Taxonomy & naming
The code L144 comes from the DATZ L-number system, started in 1988 for imported loricariids that could not yet be identified. It is a trade code, not a scientific name, so the form has no describing authority and no type specimens. The L-Wels registry lists it as Ancistrus sp. "L 144" and PlanetCatfish as Ancistrus sp. (L144); no other code is filed under it. The German trade name is Gelber Antennenwels (yellow bristlenose), and the English label is Black eyed yellow bristlenose. The registry's bibliography lists the Welsatlas 2 and Miniatlas L-Welse (both 2005), Klaus Diehl's "Rätselhafte Antennenwelse", an aqualog/terralog news item, Ingo Seidel's article on the aquarium forms of the common brown bristlenose, and a June/July 2018 issue of Aquaristik Fachmagazin.
Morphology
The registry gives about 6 in total length for L144. Its diagnostic characters are not on record; "yellow" and "black-eyed" in the trade names are labels, not a written description. Four similar fishes are listed, all Ancistrus sp. under informal names: Gelb-Schwarzauge, Gold II, Gelb-Schwarzauge-Schleier and Gold I. How L144 is separated from them is not on record.
Habitat
The registry names Paraguay as the country but states that the exact origin is not known; alongside that statement it lists the river system as Río Paraná → Río de la Plata. No collection locality, water type, substrate or other habitat detail is on record. Loricariids of this kind are generally associated with clean, well-oxygenated water and with rock or wood cover — genus-level background, not an observation for L144.
Feeding
The registry's diet class for L144 is predominantly herbivore, and it notes that the form eats aquarium plants, which matters in a planted tank. In the aquarium that points to vegetable-based sinking foods and fresh vegetables. The class applies to the form as a whole; no study of its natural diet has been recorded.
Mating
For sexing, the registry offers a genus-level note: male Ancistrus form more and larger tentacles on the head. Bristlenose catfishes are typically cave spawners, with the male guarding the eggs and larvae, and the registry rates the cave requirement as standard for the genus. Courtship and spawning behaviour of L144 itself are not described.
Breeding
The registry records L144 as bred repeatedly in aquaria, without citing a source or describing the method. Clutch size, spawning site and fry development are not on record. For Ancistrus in general the typical pattern is the male guarding eggs and larvae in a cave, but that is background, not a description of this form's spawnings.
In the aquarium
The registry's keeping range for L144 is 72–81 °F and pH 6.0–8.0, with a tank about 39.5 in long recommended; these are aquarium figures, not field measurements. Small groups are recommended, and a single fish is possible. Clean, well-oxygenated water and caves of rock or wood are the basics, as with other bristlenose catfishes, and territorial behaviour toward other plecos is common. Because the registry notes that it eats aquarium plants, tender species in a planted tank may be nibbled.
Conservation
L144 has not been assessed by the IUCN Red List and is Not Evaluated, since an undescribed form cannot be assessed until it has a name. The origin is recorded only at country level, so no specific threats can be tied to this form. In general, collection for the trade and river engineering affect some L-number habitats.