Cory burgessi, C121 or something else?

[Mol_PMB]

Any thoughts on the ID of these?
Currently on sale at Aqualife Leyland, UK.
They’re advertised as Cory
burgessi. But I keep and breed burgessi and none of mine gave the clear patch by the gills - that’s a trait of C121.
Thanks,
Paul

[Mol_PMB]

Sorry, here are the pics:

[Karsten S.]

Hi,

typical C 121 have the pattern of C. adolfoi, these have rather the pattern of C. burgessi.
Therefore I'm reluctant to call these also C 121. Possibly a new CW number would be better.
It would be interesting to know from breeders how variable is the offspring of C 121 with respect to pattern and the transparent gill cover.

Cheers,

[Mol_PMB]

Thanks Karsten, and I agree with your thoughts. I hope Ian Fuller doesn't mind me quoting one paragraph from Corydorasworld abou C121:
"The transparent scute behind the operculum is unique amongst Corydoradinae. Offspring up to 15 mm SL do not show this transparency. Some populations of F1's are producing offspring that do not show the clear patch at all."

However, all the photos I have seen labelled C121 do have the black line along the back, like C.adolfoi.

On the other hand, these fish have the colour pattern like C.burgessi, without the black line but with a dark blotch below the dorsal fin. But they have the transparent scute like C121.

There were a few other 'normal' C.burgessi in the same tank, the fish were of similar size but I don't know if they came from the same source.

[bekateen]

I agree that this fish looks different. When I first saw it, the black spot reminded me of

CW051

. Nothing else about the fish looks correct, but the black blotch stands out in the way it curves gently down low onto the body flank, without extending posteriorly along the dorsal body margin. The latter look, as seen in Corydoras duplicareus and adolfoi) makes me think of a a blanket that has been draped over the back of a couch. I call it the "blanket look:"



Cheers, Eric

[bekateen]

I agree that this fish looks different. When I first saw it, the black spot reminded me of

CW051

. Nothing else about the fish looks correct, but the black blotch stands out in the way it curves gently down low onto the body flank, without extending posteriorly along the dorsal body margin. The latter look, as seen in

Corydoras duplicareus

and

Corydoras adolfoi

, makes me think of a a blanket that has been draped over the back of a couch. I call it the "blanket look:"



Cheers, Eric

[Mol_PMB]

Thanks Eric,
I’m wondering if I shpuld go back to the shop tomorrow and get some. Only trouble is I’m a bit short of tank space and don’t want to mix them with my normal burgessi (currently occupying 3 tanks and another spawn about to hatch!)