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Have had all these fish for quite a while and never really known exactly what they are, just educated guesses!! However, buying Ian's ID book from him has inspired to find out once and for all.

Can you confirm my initial ID's please?
Thanks to Corydoras World for hosting the pictures.

They all seem to be adult size, around 5-6 cm.

1)Corydoras ambiacus?
(The one that's swimming and the one to the left of it)



2) C131?



(Also see picture 1 for reticulated head patterning)

3) Corydoras agassizii?





4) Corydoras leopardus? trilineatus?

The one in front of my second favourite cory, c gossei (after c seussi)



5) Corydoras griseus? C40? C73?



Thanks for your help!!

1: C. delphax I think.
2: C-131 I think.
3: Yes, it could be a C. agassizi
4: I'd say C. trilineatus
5: Can't remember the differences...

Hope it helps you a bit...

Thanks

I don't think Number 1 is c delphax as I have these and they look nothing like.



The C131 is behind and above the delphax

hi xsu xsu

good photos makes it alot easier
1. is C.ambiacus definatly
2.is also C.ambiacus the marking in the dorsal fin does'nt reach into the body on C131
3.most likely C.agassizii the black in the dorsal fin covers the spine in ambiacus it does'nt
4.C.102 similar to leopardus
5.C.40 as griseus and C.73 don't have the gold marking
hopr this helps

stuart

These similarities are so tricky!!

I'm convinced that 1 and 2 are different. The dorsal spot is in a completely different position. In 2 it is in the same position as for c. trilineatus, in 1 it just about comes into the dorsal from the body.
Also, and more obviously, 2 has a heavily reticulated head pattern which is absent from 1. The difference can be seen in the first photo which contains species 1 and 2.

xsu-xsu

Picture 1 =
Centre fish = C. delphax
left of centre = possibly C131 or even a colour variant of C. leopardus.
The one to right of centre is impossible to tell.

picture 2
= C131

Pictures 3/4
= My choice is C. ambiacus, C. ambiacus and C. agazissii are very closely related and their colour patterns overlap, which make exact identification of either species without capture locality details almost impossible.

Pictures 5
= I would say is C102 (C. cf leopardus)

Picture 6
= Is possibly C73 but again without catching locality details it is impossible to make an accurate ID.

And in the picture in your following post the upper fish is not C131 but more like C102 or even a colour variant of C. leopardus.

With regard to C131 there are two patterns involved with specimens from single populations, both fish have almost the same body markings, but there are two distinctly different dorsal blotch shapes one is ovate and is almost central within the fin and the other is an irregular rectangular shape which favours more to the front of the fin excluding the spine. To try and help with Cory ID problems I along with Hans-Georg Evers produced this. ID book

Sorry for the book plug

Ian

I got your book this morning Ian, even signed by you!!!
Thanks for sending it so quickly!!

The reason why I have questioned some of my initial thoughts are due to the similarities mentioned in the Remarks sections.

Btw, the fish to left of centre in picture 1 and the fish in picture 2 are the same fish. I'll take it as C131 in both cases then!!

Is it then true that the fish in the centre of picture 1 is a semi-adult delphax and that the spots will disappear in full adulthood? I have c. delphax that look identical to the one in your book and there are no body spots, whereas fish 1 has.

The pic with the c. delphax, yes sorry, it is the same species (maybe even the same fish) as in picture 5, not C131.