The common name of 'False Arched
Cory' is due to its likeness (mimicking) to Corydoras
is now CW036 and the true Corydoras arcuatus,
instead of the shorter nosed C020. The habit of shoaling
with Corydoras species probably stems from
the protection of this scaleless catfish from large
predators due to the plated Corydoras where
predators are wary of the locked pectoral and dorsal
spines. There is the other scenario that states that
the Brachyrhamdia are practising a Batesian
form of shoaling whereas they take food that the Corydoras
dig up from the substrate and also they steal the
eggs of these species. Aquarium Care:
House in aquaria (24ins/60cm or over) with alternate
sand and gravel substrate. Provide planted area. Keep
in a species tank or with Corydoras and larger
Characins or Anabantoides in the top half as they
can be predatory with small species such as Neon Tetras.
Diet: Tablet and pellet foods. Frozen
and live foods such as bloodworm. Insect larvae. Not
a fussy eater. Remarks: This species
is so new (2013) that it is not yet listed in Fishbase
but is documented in the Catalog of Fishes. The new
species appears to have a mimetic association with
the syntopic callichthyid Corydoras arcuatus.
Herein, we argue in favour of the hypothesis that
the interaction between species of Brachyrhamdia
and Pimelodella or Corydoras is
Müllerian mimicry. (Slobodian, V. and F. A. Bockmann
False Arched Cory
Rio Japurá, a left margin tributary of the
Rio Solimões, Amazonas basin, Brazil.
Slobodian, V. and F.
2013 (26 Sept.) A new Brachyrhamdia (Siluriformes:
Heptapteridae) from Rio Japurá basin, Brazil,
with comments on its phylogenetic affinities, biogeography
and mimicry in the genus. Zootaxa 3717 (no. 1): 1-22. Eschmeyer's Catalog of Fishes 2020.
Valid as Brachyrhamdia thayeria Slobodian & Bockmann
2013. Heptapteridae. Distribution: Amazon River basin:
Brazil and Colombia. Habitat: freshwater.