Taxonomy & naming
Corydoras geoffroy was described by Bernard Germain de Lacépède in 1803, and it is the type species of the genus Corydoras — the species, by monotypy, that fixes the name. That gives it a special role in the family's taxonomy: the genus name Corydoras is permanently anchored to this fish, so whatever happens to the rest of the old, sprawling genus, geoffroy and its closest relatives are Corydoras by definition. The specific name honours the French naturalist Étienne Geoffroy Saint-Hilaire (1772–1844).
This matters directly to the 2024 revision of the Corydoradinae by Dias, Tencatt and colleagues. That study showed the historical Corydoras was not a single natural lineage and split it into several genera — Brochis, Hoplisoma, Osteogaster, Gastrodermus and others. But the lineage containing the type species necessarily keeps the name: Corydoras in the strict sense (Corydoras s.s.) is the clade built around C. geoffroy, the long-snouted core of the old genus. So while many familiar 'corys' have been reassigned, the type species itself is unmoved, and corydorasworld.com and FishBase continue to list it as Corydoras geoffroy.
Morphology
Corydoras geoffroy is a long-snouted cory reaching about 3 in in standard length — among the larger members of the strict-sense genus. It has the armoured, deep-bodied, helmet-headed build of the subfamily: two rows of overlapping bony plates down each flank, three pairs of barbels at the downturned mouth, and stiff leading spines in the dorsal, pectoral and adipose fins. As in the genus generally, females grow larger and rounder than males.
The well-developed, conical snout marks it as one of the long-snouted corys — the body plan that typifies Corydoras s.s. as redefined in 2024 — distinguishing it from the blunt-faced short-snouted species reassigned to other genera. Its 'wolf cory' common name nods to that pointed, somewhat predatory-looking profile. The detailed colour and osteological characters are documented in the descriptive and revisionary literature.
Habitat
The species occurs in the coastal rivers of the Guianas — Suriname and French Guiana — on the northern, Atlantic-draining side of South America rather than in the Amazon proper. These are clearwater and tannin-stained coastal drainages flowing off the Guiana Shield.
It is a benthic fish of streams and rivers, living over sand and soft substrate where the long snout can probe the bottom. FishBase characterises it as a tropical freshwater demersal species, with a pH band around 6.0–8.0 and water hardness roughly 2–25 dH; temperatures in the tropical 72–79 °F range suit it. Dedicated field studies are limited, so the aquarium ranges below are best read as practical guidance grounded in those figures.
Feeding
Corydoras geoffroy is a benthic omnivore and detritivore. It forages by sifting soft substrate, burying snout and barbels to taste out small invertebrates, insect larvae, worms and detritus, and expelling cleaned sand through the gills. The long, conical snout is a feeding adaptation that lets it probe more deeply into the streambed than the blunt-faced short-snouted corys — a different microhabitat of the bottom. In the aquarium it accepts sinking foods, frozen bloodworm and brine shrimp, and small live foods.
Mating
Corydoras are egg-laying shoalers with no pair bond and the well-known T-position courtship. A ripe female cleans a spawning site; a male aligns himself at right angles to her head, and the female clasps a few eggs in a basket formed by her pelvic fins and presses them onto the chosen surface, the sequence repeating a few eggs at a time. Behaviour specific to C. geoffroy has not been documented in detail, but the long-snouted corys follow this shared reproductive pattern.
Breeding
No detailed aquarium-spawning account specific to Corydoras geoffroy has been widely published; it is an uncommon fish and not commercially bred. By analogy with related long-snouted corys, breeding would be expected to follow the familiar pattern: adhesive eggs laid in small batches onto cleaned surfaces, often triggered by a cool water change mimicking seasonal rain, with no parental care (adults may eat the eggs), and fry hatching within a few days to take microworm and baby brine shrimp. The specifics for this species remain largely undocumented.
In the aquarium
Despite its taxonomic importance, Corydoras geoffroy is uncommon in the trade and is mainly a fish for collectors and Corydoras specialists. The general genus husbandry applies and matters: keep it as a shoal of six or more, never singly or in pairs, over soft sand so the long snout and barbels are not damaged — substrate quality is especially important for a digging long-snouted species. Provide clean, well-oxygenated water with a gentle current at a comfortable tropical temperature around 72–79 °F and a broad pH range. It is peaceful and suits a calm community, though as one of the larger corys it wants tankmates scaled accordingly. As with all corys, use a cup rather than a net to avoid spine-tangling, and transport carefully, since a stressed fish can release skin toxins dangerous in the confined volume of a bag.
Conservation
Corydoras geoffroy is assessed by the IUCN as Least Concern, evaluated in 2021. The coastal rivers of Suriname and French Guiana that it inhabits remain relatively well-preserved compared with many South American drainages, and the species is not considered to face significant immediate threats. As ever, broad regional pressures — deforestation, mining (including its run-off and mercury contamination), agriculture and pollution — can degrade Guianan freshwater habitats, but as a species geoffroy is currently regarded as being in no danger.