Can we examine the photos of C. agassizii and C. ambiacus for confusion?
Posted: 22 Jul 2015, 19:08
Hi Jools,
In a recent forum thread on CorydorasWorld.com (http://www.corydorasworld.com/forum/?forum=9&post=245, if you are a member and have access to their forums), it came to my attention from Ian that should have the dorsal fin black coloration extend all the way to the edge of the fin, but in the coloration does not. According to Ian, this is the single-most reliable trait for distinguishing these two species from one another. However, the photos of these species, as displayed on PC, seem to show a mix of this trait for both species.
Specifically, I'm looking at images #9 and #14 of ambiacus, which appear to have the agassizii-style dorsal coloration, and images #1, 2, 3, 4, 5, 8, 13, (and maybe #10 and #12, but these are far more "iffy") of agassizii, which seem to have the smaller spots of ambiacus.
I realize that some of this may be due to age/maturity, or individual variation, but is it possible for someone with authority and who is familiar with the sources of these photos to review the photos and make sure that they are properly assigned to the right species? Although I've singled out specific photos above, I would suggest that in the interest of thoroughness, all of the photos should be reviewed at once, not just the photos I mentioned above.
Thanks. Cheers,
Eric
In a recent forum thread on CorydorasWorld.com (http://www.corydorasworld.com/forum/?forum=9&post=245, if you are a member and have access to their forums), it came to my attention from Ian that should have the dorsal fin black coloration extend all the way to the edge of the fin, but in the coloration does not. According to Ian, this is the single-most reliable trait for distinguishing these two species from one another. However, the photos of these species, as displayed on PC, seem to show a mix of this trait for both species.
Specifically, I'm looking at images #9 and #14 of ambiacus, which appear to have the agassizii-style dorsal coloration, and images #1, 2, 3, 4, 5, 8, 13, (and maybe #10 and #12, but these are far more "iffy") of agassizii, which seem to have the smaller spots of ambiacus.
I realize that some of this may be due to age/maturity, or individual variation, but is it possible for someone with authority and who is familiar with the sources of these photos to review the photos and make sure that they are properly assigned to the right species? Although I've singled out specific photos above, I would suggest that in the interest of thoroughness, all of the photos should be reviewed at once, not just the photos I mentioned above.
Thanks. Cheers,
Eric