Neatest hitch hiker in my tank yet

[Nano]

Just found a small clam(mussel?) of some sort on my sand bed... weird cause I dip everything I put in my tank... looks like your general run of the mill clam nothing special.. dang would have been cool if it was a mini croacea or something
here it is ---- anyone know what type it is? I am already sure its nothing that will grow to be a sexy clam lol, but a neat little find none the less