ID Elegans group cories

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MissNoodle
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ID Elegans group cories

Post by MissNoodle »

Got some cories sold as nanus, but to me they lack the black bar at the base of the dorsal that the photos of nanus here show.

Gotta get them home, will post photos of them during acclimation, but until then I'm curious whats the difference between these species?
Last edited by MissNoodle on Mon Oct 26, 2020 6:41 pm, edited 1 time in total.
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Re: Difference between elegans, Napoensis, nanus

Post by MissNoodle »

The fish.
20201026_120747.jpg
20201026_121111.jpg
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20201026_125717.jpg

Possibly bilineatus? They were sold as nanus but given how rare nanus are... lol
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Re: ID Elegans group cories

Post by bekateen »

Those look like slightly stressed Corydoras(ln5) elegans to me. Corydoras(ln5) nanus is from a remote area that is not routinely collected from, and Corydoras(ln5) bilineatus looks very different.

But ugh, ID'ing some of the elegans group can be challenging. It does look like one or more fish of yours might have a black blotch on the dorsal fin, so perhaps a very young Corydoras(ln5) napoensis should also be considered.

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Re: ID Elegans group cories

Post by MissNoodle »

bekateen wrote: Mon Oct 26, 2020 7:09 pm Those look like slightly stressed Corydoras(ln5) elegans to me. Corydoras(ln5) nanus is from a remote area that is not routinely collected from, and Corydoras(ln5) bilineatus looks very different.

But ugh, ID'ing some of the elegans group can be challenging. It does look like one or more fish of yours might have a black blotch on the dorsal fin, so perhaps a very young Corydoras(ln5) napoensis should also be considered.

Cheers, Eric
The whole group makes my head spin haha

Theyre small, all between 1.5-1.7" so far, but I dont factor size if I dont know the age, could be juveniles of a larger species for all I know based on size.

Was reading over on Scotcat too to see a variety of photos from there and here and there's so much variation.
But one thing that stood out is the yellow fins on the one with the black dorsal blotch.

The dorsal on the one is a big dark blotch, the other not as much.

Stressed yes because was just acclimating them to the new water as just got them home. I add them to a container and slowly add the tank water to the container over the course of 30-45 minutes to allow them to adapt reasonably. Then I pour them into a net and add them to their new tank, avoiding any water from the bag from going in my tanks. But acclimation is always gonna have paler fish, they take some time to colour fully. But in store they were very nice and dark.

Knowing how rare nanus are, I definitely doubt that identity haha, elegans or napoensis were my first thoughts, but some images of bilineatus were similar in some aspects too. What a complicated group of cories.
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Re: ID Elegans group cories

Post by bekateen »

Napoensis can have yellow fins.
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Re: ID Elegans group cories

Post by MissNoodle »

Alrighty so the blotchy ones with yellow fins are more likely napoensis. The other still good for elegans?
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Re: ID Elegans group cories

Post by bekateen »

Wait till they color up and grow some, then reshare pics please.

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Re: ID Elegans group cories

Post by MissNoodle »

bekateen wrote: Tue Oct 27, 2020 1:34 pm Wait till they color up and grow some, then reshare pics please.

Cheers, Eric
Okay! Sounds good!

Now question, what age do they develop male or female colours? Do they change from fry colour to their respective coloring or do they all look female until maturity?

I dont know much about this group for that, I just saw them at the store and they were just really cute and that was the end of that lol
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Re: ID Elegans group cories

Post by Karsten S. »

Hi,

you will never find C. nanus (Suriname) or C. bilineatus (Bolivia) in ordinary pet shops, if you ever should be so lucky to find them in specialised shops they should be very much more expensive than other Corydoras.
Both species are coming from countries from which there are no regular exports so there is basically no chance that they are imported accidentally. I know of one commercial import of C. nanus and none of C. bilineatus and in this case they did know that they are importing a very rare fish.
If those should be someday available from breeders I would expect that those will also know that these two species are rare and would rather first distribute them among other breeders and not give them to pet shops.

However, the colouration is definitely also not fitting to C. nanus.

Cheers,
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Re: ID Elegans group cories

Post by MissNoodle »

Karsten S. wrote: Wed Oct 28, 2020 11:23 pm Hi,

you will never find C. nanus (Suriname) or C. bilineatus (Bolivia) in ordinary pet shops, if you ever should be so lucky to find them in specialised shops they should be very much more expensive than other Corydoras.
Both species are coming from countries from which there are no regular exports so there is basically no chance that they are imported accidentally. I know of one commercial import of C. nanus and none of C. bilineatus and in this case they did know that they are importing a very rare fish.
If those should be someday available from breeders I would expect that those will also know that these two species are rare and would rather first distribute them among other breeders and not give them to pet shops.

However, the colouration is definitely also not fitting to C. nanus.

Cheers,
I figured as much about the nanus, always a grain of salt. I dont trust their identifications. They labeled their pandas as wotroi, enough said haha. Ah I bought some expensive pandas that day, but hey they were cute and not many shops in my area even sells pandas anymore.

But I digress.

I figured more likely in the elegans type as they all look so close to one another.

Couple more photos
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Re: ID Elegans group cories

Post by MissNoodle »

bekateen wrote: Tue Oct 27, 2020 1:34 pm Wait till they color up and grow some, then reshare pics please.

Cheers, Eric
Added some newer photos, stronger colour.
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See above comment too theres more there
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Re: ID Elegans group cories

Post by MissNoodle »

Well if napoensis is the one that has the black blotch in the dorsal, im thinking all mine are napoensis as now fully colored up, they all have the dark thick blotch.
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Re: ID Elegans group cories

Post by bekateen »

Except for possibly the top photo in your last post, I don't see any C. napoensis there.

This group (lineage 5) is a tough group to ID sometimes

Cheers, Eric
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Re: ID Elegans group cories

Post by MissNoodle »

bekateen wrote: Sat Oct 31, 2020 7:15 pm Except for possibly the top photo in your last post, I don't see any C. napoensis there.

This group (lineage 5) is a tough group to ID sometimes

Cheers, Eric
What are some good clues to look for between all of the species? And which are the most common to come across?
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Re: ID Elegans group cories

Post by MissNoodle »

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These guys are stinking cute. I love how dainty their faces are compared to other cories. Its like they tried to be pygmies lol
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Re: ID Elegans group cories

Post by Jools »

MissNoodle wrote: Sat Nov 21, 2020 9:04 amIts like they tried to be pygmies lol
There's some truth in that. Fishes, generally, evolve into smaller species, and when you look at the faces of Corydoras you can begin to see how they split out into different lineages. The one that this is most obvious in (for me) is Corydoras nijsseni it's halfway between. It used to be considered a subspecies of C. elegans BTW.

Jools
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