upper Orinoco and Casiquiare drainages in southern Venezuela, where it lives in cracks between granite rocks in flowing water. Known in the hobby as the green phantom plec, it shares the code L200 with Baryancistrus demantoides. Only B. demantoides has a membrane joining its dorsal and adipose fins. It looks very like L128, the blue phantom plec, and along the Orinoco the two fish grade into each other in colour.