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FACTSHEETS: August 1997- no. 014

Hoplisoma oiapoquense Nijssen, 1972


his cory is like a
Corydoras panda look-alike, the difference being is that Hoplisoma oiapoquense (note the genus and specific name changes...see further below*) has the caudal peduncle spot on the base of the caudal fin, plus the tail has about 3 bands whereas C. panda has a clear tail. Apart from that they are very much alike, but I have found H. oiapoquense to be a very shy fish, hence the quick and not so great photo here, as the fish appeared instead of waiting for it to come nearer, you can still see the main characteristics in the image.

 

Hoplisoma oiapoquense

Hoplisoma oiapoquense - Lineage 9

 

Hoplisoma oiapoquense occurs in the wild alongside a long-snouted look-a-like Brochis condiscipulus. The Latin name of condiscipulus actually means schoolmate pertaining to the fact that they are together much of the time. You can see in the imge below the difference in the length of the snout, and of course this shows in the different lineages of both species. Hoplisoma oiapoquense is lineage 9 wheras Brochiscondiscipulus is lineage 8 sub clade 4.

 

Brochis condiscipulus

Brochis condiscipulus

 

They were imported into the U.K., as far as I know, about 1996. The top picture is the male, I think, as the females don't get very gravid looking or heavy before the spawning cycle, so sometimes you can make a mistake identifying them. I was lucky and picked up 2 males and 1 female from a well known outlet in the north of England in March 98 and housed them in a 17" x 15" x 15" tank. Every time that I appeared in the fishhouse they would scatter about the tank and so I decided to cover the top of the tank to cut down on the light.

About 1 month later, with the tank being in darkness most of the time, I did not notice that they had spawned, with about 12 eggs laid on the Java Moss.  I had missed the first spawning as the parents must have ate the fry, so I took the eggs out to a separate container. The eggs are a kind of rusty/orange colour and about 2mm in size.

There are a few variations of this species where there is no banding in the tail and some that have no black blotch in the dorsal.

Below is a small photo gallery of the breeding of Hoplisoma oiapoquense, just click on the thumbnail to get a larger image.

 

Picture of egg 2mm with grains of sand attached to it.

Picture of egg 2mm with grains of sand attached to it.
 
Three youngsters 10 weeks old. Three youngsters 10 weeks old.
Youngster at 10 weeks old. Youngster at 10 weeks old.


Remarks: Corydoras oiapoquensis is placed in Lineage 9, the "short-snouted" species with the designated type species: C. punctatus. A revision in the future would constitute the resurrection of the genus name Hoplisoma (Agassiz, 1846). *As of the latest revision (Dias et al 2024) Corydoras oiapoquensis has now been placed in Lineage 9 and has the new genus and specific name of Hoplisoma oiapoquense. Still found on some online sources as Corydoras oiapoquensis.

 

Common Name

Stripe Tailed Panda

Synonyms

None

Family

Callichthyidae

Subfamily

Corydoradinae

Distribution

South America: French Guiana; Cumuri Creek at left bank of Río Oiapoque upstream of first rapids of Grande Roche, southwest of village Oiapoque.

Size

Male: 5.0cm (2ins) Female: 5.5cm (2¼ins)

Temp.

23-25°C (73-77°F)

p.H.

6.0-7.2.

Characteristics

Dorsal 1/7; Anal 1/5; Head short and compact.

Colouration

Flesh coloured body. Dorsal fin with black blotch to base. Caudal fin with black blotch at the base with dark bands. Black band covering eyes. Adipse fin with a black marking to leading edge.

Aquarium Care & Compatibility

A tank setup would entail a soft substrate such as sand or a small gravel and a nice plant covering around the back and sides of the aquarium. If housed in a community tank a mixture of small South American characins or the smaller varieties of Asian Rasboras would suffice, as larger fishes would intimidate these shy Cory's, and would stop them eating and would be therefore detrimental to their overall health.

Reproduction

As stated above, the tank size, but a 18" x 12" x 12" would suffice. When they spawned the tank parameters were a temp.of 77f and a pH of 6.with a GH of 1. As mentioned before they are apt to eating very small fry, so it is advised to take the eggs away and introduce the fry back, if desired, at about 1 month old. They are quite an easy species to spawn and I was surprised that they did when the pH was on the low side. A very shy species and likes to hide in the tank, so give pots etc.for their comfort.

Diet

The usual fare for adult Corydoras, a good quality flake food, tablet food, frozen bloodworm and whiteworm used sparingly.The fry can be fed brine shrimp from a very early age and grow quick in the first month, then they are apt to slow down.

Etymology

oiapoquensis: Named for the Rio Oiapoque in French Guiana were this Corydoras gets its name from.

References

Alexandrou, Markos & Taylor, Martin. (2011). Evolution, ecology and taxonomy of the Corydoradinae revisited.
Angelica C Dias, Luiz F C Tencatt, Fabio F Roxo, Gabriel de Souza da Costa Silva, Sérgio A Santos, Marcelo R Britto, Martin I Taylor, Claudio Oliveira, Phylogenomic analyses in the complex Neotropical subfamily Corydoradinae (Siluriformes: Callichthyidae) with a new classification based on morphological and molecular data, Zoological Journal of the Linnean Society, 2024;, zlae053.
Burgess, W.E
. 1992. Colored Atlas of Miniature Catfish. Every Species of Corydoras, Brochis & Aspidoras. T.F.H. Publications, Inc. Neptune City, New Jersey (USA). 224 p.

Ian A. M. Fuller & Hans-Georg Evers 2011, Identifying Corydoradinae Catfish: Aspidoras-Brochis-Corydoras-Scleromystax-C-numbers & CW-numbers 141p. Ian Fuller Enterprises.

Photo Credits

Top: © Mark Goh
Bottom & thumbnails
: ©
Allan James @ ScotCat

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