PlanetCatfish.com

Through some miracle of fate, I've ended up with about 10 fry from different species. They're getting old enough so that they're starting to look like cory instead of sperm, but since they're different species, is there a resource that can show me what they might be?

There is an excellent resource: Ian Fuller's book on Breeding Corydoradinae Catfish, and his website Corydoras World www.corydorasworld.com. He has spawned most Corydoras and has produced line drawings and photographs of the different fry growth stages.

Is there a site that doesn't cost me anything?

There are quite a few juvenile photos in our Cat-eLog [cog]Corydoras[/clog]. Try using the "Image Captions" and search for "Juvenile" - the list comes out sorted in groups, so you can quite easily find the juveniles.

However, since you don't sell them before they colour out properly, I'd expect that you can just "wait and see". Care for young cory's is the same no matter what species they are.

Alternatively, take photos and post here. If you also give a list of what you are keeping, I'm pretty sure that some of the better Cory keepers can help out with narrowing down the field - maybe not all the way down to "It's 100% sure this", but at least "This one is one of these two".

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Mats

Here's one I took a few minutes ago. It's 10 days old, and about 3/4" long already, which makes me lean toward thinking it's a delphax. The other fry in the tank (save for one just like this one) are all much smaller, even though they're 13 days old.

I think maybe you will have to wait a while for the fry to develop their adult markings. Around 6-7 weeks, I guess, they will reveal their true identity.
Before that age, there isn't many Corydoras fry that we're able to identify for sure. Most of them, with a few exceptions, will all look pretty much the same with nice camoflage markings.
Corydoras rabauti and C. zygatus are fry the only ones I can remember just now, that are easily identified before they get their adult markings and colours.