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Given the CorydorasWorld CW number of 154 before being described in 2020. Habitat: Known from three localities, two of which are small tributaries of the rio Juína-Mirim west of the city of Juína, near the water divide with the rio Aripuanã (upper rio Madeira basin), and the third one a tributary of the Rio Papagaio below the Cachoeira de Utiariti. All known localities are in the Rio Juruena basin (Rio Tapajós basin), Mato Grosso, Brazil. Lineage: Corydoras rikbaktsa could be assigned to either Lineage 6 or Lineage 9, both of which include short and intermediate short/long snout species. Both lineages share the following combination of features: pectoral spine with weakly to moderately developed serrations (vs. well-developed), perpendicularly or obliquely oriented in relation to main axis of spine (vs. curved or laminar), and directed towards its tip (vs. directed towards its origin); posterior margin of the dorsal spine with serrations directed towards its tip (vs. directed towards its origin); infraorbital 1 generally with poorly to moderately developed ventral laminar expansion (vs. well-developed); and infraorbital 2 generally not contacting compound pterotic (vs. in contact). Currently no morphological diagnosis allowing the assignment of a given Corydoras species to either of these two lineages is available (Lima & Britto, 2020). 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 honours the Rikbaktsa (also known as Rikbakta or Erikbaktsa), a Jê-speaking indian nation, who formerly inhabited the area between the Rio Juruena and Rio Aripuanã in northern Mato Grosso. Their first contacts with the western world happened when they clashed and fought rubber-tappers encroaching on their territories during the 1940´s and 1950´s. They were subsequently contacted by Jesuit priests (and almost completely wiped out by contagious diseases) during the 1960´s. During the 1990´s the Rikbaktsa finally obtained the demarcation of three non-contiguous lands (Hemming, 2003).

CW154

None

Callichthyidae

South America: Brazil, State of Gois, Rio Ituna & Rio Itata, tributaries of the lower Rio Xingu oposite Altamira.

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

23-27°C (73-81°F)

6.0-7.0.

Alexandrou, Markos & Taylor, Martin. (2011). Evolution, ecology and taxonomy of the Corydoradinae revisited.
Lima, Flávio & Britto, Marcelo. (2020). A new Corydoras (Ostariophysi: Siluriformes: Callichthyidae) with an unusual sexual dimorphism from the rio Juruena basin, Brazil. Zootaxa. 4742. 518-530. 10.11646/zootaxa.4742.3.6.
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