Derasa? Help me ID

[seapug]

The pic below shows three clams. I know the ones on the right are a maxima (front) and crocea (back), but not sure about the other one. I picked it up from an LFS where they had it labeled as a maxima, but I know that's not what it is. Definitely doesn't look like a crocea either. Has a smooth shell like a Derasa, but much different mantle than my other Derasa and others that I've seen. I've seen pics of derasa - gigas hybrids that look similar to this guy, but I'm not sure if that's right, either. Can anyone give me a positive ID? Thanks!

 

[skinz78]

looks like a derasa to me, can you get a better pic of the incurrent siphon? They are all awesome looking clams, how much did you have to pay?

 

[seapug]

Thanks. Labeled as Maxima Clam, $40. I know the name was wrong, hopefully the price was, too
.
Lights are off now so gonna be hard to get any better pics, but I can see in there pretty well still. What features do I need to look for on the incurrent siphon? At the right angle it definitely has the blue rim around the outside of the mantle that many derasas have (including my other one), but all the other derasas I've seen all have the fine lines/reticulation in the mantle. This one has more spots than lines.

 

[mbbuna]

yes its a derasa but the best way to ID clams is from the shell

http://www.clamsdirect.com/forum/viewtopic.php?t=1994

 

[skinz78]

giga's have a smoothe incurrent siphon and derasa's have a fringe. I have never seen a giga's / derasa hybrid so thats why I questioned the siphon hole, I couldn't tell if it had a fringe.

 

[seapug]

It has fringe and the shell looks very "derasa", so I'll go with that. Derasa it is. Either way, I dig it! Thanks for the help.