old favourite in the hobby for many years for our
Cory buffs is our factsheet of the month for March
2015, C. napoensis. It is quite similar to
nanus and also. Males
of C. napoensis usually have a black blotch
to the dorsal fin and the females do not, as they
sport a more or less clear dorsal fin, sometimes with
a hint of a blotch. There are of course exceptions
to this rule as this species is quite variable in
colouration and markings. It is a member of the so
called "elegans" group which include C.
nanus and C.
elegans along with
around another 22 species. They all have this basic
short and compacted head shape and sexual dimorphism,
in most of these species this is the norm.
If there is any
work carried out on this group in the future there
is a very good chance that the genus name would revert
back to Gastrodermus Cope, 1878. The two
images show the sexual dimophism in this species and
the vast majority of the "elegans" group.
Corydoras napoensis is 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.
Amazon River basin, eastern Ecuador and Peru. Type
locality: Napo, Lagartococha, affluent septentrional
du Rio Aguarico, entre l’embouchure de la rivière
(0º39'S, 75º16'W) et le village de Garzacocha
(0º28'S, 75º21'W), bassin du Rio Napo, Ecuador.
Male: 4.5cm (1¾ins)
Female: 5.0cm (2ins)
Head: short and compact.
Light brown body colour. Dorsal
fin in male with a black blotch, females more or less
clear dorsal fin, sometimes with a hint of a blotch.
Fins are colourless with sometimes a hint of yellow
in good condition. Body pattern consists of three
dark bands which extend from the head to the caudal
peduncle. The head has a mottled pattern which extends
over the top half of the body.
Care & Compatibility
Can be kept with a vast variety
of peaceful fish but would suffer with large Cichlids.
This is akin to most of this genus, very peaceful,
and would be best housed with small to medium tank
mates such as Tetras, Rasboras and Danios or
in a species tank for breeding purposes. This
is akin to most of this genus, very peaceful, and
would be best housed with small to medium tank mates
such as Tetras, Rasboras and Danios or
in a species tank for breeding purposes.
Dorsal fin in male with a black
blotch, females more or less clear dorsal fin, sometimes
with a hint of a blotch. Males are usually more colourful.
Has been bred in the hobby
and they spawn in the same Corydoras pattern
which you can read about in the many articles in the
Breeding Articles section here.
A good quality flake food and
tablet food for adults with sporadic feedings of frozen
or live food will keep your Corydoras in
The primary rayed fin(s)
on top of the body. Caudal peduncle:
The area between the dorsal
fin and the tail. Dimorphism: The
morphological variations of one species.
= helmeted; doras = leathery skin, (helmeted Doras)
cuirass. napoensis: Named after Napo,
one of the regions from which it was collected.
Markos & Taylor, Martin. (2011). Evolution,
ecology and taxonomy of the Corydoradinae revisited.
Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
1418:1-628. Ian A. M. Fuller & Hans-Georg Evers
2011, Identifying Corydoradinae Catfish: Aspidoras-Brochis-Corydoras-Scleromystax-C-numbers
& CW-numbers 141p. Ian Fuller Enterprises. Seus, Werner:
Corydoras, The most Popular armoured catfishes of
South America. www.corydorasworld.com