It is a medium- to large-sized freshwater fish, with a robust and elongated body covered by hard bony plates that provide protection against predators. The head is broad and slightly flattened, featuring a ventral sucker-like mouth adapted for adhering to hard substrates. Overall coloration ranges from brownish to grayish tones, often with darker mottling that provides effective camouflage on the river bottom.
Geographic distribution: It occurs in river basins of central and northern Argentina, also extending into neighboring regions of Paraguay and southern Brazil, mainly within the Paraná–Paraguay system. Its distribution is closely linked to well-established and relatively stable freshwater environments.
Habitat: It inhabits rivers, streams, and lagoons with muddy, sandy, or rocky bottoms, usually in areas with slow to moderate current. It favors sites with abundant shelter, such as submerged logs, roots, stones, and riverbanks.
Diet: This species has a primarily detritivorous and algivorous diet, feeding on periphytic algae, biofilm, plant debris, and organic matter accumulated on the substrate. It may occasionally consume small invertebrates as a dietary supplement.
Behavior: It is mostly nocturnal or crepuscular, remaining hidden during daylight hours. The species is territorial, particularly in confined spaces, and uses its sucker mouth both for feeding and for maintaining position against the current.
Reproduction: Reproduction is oviparous and usually coincides with warmer periods and rising water levels. Adults excavate or occupy burrows in riverbanks and soft substrates, where the female lays the eggs, which are guarded by the male until hatching.
Conservation status: It has not been formally evaluated globally or is considered of Least Concern, although local populations may be impacted by pollution, river modification, and habitat loss.
Author of this compilation: EcoRegistros – 15/12/2025