Taxonomy & naming
Several names float around this fish, and only the code is firm. Registry trade names are Broken Line Royal Pleco, Dull eyed Royal Pleco, Green Panque, Grüner Panaque and Panaque cf. suttonorum green. The last is a trade label, not an identification: the Colombian L191 form is considered distinct from Panaque suttonorum, the species of the Lake Maracaibo basin in Venezuela. L191 is a code from the system DATZ began in 1988 for unidentified imports and carries no authority or type specimens. PlanetCatfish lists it as Panaque sp. (L191). The registry's bibliography includes the Welsatlas 2 and the Miniatlas (both 2005), Peter Jäger's article on the "royal" plecos, and magazine items from 2012, 2019 and 2020.
Morphology
The registry gives more than 15.5 in total length, with no measured maximum on record. Diagnostic characters are not recorded, so none are given. The names Green Panque and Grüner Panaque point to green colouring; Broken Line Royal Pleco and Dull eyed Royal Pleco are descriptive trade names whose basis the registry does not explain. Treat all of them as names, not as a description. The registry lists Panaque sp. "Río Ele" as a similar catfish.
Habitat
L191 is recorded from the Río Caguán, Caquetá department, Colombia. The registry enters the river system as the Río Caquetá, which is also called the rio Japurá in Brazil, flowing on to the Amazon. Water type, substrate and cover are not recorded, no fishes are named as found together with L191, and no collecting site more precise than the river is on record.
Feeding
The registry classes L191 as a wood-eater and marks plant matter as eaten. For a Panaque this means driftwood is part of the diet and must stay in the tank for the fish to rasp. Aquarium feeding fits that class: plant-based sinking foods and vegetables beside the wood. Nothing is recorded about what wild fish eat.
Mating
The registry's sexing statement is genus-level: in Panaque, males have a longer, broader head. Cave spawning with male brood care is typical of the genus, but only as a general pattern, since the registry has no cave note for L191 itself. Nothing is on record about courtship or spawning in this particular form.
Breeding
The registry records no aquarium breeding of L191; its breeding status is unknown. Panaque are cave spawners as a rule, with the male guarding eggs and larvae in the cave, but whether this form does so in captivity is not documented, and clutch size, incubation and rearing are all unknown.
In the aquarium
The registry's keeping range is 75–84 °F and pH 6–8, with a recommended tank length of 59 in — aquarium guidance, not field measurements. Small groups are recommended, though a single fish is possible. A large wood-eating Panaque needs clean, well-oxygenated water with current, large pieces of wood and caves.
Conservation
The IUCN Red List has not evaluated L191, because an undescribed form cannot be assessed until it has a name. Since the cf. suttonorum label is only a trade label, the status of the described Panaque suttonorum cannot be transferred to this fish. Nothing specific is on record about its population or threats; in general, collection for the trade and river engineering affect some L-number habitats.