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Like all the orange-blotched Corydoras from the upper Rio Negro drainage, Gastrodermus nijsseni is very  variable in the black parts of the colour pattern. There are forms with broad and forms with very narrow  stripes, depending on the locality. The other orange spotted species which are syntopic with Gastrodermus nijsseni mostly show the same variation. The form with a very broad band (only in males), has been erroneously given the C-number C111. Lineage:Part of the so called "Elegans Group" which would place it in Lineage 5. A revision in the future could involve the resurrection of the genus name Gastrodermus (Cope, 1878), with the designated type species: C. elegans. As of the latest update Corydoras nijsseni has now been placed in Lineage 5 and has the new genus name of Gastrodermus (2024). Aquarium Care: This is akin to most of this genus, very peaceful, and would be best housed with small to medium sized tankmates such as Tetras, Rasboras and Danios or in a species tank for breeding purposes. Best to purchase 6 individuals or more as they will be happier in a group. Diet: Readily accepts a mixed and varied diet which includes granular foods, tablet food, frozen bloodworm and a good quality flake. Etymology: The specific name nijsseni: Named in honour of Dr. Han Nijssen. Remarks: Still found on some online sources as Corydoras nijsseni.

C111

Corydoras nijsseni

Callichthyidae

South America: Brazil, Main whitewater tributaries of the Rio Negro and upriver from Sao  Gabriel da Cachoeira.

Male: 4.5cm (1¾ins) Female: 5.0cm (2ins)

23-27°C (73-81°F)

6.0-7.2.