Mystery bug

[Gorm]

After the recent red bug talk, I am more paranoid now than ever about what is alive in my tank.

I recently noticed a "new" resident in my tank. I know someone out there has to know what it is so I will give it a shot. After much searching on the internet to no avail, here it is

At first I thought it was a flat worm, but after close observation, it is a Crustacean of some sort. It is an excellent swimmer, doesn't like light, and seems to eat algae. The places where I see it after some time after lights out, is on the glass where I don't scrape. It's oval in shape, and pretty flat, and has several pairs of legs. Light color similar to my sand. The dark spot in the picture appears to be a stomach of some sort, visible from the underside when it is on the glass. Sorry for the picture quality, my camera doesn't do macro well.

 

[bookfish]

Are the legs actually articulated? The description otherwise fits a baby abalone which would have "frills" or "antenna" looking extensions around the shell margin.-Jim

 

[Gorm]

yes they are articulated, and are on the underside of the body. Theyremind me of a horseshoe crab without the tail, a little