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Hoplisoma punctatus, also known as Corydoras punctatus, is a small South American catfish valued for its understated appearance and lively behavior. This species spends much of its time near the substrate, exploring the sand with its barbels while searching for food. Its body, covered with bony plates, and its spotted pattern give it the typical appearance of a corydoras. Generally common in the aquarium hobby, it is suitable for a peaceful community aquarium. When kept in a group, it becomes more active and displays more natural behavior, including bottom foraging and occasional trips to the surface.

General description of the species

Hoplisoma punctatus is a small schooling callichthyid that mainly lives near the bottom, although it uses the full height of the aquarium when comfortable. It should be kept in a group of at least six individuals, as the presence of companions encourages more natural and confident behavior. Its activity alternates between exploring the substrate, resting beneath plants, and making brief trips to the surface. Like other corydoras, it can use intestinal respiration to gulp atmospheric air; this is normal, but it does not replace well-oxygenated water. A mature, stable aquarium with fine, smooth sand is especially suitable. Its peaceful temperament allows it to live with small, calm fish that share similar water conditions.

Geographical origin and biotope

Hoplisoma punctatus comes from northeastern South America, particularly the Suriname basin and nearby areas of the Guiana Shield. Reference countries: Suriname, Guyana, and French Guiana are associated with its range. It inhabits calm or moderately flowing sections of small streams, flooded margins, and forested areas where sand, fine silt, and plant debris collect on the bottom. The water may be amber when leaves release tannins, although the species can also occur in clearer water. Riparian vegetation provides shade and shelter. In an aquarium, moderate lighting, dense plants, and a few roots recreate this humid forest understory setting effectively.

Precise location and local name

The historical locality of Hoplisoma punctatus is associated with Suriname, in the Suriname River area and its tributaries. Its distribution also reaches neighboring Guianan basins, which explains why geographic references may vary among taxonomic sources and commercial shipments. The most commonly used English vernacular name is Spotted cory. In the aquarium trade, the former name Corydoras punctatus remains widespread and is still commonly used by hobbyists to identify the species. Since several corydoras have a spotted appearance, careful identification is useful before combining populations from different regions.

Appearance and physical characteristics

The body of Hoplisoma punctatus is stout, relatively low, and protected by two rows of lateral bony plates. Its background color ranges from beige to light brown and carries numerous irregular dark spots, which explain its common name. The downward-facing mouth is surrounded by sensitive barbels used to detect food particles in the substrate. The fins are translucent to slightly grayish; the dorsal fin may show darker markings. As in other members of its family, the first rays of the pectoral fins are reinforced and can prick during handling. A soft net and a container are therefore preferable to a bare hand. Its adult size remains modest, making it suitable for small to medium-sized community aquariums.

General diet

Hoplisoma punctatus is a benthic omnivore that searches for small prey, larvae, worms, tiny crustaceans, and plant matter deposited on the bottom. In aquaria, its diet should be based on quality sinking pellets, supplemented with frozen or live foods such as bloodworms, daphnia, and brine shrimp. Feed after the lights are partly dimmed or distribute food in several areas so each fish can eat without excessive competition. It does not mainly feed on other fishes’ waste and should not be considered a clean-up crew. A clean but not sterile substrate allows it to forage without damaging its barbels. A varied, regular diet supports body condition and group behavior.

Essential data

• River of origin: Suriname River
• Local name used: Spotted cory
• Origin of the scientific name: Hoplisoma is the current genus name; punctatus is the specific epithet.
• Meaning of the full name: Hoplisoma comes from the Greek hoplon, weapon or shield, and soma, body; punctatus means spotted or marked with points.
• Common/vernacular names: Corydoras punctatus, spotted cory, Spotted cory
• Family: Callichthyidae
• Subfamily: Corydoradinae
• Name pronunciation: hop-li-SO-ma punk-TA-tus
• Discovery: Marcus Elieser Bloch, 1794
• Maximum adult size: approximately 5 cm
• Water temperature and pH: 22 to 26 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: small slow to moderately flowing streams, sandy or muddy bottoms, leaf litter, roots, and dense forest vegetation
• Typical tankmates: Paracheirodon axelrodi, Hyphessobrycon amandae, Otocinclus affinis, Hoplisoma paleatus, Apistogramma borelli, Brochis splendens
• Temperament and behavior: very peaceful and social, active mainly near the bottom; it sifts through the substrate and sometimes makes quick trips to the surface.
• Water depth: shallow to intermediate sections of streams
• Sexual dimorphism: females are generally broader and more robust; the difference is most visible in mature fish viewed from above.
• Bottom structure and flow: fine sand, silt, and leaf litter; slow to moderate flow.

In your aquarium

To keep Hoplisoma punctatus successfully, provide a proper group, soft sand, efficient filtration, and stable water conditions. Substrate quality is especially important for protecting the barbels. Offer shaded areas, plants, and a varied sinking diet. Avoid boisterous or predatory tankmates, as well as sharp gravel. Regular maintenance and moderate water changes will help this peaceful fish remain active and express its natural behavior fully.