contributor Chris Ralph returns again this month to
spotlight a comparatively new Corydoras species
which was only named 5 years ago in 2003, Corydoras
dyphyes. I now hand you over to Chris.
to the family Callichthyidae or Armoured Catfishes
from South America; namely Paraguay, and is documented
as being restricted to the tributaries of the Río
Monday, Río Acaray, the right bank tributaries
of the Río Paraná and a small stream
at Estancia María Balén. Corydoras
diphyes is also documented as being found in
It is a recently
described species of Corydoras (2003) and
not yet commonly available to the hobbyist. When this
catfish is available expect to pay around £5-£8
(UK) per fish. In its natural habitat Corydoras
diphyes usually occurs in areas which have sandy
substrates with bank vegetation entering the water.
The water in which they are found varies from dark
(stained with tannins) to clear or slightly turbid.
diphyes prefer to
be kept in water which has a pH in the range of 6.0-7.2.
This catfish is ideally suited to temperatures in
the range of 23-26ºC or 73-79°F.
would suggest a minimum tank size of 24” x 15”
X 12” for a small shoal of these fascinating
little catfish. I would suggest good quality aquarium
sand such as BD Aquarium Sand, or very smooth rounded
gravel as the preferred substrate when keeping these
catfish. The aquarium should provide some shelter
in the form of rocks or bogwood along with some aquatic
plants. As with all other species of fish, water quality
and general husbandry is very important, and I would
recommend that a minimum of 25% water is changed on
a weekly to fortnightly basis.
in Lineage 6. This group was always classified under
Corydoras so when a new revision is carried
out a new genus would have to be described alongside
a new type species.
River and Acaray River, Paraná River basin,
Paraguay. Type locality: Paraguay:
Departamento Caaquazú: río Paraná
drainage, small sream (arroyo) at Estancia María
Belén, 8 km from Colonel Patricio Colman, 25º40'13"S,
Male: 4.5cm (1¾ins)
Female: 5.0cm (2ins)
The body shape of Corydoras
diphyes is described as being typical triangular
Corydoras shaped. The body is described as
having relatively low scute numbers with 23-24 in
the dorsal row, 20-21 in the ventral row, and 2-4
pre-adipose scutes. The dorsal head profile is described
as being clearly convex. The caudal fin is described
as being truncate.
The base colour of the body
and head is light tan with a number of darker brown
coloured spots or blotches on the head and along
the length of the body. There are distinct dark
stripes in both the dorsal and caudal fins.
Care & Compatibility
Wherever possible I would
recommend that the aquarist keep these catfish in
a community aquarium in small groups of six or more,
but as the absolute minimum I would suggest three
specimens assuming that they are available in these
numbers. In their natural habitat Corydoras diphyes
would be found in relatively large shoals.
As far as I am
aware there are no documented records of Corydoras
diphyes having been spawned in aquaria to date
(Editors note: This Corydoras
is now being bred in the U.K. (2009) by members of
The males tend to be more slender
than the females. Unlike the majority of other members
of the family Callichthyidae Corydoras diphyes
is documented as not having elongated dorsal and pectoral
fins in either sex.
As with all the other catfish
that I have had the pleasure to keep over the years,
Corydoras diphyes readily accepts a mixed
and varied diet which includes granular foods, frozen
bloodworm and a good quality flake.
Defined as a bony plate. Truncate: Defined as cut off or blunt.
Adipose: Defined as a second dorsal
fin which in the case of Corydoras consists
of fatty tissue with a single spine supporting a thin
membrane. Dorsal: Defined as being top or above.
Ventral: Defined as bottom, below or
skin,(helmeted Doras) cuirass. diphyes: From the Greek
word meaning double nature which refers to the unique
colour patterns observed in this species – spotted
Markos & Taylor, Martin (2011). Evolution,
ecology and taxonomy of the Corydoradinae revisited.
Fuller, I.A.M. & Evers, H-G: 2005 Identifying
Corydoradinae Catfish 384 p