What is this? Found ay Karachi beach, off Arabian Sea

Posted by legspinner1004@reddit | marinebiology | View on Reddit | 5 comments

I ha w found many shells and have been able to identify mosr of them. This is the first one of it's kind that I have found. I thought it could be some sort of mussel but the shell seems to be too thin compared to mussels found here (mostly Perna spp). Any help would be appreciated. Thanks.