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They are similar to Gastrodermus pygmaes, another dwarf Cory, but the black diamond shape in the caudal peduncle and into the tail of hastatus, with the top and bottom of this diamond ringed with white, tells them apart as pygmaes sports a black band that runs the full length of the body, ending just short of the tail end, and ending in a slightly broader band. Lineage: Corydoras hastatus is placed in Lineage 4 which includes two of the dwarf species and a revison would be a resurrection of the disused Microcorydoras (Myers, 1953) with the designated type species: C. hastatus. As of the latest update Corydoras hastatus is now been placed in Lineage 5 and has the new genus name of Gastrodermus (2024). Aquarium Care: A very small “mid-water shoaling” Cory in that it doesn't spend as much time on the substrate as other Corydoras/Gastrodermus do, and seems to prefer to sit on the leaves of aquarium plants rather than sitting on the bottom. As mentioned you should house these dwarf Cory's with each other in a shoal with about about 1 dozen being a nice number in a species tank, as these small Corydoras/Gastrodermus will not do well in a community tank with robust tankmates unless they are housed with small unagressive Characins. Diet: Smaller foods for this Gastrodermus such as crushed flake, tablets, grindal worm and washed brine shrimp. Small frozen bloodworm is also a good food. Etymology: The specific name hastatus: Spear-shaped, (referring to the spot). Remarks: This is the smallest Gastrodermus to date and the females usually are a bit bigger than the males. Remarks: Still found on some online sources as Corydoras hastatus.

Dwarf Corydoras

Corydoras australe, Corydoras hastatus

Callichthyidae

South America: Brazil, Amazonas Villa Bella= Parintins (02º38'S, 56º45'W).

Male: 2.5cm. (1ins ) Female: 3.0cm (1¼ins)

23-27°C (73-81°F)

6.0-7.2.

Alexandrou, Markos & Taylor, Martin. (2011). Evolution, ecology and taxonomy of the Corydoradinae revisited.
Angelica C Dias, Luiz F C Tencatt, Fabio F Roxo, Gabriel de Souza da Costa Silva, Sérgio A Santos, Marcelo R Britto, Martin I Taylor, Claudio Oliveira, Phylogenomic analyses in the complex Neotropical subfamily Corydoradinae (Siluriformes: Callichthyidae) with a new classification based on morphological and molecular data, Zoological Journal of the Linnean Society, 2024;, zlae053.
ScotCat Factsheet no. 32. Feb. 1999.