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I have a group of 5 Corys, they were sold to me as Corydoras adolfoi. After a short while I started to wonder if they might be C. duplicareus instead. But then they started to spawn, and as the months passed by and the offspring grew up I'm convinced they are Adolfois after all.
The young clearly looks a lot more like Adolfoi than their parents do in my opinion, because the adults have a broader black stripe on the back than the usual Adolfoi. But again, Adolfoi is known to show great variety in that matter regarding the widt of the black colouration. And it sure looks like they are producing Adolfoi offspring anyway..!?

I'm posting some pictures here, some of the adults, and one of their offspring.

I need as many opinions as possible, because it drives me crazy not to know for sure what I have
I must know for certain what they are!


Please help! Thanks:)

The juvenile is about 5 months old, I have about 20 all together and some of them are close to 7 months.


And here are some of the adults:
<img src="http://nettakvariet.no/forum/attachment ... =115590986">


<img src="http://nettakvariet.no/forum/attachment ... 1155044755">

I have some C. duplicareus that have produced quite number of fry, and they all dispaly a much more pronounced black stripe than your fry. Im with you on the C. adolfoi-ID.

*BUMP*

Anyone..?
Hope to get some more opinions on this:)
Appreaciate all the helt I can get. Thanks:-)

These two species are not always that easy to differentiate between by colour pattern alone. In C. duplicareus the black strip tends to be broader, the body slightly deeper, the snout sounder, but the one feature that will separate them is the rear edge of the pectoral fin spine is serrated, in C. adolfoi it is smooth.

The pictures below are both of females.

Ian

C. adolfoi


C. duplicareus

Thank you so much, Ian!
Now I feel completely sure what species they are. I've been studying them very, very closely the last few days, and their pectoral fins are as smooth as can be:-) That means they are C. adolfoi after all, just as I thought.

The rear edge of the pectoral fin spine is NOT serrated on my fish. It's a smooth, clean, straight edge.

Thanks again, I'm very happy that this problem is finally solved.