Odd shaped Clam

[rock-n-reef]

Picked up this Derasa (i think so) over the weekend from All things aquatics.

First I thought, some fish took a bite out of this clam . But then realized that he has an odd growth pattern. Probably a wild specimen with one of the lateral end that grew over some flat rock surface. The section after the Inhalant Siphon looks as though is chopped, but in fact the shell has grown flat. You will see the flat surface in the second picture.

btw, based on the mantle I'm not able to say whether this is Derasa or a Gigas. Any thoughts?

This is how he would look, if I tried to keep him on his foot (btw, he doesn't have any visible byssal opening!)

 

[this is me]

It's a Hippopus Hippopus.

https://www.liveaquaria.com/product/6876/?pcatid=6876

 

[rock-n-reef]

It's a Hippopus Hippopus.

https://www.liveaquaria.com/product/6876/?pcatid=6876

Looks like it, except for the tentacles on the inhalant siphon.
Which is not supposed to be present in H. Hippopus.

 

[this is me]

It’s a hippo. 100%.

 

[rock-n-reef]

It’s a hippo. 100%.

Cool! Thank you!

 

[this is me]

Lol. I spent a lot of time looking at clams and have kept every species of clam(except for the hippo) and I believe that is a hippo. https://reefbuilders.com/2017/01/19/hippopus-porcellanus/

 

[PThanh1968]

Agree, it’s hippo. I have twin, a good deal from Petco 2 for price of 1

 

[PSU4ME]

Nick’s a big clam fan

 

[rock-n-reef]

Lol. I spent a lot of time looking at clams and have kept every species of clam(except for the hippo) and I believe that is a hippo. https://reefbuilders.com/2017/01/19/hippopus-porcellanus/

Nice! Based on the 3rd picture in the article (side by side comparison of shell between H. hippopus and porcellanus), this should be a H. Hippopus. The red "ridges" are definitely visible!

 

[dz6t]

Yes it is a H. Hippopus. I have a bunch of them as water filter.